{"id":3560,"date":"2025-11-20T08:48:10","date_gmt":"2025-11-20T08:48:10","guid":{"rendered":"https:\/\/www.markus-schall.de\/?p=3560"},"modified":"2025-12-08T15:34:18","modified_gmt":"2025-12-08T15:34:18","slug":"the-silent-danger-of-wearables-when-convenience-becomes-surveillance","status":"publish","type":"post","link":"https:\/\/www.markus-schall.de\/en\/2025\/11\/the-silent-danger-of-wearables-when-convenience-becomes-surveillance\/","title":{"rendered":"The silent danger of wearables: when convenience becomes surveillance"},"content":{"rendered":"<p>Wearables are now part of everyday life. Many people now wear a smartwatch as a matter of course, count their steps, monitor the quality of their sleep or set reminders to take breaks during the day. And I'm happy to admit it: I also have a Apple Watch myself, and I find this technology absolutely fascinating in its own way. It can do things that would have been pure dreams of the future just a few years ago. Nevertheless, I rarely use my Apple Watch.<\/p>\n<p>And just now, after the latest reports and statements from experts, I realize once again that this reticence is not so wrong. After all, many modern headphones and wearables now contain sensors that can measure far more than you might think at first glance. Not all headphones do - but the trend is clear: more and more technology is moving inconspicuously into small devices that we wear close to our bodies.<!--more--><\/p>\n<p>The first part is intended to explain quite simply what <a href=\"https:\/\/www.bsi.bund.de\/EN\/Themen\/Verbraucherinnen-und-Verbraucher\/Informationen-und-Empfehlungen\/Internet-der-Dinge-Smart-leben\/Smart-Home\/Wearables\/wearables_node.html\" target=\"_blank\" rel=\"noopener\"><strong>Wearables<\/strong><\/a> today, why they are useful for many people - and why you should still take a closer look before blindly relying on them.<\/p>\n<hr \/>\n\n\t\t\t<div class=\"display-post-types\">\n\n\t\t\t\t\t\t\t<style type=\"text\/css\">\n\t\t\t#dpt-wrapper-90 { --dpt-text-align: left;--dpt-image-crop: center;--dpt-border-radius: 5px;--dpt-h-gutter: 10px;--dpt-v-gutter: 9px; }\t\t\t<\/style>\n\t\t\t<style type=\"text\/css\">#dpt-wrapper-90 { --dpt-title-font-style:normal;--dpt-title-font-weight:600;--dpt-title-line-height:1.5;--dpt-title-text-decoration:none;--dpt-title-text-transform:none;--dpt-excerpt-font-style:normal;--dpt-excerpt-font-weight:400;--dpt-excerpt-line-height:1.5;--dpt-excerpt-text-decoration:none;--dpt-excerpt-text-transform:none;--dpt-meta1-font-style:normal;--dpt-meta1-font-weight:400;--dpt-meta1-line-height:1.9;--dpt-meta1-text-decoration:none;--dpt-meta1-text-transform:none;--dpt-meta2-font-style:normal;--dpt-meta2-font-weight:400;--dpt-meta2-line-height:1.9;--dpt-meta2-text-decoration:none;--dpt-meta2-text-transform:none; }<\/style><div class=\"dpt-main-header\">\n\t\t\t\t\t\t<div class=\"dpt-main-title\">\n\t\t\t\t\t\t\t<span class=\"dpt-main-title-text\">Social issues of the present<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t<\/div>\t\t\t\n\t\t\t\t<div id=\"dpt-wrapper-90\" class=\"dpt-wrapper dpt-mag1 land1 dpt-cropped dpt-flex-wrap\" >\n\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"dpt-entry has-thumbnail\" data-title=\"warum dieter bohlen spricht, wenn andere schweigen: ein portr\u00e4t \u00fcber flei\u00df und klarheit\" data-id=\"3744\"  data-category=\"allgemein gesellschaft kunst &amp; kultur\" data-post_tag=\"auswandern deutschland erfahrungen krisen meinungsfreiheit musik portrait\">\n\t\t\t\t\t\t\t<div class=\"dpt-entry-wrapper\"><div class=\"dpt-featured-content\"><div class=\"dpt-permalink\"><a href=\"https:\/\/www.markus-schall.de\/en\/2025\/12\/why-dieter-bohlen-speaks-when-others-remain-silent-a-portrait-of-diligence-and-clarity\/\" class=\"dpt-permalink\"><span class=\"screen-reader-text\">Why Dieter Bohlen speaks when others remain silent: A portrait of diligence and clarity<\/span><\/a><\/div><div class=\"dpt-thumbnail\"><div class=\"dpt-thumbnail-inner\"><img width=\"1024\" height=\"683\" class=\"attachment-full size-full\" alt=\"\" context=\"dpt\" data-dpt-src=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/Dieter-Bohlen-Portrait.jpg\" data-dpt-sizes=\"(max-width: 1024px) 100vw, 1024px\" data-dpt-srcset=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/Dieter-Bohlen-Portrait.jpg 1024w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/Dieter-Bohlen-Portrait-300x200.jpg 300w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/Dieter-Bohlen-Portrait-768x512.jpg 768w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/Dieter-Bohlen-Portrait-18x12.jpg 18w\" \/><\/div><span class=\"dpt-thumbnail-aspect-ratio\" style=\"padding-top: 75%\"><\/span><\/div><\/div><div class=\"sub-entry\"><h3 class=\"dpt-title\"><a class=\"dpt-title-link\" href=\"https:\/\/www.markus-schall.de\/en\/2025\/12\/why-dieter-bohlen-speaks-when-others-remain-silent-a-portrait-of-diligence-and-clarity\/\" rel=\"bookmark\">Why Dieter Bohlen speaks when others remain silent: A portrait of diligence and clarity<\/a><\/h3><\/div><\/div>\n\t\t\t\t\t\t<\/div><!-- .dpt-entry -->\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"dpt-entry has-thumbnail\" data-title=\"hohe energiepreise in deutschland verstehen: gas, strom und benzin einfach erkl\u00e4rt\" data-id=\"4103\"  data-category=\"allgemein gesellschaft tipps &amp; anleitungen\" data-post_tag=\"deutschland energiepolitik eu-gesetze europa krisen ratgeber\">\n\t\t\t\t\t\t\t<div class=\"dpt-entry-wrapper\"><div class=\"dpt-featured-content\"><div class=\"dpt-permalink\"><a href=\"https:\/\/www.markus-schall.de\/en\/2025\/12\/understanding-high-energy-prices-in-germany-gas-electricity-and-gasoline-simply-explained\/\" class=\"dpt-permalink\"><span class=\"screen-reader-text\">Understanding high energy prices in Germany: Gas, electricity and gasoline explained simply<\/span><\/a><\/div><div class=\"dpt-thumbnail\"><div class=\"dpt-thumbnail-inner\"><img width=\"1024\" height=\"683\" class=\"attachment-full size-full\" alt=\"Energy prices in Germany\" context=\"dpt\" data-dpt-src=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/energiepreise-deutschland.jpg\" data-dpt-sizes=\"(max-width: 1024px) 100vw, 1024px\" data-dpt-srcset=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/energiepreise-deutschland.jpg 1024w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/energiepreise-deutschland-300x200.jpg 300w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/energiepreise-deutschland-768x512.jpg 768w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/energiepreise-deutschland-18x12.jpg 18w\" \/><\/div><span class=\"dpt-thumbnail-aspect-ratio\" style=\"padding-top: 75%\"><\/span><\/div><\/div><div class=\"sub-entry\"><h3 class=\"dpt-title\"><a class=\"dpt-title-link\" href=\"https:\/\/www.markus-schall.de\/en\/2025\/12\/understanding-high-energy-prices-in-germany-gas-electricity-and-gasoline-simply-explained\/\" rel=\"bookmark\">Understanding high energy prices in Germany: Gas, electricity and gasoline explained simply<\/a><\/h3><\/div><\/div>\n\t\t\t\t\t\t<\/div><!-- .dpt-entry -->\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"dpt-entry has-thumbnail\" data-title=\"wie ich in vier monaten f\u00fcnf b\u00fccher in zwei sprachen geschrieben habe\" data-id=\"2775\"  data-category=\"allgemein b\u00fccher gesellschaft tipps &amp; anleitungen\" data-post_tag=\"buch digitales eigentum lernen prozesse publishing verlag\">\n\t\t\t\t\t\t\t<div class=\"dpt-entry-wrapper\"><div class=\"dpt-featured-content\"><div class=\"dpt-permalink\"><a href=\"https:\/\/www.markus-schall.de\/en\/2025\/09\/how-i-wrote-five-books-in-two-languages-in-four-months\/\" class=\"dpt-permalink\"><span class=\"screen-reader-text\">How I wrote five books in two languages in four months<\/span><\/a><\/div><div class=\"dpt-thumbnail\"><div class=\"dpt-thumbnail-inner\"><img width=\"1920\" height=\"1280\" class=\"attachment-full size-full\" alt=\"Writing books with Affinity and BoD\" context=\"dpt\" data-dpt-src=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/buecher-affinity-bod-selfpublishing.jpg\" data-dpt-sizes=\"(max-width: 1920px) 100vw, 1920px\" data-dpt-srcset=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/buecher-affinity-bod-selfpublishing.jpg 1920w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/buecher-affinity-bod-selfpublishing-300x200.jpg 300w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/buecher-affinity-bod-selfpublishing-1024x683.jpg 1024w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/buecher-affinity-bod-selfpublishing-768x512.jpg 768w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/buecher-affinity-bod-selfpublishing-1536x1024.jpg 1536w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/buecher-affinity-bod-selfpublishing-18x12.jpg 18w\" \/><\/div><span class=\"dpt-thumbnail-aspect-ratio\" style=\"padding-top: 75%\"><\/span><\/div><\/div><div class=\"sub-entry\"><h3 class=\"dpt-title\"><a class=\"dpt-title-link\" href=\"https:\/\/www.markus-schall.de\/en\/2025\/09\/how-i-wrote-five-books-in-two-languages-in-four-months\/\" rel=\"bookmark\">How I wrote five books in two languages in four months<\/a><\/h3><\/div><\/div>\n\t\t\t\t\t\t<\/div><!-- .dpt-entry -->\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"dpt-entry has-thumbnail\" data-title=\"propaganda: geschichte, methoden, moderne formen und wie man sie erkennt\" data-id=\"4229\"  data-category=\"allgemein gesellschaft kunst &amp; kultur\" data-post_tag=\"denkmodelle energiepolitik europa geopolitik krisen meinungsfreiheit pers\u00f6nlichkeitsentwicklung sicherheitspolitik spieltheorie\">\n\t\t\t\t\t\t\t<div class=\"dpt-entry-wrapper\"><div class=\"dpt-featured-content\"><div class=\"dpt-permalink\"><a href=\"https:\/\/www.markus-schall.de\/en\/2026\/01\/propaganda-history-methods-modern-forms-and-how-to-recognize-them\/\" class=\"dpt-permalink\"><span class=\"screen-reader-text\">Propaganda: history, methods, modern forms and how to recognize them<\/span><\/a><\/div><div class=\"dpt-thumbnail\"><div class=\"dpt-thumbnail-inner\"><img width=\"1024\" height=\"683\" class=\"attachment-full size-full\" alt=\"What is propaganda?\" context=\"dpt\" data-dpt-src=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/Propaganda-titel.jpg\" data-dpt-sizes=\"(max-width: 1024px) 100vw, 1024px\" data-dpt-srcset=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/Propaganda-titel.jpg 1024w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/Propaganda-titel-300x200.jpg 300w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/Propaganda-titel-768x512.jpg 768w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/Propaganda-titel-18x12.jpg 18w\" \/><\/div><span class=\"dpt-thumbnail-aspect-ratio\" style=\"padding-top: 75%\"><\/span><\/div><\/div><div class=\"sub-entry\"><h3 class=\"dpt-title\"><a class=\"dpt-title-link\" href=\"https:\/\/www.markus-schall.de\/en\/2026\/01\/propaganda-history-methods-modern-forms-and-how-to-recognize-them\/\" rel=\"bookmark\">Propaganda: history, methods, modern forms and how to recognize them<\/a><\/h3><\/div><\/div>\n\t\t\t\t\t\t<\/div><!-- .dpt-entry -->\n\t\t\t\t\t\t\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\n<hr \/>\n<h2>What modern wearables can do today<\/h2>\n<p>To put it simply, wearables are small computers that you wear on your body. The best-known form is the smartwatch - whether from Apple, Samsung or Garmin. There are also fitness wristbands, chest straps, rings such as the Oura ring and, of course, in-ear headphones that do more than just play music. Most people are familiar with the basic functions:<\/p>\n<ul>\n<li>Count steps<\/li>\n<li>Estimate calories<\/li>\n<li>Measure movement<\/li>\n<li>Record heart rate<\/li>\n<li>Monitor sleep<\/li>\n<li>Analyze trainings<\/li>\n<\/ul>\n<p>They are practical helpers that collect data without any effort and turn it into useful information. For many people, this is motivating - you can see at a glance whether you have moved enough, how you have slept or whether you need more breaks.<\/p>\n<h3>Why the devices have become so popular<\/h3>\n<p>There are several reasons for the success of these little gizmos. Firstly, they make many things visible that were previously only felt. Secondly, they are convenient. You don't have to write anything down, measure anything or plan anything - the watch takes care of it all. Thirdly, they give you the feeling that you have your life under control. Movement, sleep, heartbeat - everything can suddenly be tracked.<\/p>\n<p>And last but not least, they look modern. Manufacturers naturally do everything they can to reinforce this impression: new colors, new straps, new functions. The principle is always the same:<\/p>\n<blockquote><p><em>\u201eCarry us - and you are part of the progress.\u201c<\/em><\/p><\/blockquote>\n<h3>The justified advantages of wearables<\/h3>\n<p>Despite all caution, you should remain fair. Many wearables have real advantages:<\/p>\n<ul>\n<li>You can recognize abnormal heart rhythms.<\/li>\n<li>They warn of unusual loads.<\/li>\n<li>They motivate you to go for a walk or do sport.<\/li>\n<li>They remind you to take breaks if you sit for too long.<\/li>\n<li>They record sleep phases so that you can better understand your own patterns.<\/li>\n<li>In an emergency, they can even call for help automatically.<\/li>\n<\/ul>\n<p>It would therefore be wrong to pretend that the technology is fundamentally bad. In the past, you had to go to a sleep laboratory or a cardiologist for such measurements. Today, this technology - at least in a simplified form - is available directly on the wrist.<\/p>\n<p>This is precisely why it is important to approach the topic with a clear head. Technology can be useful. It can make life easier. But you should always be aware of the price you pay for it - and that's not always just money.<\/p>\n<h2>What data are measured by wearables?<\/h2>\n<p>The first part was about the visible advantages and the fascination of these small devices. But that's just the surface. Now we come to the part that hardly anyone really understands: What wearables measure in the background. Most users believe that their watch only counts steps and shows their pulse. But modern sensors go much deeper. They record signals that would previously only have been measured in medical or psychophysiological laboratories. And these signals can be used to draw conclusions that go far beyond \u201eI walked a lot today\u201c.<\/p>\n<p>This is where it gets exciting - and sometimes a little scary. Because many of these measurements are completely automatic and invisible to the user.<\/p>\n<h3>The visible data: What everyone knows<\/h3>\n<p>Before we get to the hidden sensors, let's start with what everyone can see. After all, this obvious data is the selling point.<\/p>\n<ul>\n<li><strong>Steps and movement<\/strong>: This is simple movement data. The watch recognizes how often and how much the wrist moves. This is used to calculate steps, minutes of activity and calories.<\/li>\n<li><strong>Heart rate (pulse)<\/strong>This is the central function. The optical sensors use changes in light to measure how quickly the blood pulsates in the wrist. This is unproblematic and relatively rough - but helpful.<\/li>\n<li><strong>Sleep tracking<\/strong>Many people think that the watch \u201erecognizes\u201c the sleep phases directly - but this is not true. It combines lack of exercise, pulse, breathing patterns and a few other values to produce an estimated value. Nevertheless, it provides surprisingly useful information.<\/li>\n<li><strong>Oxygen saturation (SpO\u2082)<\/strong>Sometimes quite accurate, sometimes more of a gimmick - but it works as long as you lie still.<\/li>\n<\/ul>\n<p>Everything that has been mentioned so far is basically harmless. The public is aware of these values, they are advertised and you can decide whether you want to have them measured. But that's just the tip of the iceberg.<\/p>\n<h3>The invisible biosignals: what hardly anyone notices<\/h3>\n<p>Now we come to the crucial point. Modern wearables - especially smartwatches and in-ear headphones - record biosignals that go far beyond what the user consciously sees. This happens quietly, automatically and in the background. And it is precisely this data that allows conclusions to be drawn about mood, stress, emotional state or even basic character. I will go through the most important invisible measurement methods in turn:<\/p>\n<p><strong>Heart rate variability (HRV)<\/strong><\/p>\n<p>You sometimes see this number in apps, but many people don't even know what it means. HRV measures how irregularly the heart beats. A healthy heart does NOT beat like a metronome - it beats irregularly. The more irregular (within a healthy range), the more relaxed the body is.<\/p>\n<ul>\n<li>low HRV \u2192 stress, strain, fatigue<\/li>\n<li>high HRV \u2192 relaxation, regeneration, strong performance<\/li>\n<\/ul>\n<p>Wearables constantly measure HRV, often without the user realizing it. Why is this important? Because HRV is the most reliable everyday indicator for:<\/p>\n<ul>\n<li>Stress level<\/li>\n<li>Mental tension<\/li>\n<li>Burnout risk<\/li>\n<li>emotional arousal<\/li>\n<li>Exasperation<\/li>\n<li>Nervousness<\/li>\n<li>Physical exhaustion<\/li>\n<\/ul>\n<p>Emotions can therefore be recognized without the user knowing about it.<\/p>\n<p><strong>Micro-changes in skin conductivity<\/strong><\/p>\n<p>Many modern sensors can use tiny voltage changes to measure how \u201econductive\u201c the skin currently is. This is basically the same measurement method as the lie detector.<\/p>\n<ul>\n<li>More sweat \u2192 higher conductivity \u2192 stress\/excitation<\/li>\n<li>Less sweat \u2192 lower conductivity \u2192 rest<\/li>\n<\/ul>\n<p>These values can be recorded by headphones, ear sensors, smartwatches and fitness wristbands - without any active intervention.<\/p>\n<p><strong>Ear blood flow and tissue signals (with in-ear headphones)<\/strong><\/p>\n<p>This is the part that many people don't even think about. The ear canal is an ideal place to measure:<\/p>\n<ul>\n<li>Very good blood circulation<\/li>\n<li>Stable temperature<\/li>\n<li>hardly any movement disorders<\/li>\n<\/ul>\n<p>Skin is thin and well suited for light measurement. This is why some in-ear wearables can already:<\/p>\n<ul>\n<li>Circulation pattern<\/li>\n<li>Stress reactions<\/li>\n<li>Breathing rhythm<\/li>\n<li>sympathetic activity (fight\/flight mode)<\/li>\n<\/ul>\n<p>and with astonishing accuracy. Many users have no idea that such sensors even exist.<\/p>\n<p><strong>Breathing patterns and micro-movements<\/strong><\/p>\n<p>The watch sees how the thorax moves - minimally, but measurably. Breathing can be deduced from this:<\/p>\n<ul>\n<li>Shallow, hectic breathing \u2192 Stress<\/li>\n<li>Deep, rhythmic breathing \u2192 Rest<\/li>\n<li>Irregular breathing \u2192 emotional reactions<\/li>\n<\/ul>\n<p>In combination with HRV, this gives a fairly clear picture of the nervous system.<\/p>\n<p><strong>EMG-Light: Mini muscle activity<\/strong><\/p>\n<p>Even without electrodes, small muscle twitches and tension patterns can be detected - for example on the forearm or behind the ear. This allows you to:<\/p>\n<ul>\n<li>Tension in the jaw<\/li>\n<li>unsteady movements<\/li>\n<li>Micro gestures<\/li>\n<li>subtle stress signals<\/li>\n<\/ul>\n<p>register.<\/p>\n<h3>Frequency patterns that allow conclusions to be drawn about the autonomic nervous system<\/h3>\n<p>Blood flow has frequencies. Breathing has frequencies. Micro-movements have frequencies. Electrical micro-reactions in the skin have frequencies. If you combine these patterns, you can:<\/p>\n<ul>\n<li>Recognize excitement \/ calmness<\/li>\n<li>Determine stress level<\/li>\n<li>derive basic emotional tendencies<\/li>\n<li>even classify personality tendencies<\/li>\n<\/ul>\n<p>And all without \u201emind reading\u201c.<\/p>\n<hr \/>\n<div class=\"lyte-wrapper\" style=\"width:640px;max-width:100%;margin:5px;\"><div class=\"lyMe\" id=\"WYL_M4Bj5TpF2ZU\"><div id=\"lyte_M4Bj5TpF2ZU\" data-src=\"https:\/\/www.markus-schall.de\/wp-content\/plugins\/wp-youtube-lyte\/lyteCache.php?origThumbUrl=%2F%2Fi.ytimg.com%2Fvi%2FM4Bj5TpF2ZU%2Fhqdefault.jpg\" class=\"pL\"><div class=\"tC\"><div class=\"tT\"><\/div><\/div><div class=\"play\"><\/div><div class=\"ctrl\"><div class=\"Lctrl\"><\/div><div class=\"Rctrl\"><\/div><\/div><\/div><noscript><a href=\"https:\/\/youtu.be\/M4Bj5TpF2ZU\" rel=\"nofollow noopener\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.markus-schall.de\/wp-content\/plugins\/wp-youtube-lyte\/lyteCache.php?origThumbUrl=https%3A%2F%2Fi.ytimg.com%2Fvi%2FM4Bj5TpF2ZU%2F0.jpg\" alt=\"YouTube video thumbnail\" width=\"640\" height=\"340\" \/><br \/>Watch this video on YouTube<\/a><\/noscript><\/div><\/div><div class=\"lL\" style=\"max-width:100%;width:640px;margin:5px;\"><\/div><br \/>\nIs Your Smartwatch Spying on You? We Analyzed 17 Privacy Policies to Find Out. (English)<\/p>\n<hr \/>\n<h3>What you can really deduce from this data<\/h3>\n<p>Many people completely underestimate this. They think: \u201eIt's just measuring my pulse\u201c. No. Complex patterns can be derived from the biosignals described above - patterns that previously only psychologists, neuroscientists or military researchers could read. Here are a few of the most important conclusions:<\/p>\n<ol>\n<li><strong>Stress and emotional situation<\/strong>Very precise, sometimes to the minute. You can recognize: anger, fear, exhaustion, excitement, surprise, joy or slow recovery. This works almost perfectly via HRV + breathing.<\/li>\n<li><strong>Daily patterns and habits<\/strong>After a few weeks, the watch knows you better than you know yourself: When you get tired, when you are most focused, when you are emotionally unstable or when you are most productive.<\/li>\n<li><strong>Risk of burnout, stress or depression<\/strong>Algorithms can derive incredible amounts from years of HRV curves. In the long term, patterns can be recognized such as: impulsive vs. controlled, calm vs. easily excitable, resilient vs. sensitive, stable vs. changeable and balanced vs. tense. This happens completely automatically. The user does not notice anything.<\/li>\n<li><strong>Psychological reactions to situations<\/strong>In conjunction with location data, systems know what stresses you out, what calms you down, which places upset you, which people make you nervous, how you react to messages or which times are emotionally sensitive for you.<\/li>\n<li><strong>Potential predictions<\/strong>With enough data, the following things can be predicted: when you need time off, when you get sick, what your stress profile will look like tomorrow, whether you are \u201ein the red zone\u201c, whether you are sleeping too little, whether you are developing risky patterns. This is diagnostically valuable - but socially dangerous.<\/li>\n<\/ol>\n<p>Wearables measure far more than just pulse and steps. Psychophysiological data records are created in the background that allow conclusions to be drawn about mood, stress, strain and even personality. Most users are unaware of this.<\/p>\n<p>And this is precisely where the risk lies later on - not in the technology itself, but in what is made of this data at some point.<\/p>\n<hr \/>\n<h3>Current survey on digitalization in everyday life<\/h3>\n<div class='bootstrap-yop yop-poll-mc'>\n\t\t\t\t\t\t\t<div class=\"basic-yop-poll-container\" style=\"background-color:#ffffff; border:0px; border-style:solid; border-color:#000000; border-radius:5px; padding:0px 5px;\" data-id=\"2\" data-temp=\"basic-pretty\" data-skin=\"square\" data-cscheme=\"blue\" data-cap=\"0\" data-access=\"guest\" data-tid=\"\" data-uid=\"bad905372c5e2d85f471cabe3973c6cf\" data-pid=\"4229\" data-resdet=\"votes-number,percentages\" data-show-results-to=\"guest\" data-show-results-moment=\"after-vote\" data-show-results-only=\"false\" data-show-message=\"true\" data-show-results-as=\"bar\" data-sort-results-by=\"as-defined\" data-sort-results-rule=\"asc\"data-is-ended=\"0\" data-percentages-decimals=\"2\" data-gdpr=\"no\" data-gdpr-sol=\"consent\" data-css=\"\" data-counter=\"0\" data-load-with=\"1\" data-notification-section=\"top\"><div class=\"row\"><div class=\"col-md-12\"><div class=\"basic-inner\"><div class=\"basic-message hide\" style=\"border-left: 10px solid #008000; padding: 0px 10px;\" data-error=\"#ff0000\" data-success=\"#008000\"><p class=\"basic-message-text\" style=\"color:#000000; font-size:14px; font-weight:normal;\"><\/p><\/div><div class=\"basic-overlay hide\"><div class=\"basic-vote-options\"><\/div><div class=\"basic-preloader\"><div class=\"basic-windows8\"><div class=\"basic-wBall basic-wBall_1\"><div class=\"basic-wInnerBall\"><\/div><\/div><div class=\"basic-wBall basic-wBall_2\"><div class=\"basic-wInnerBall\"><\/div><\/div><div class=\"basic-wBall basic-wBall_3\"><div class=\"basic-wInnerBall\"><\/div><\/div><div class=\"basic-wBall basic-wBall_4\"><div class=\"basic-wInnerBall\"><\/div><\/div><div class=\"basic-wBall basic-wBall_5\"><div class=\"basic-wInnerBall\"><\/div><\/div><\/div><\/div><\/div><form class=\"basic-form\" action=\"\"><input type=\"hidden\" name=\"_token\" value=\"148506a095\" autocomplete=\"off\"><div class=\"basic-elements\"><div class=\"basic-element basic-question basic-question-text-vertical\" data-id=\"2\" data-uid=\"074bb19cabb7a7c020be6a794c4df308\" data-type=\"question\" data-question-type=\"text\" data-required=\"yes\" data-allow-multiple=\"no\" data-min=\"1\" data-max=\"1\" data-display=\"vertical\" data-colnum=\"\" data-display-others=\"no\" data-others-color=\"\" data-others=\"\" data-others-max-chars=\"0\"><div class=\"basic-question-title\"><h5 style=\"color:#000000; font-size:16px; font-weight:normal; text-align:left;\">How do you rate the influence of digitalization on your everyday life?<\/h5><\/div><ul class=\"basic-answers\"><li class=\"basic-answer\" style=\"padding:0px 0px;\" data-id=\"5\" data-type=\"text\" data-vn=\"17\" data-color=\"#000000\" data-make-link=\"no\" data-link=\"\"><div class=\"basic-answer-content basic-text-vertical\"><label for=\"answer[5]\" class=\"basic-answer-label\"><input type=\"radio\" id=\"answer[5]\" name=\"answer[2]\" value=\"5\"><span class=\"basic-text\" style=\"color: #000000; font-size: 14px; font-weight: normal;\">Very positive - I benefit from it every day<\/span><\/label><\/div><\/li><li class=\"basic-answer\" style=\"padding:0px 0px;\" data-id=\"6\" data-type=\"text\" data-vn=\"13\" data-color=\"#000000\" data-make-link=\"no\" data-link=\"\"><div class=\"basic-answer-content basic-text-vertical\"><label for=\"answer[6]\" class=\"basic-answer-label\"><input type=\"radio\" id=\"answer[6]\" name=\"answer[2]\" value=\"6\"><span class=\"basic-text\" style=\"color: #000000; font-size: 14px; font-weight: normal;\">Rather positive - some things have become easier<\/span><\/label><\/div><\/li><li class=\"basic-answer\" style=\"padding:0px 0px;\" data-id=\"7\" data-type=\"text\" data-vn=\"33\" data-color=\"#000000\" data-make-link=\"no\" data-link=\"\"><div class=\"basic-answer-content basic-text-vertical\"><label for=\"answer[7]\" class=\"basic-answer-label\"><input type=\"radio\" id=\"answer[7]\" name=\"answer[2]\" value=\"7\"><span class=\"basic-text\" style=\"color: #000000; font-size: 14px; font-weight: normal;\">Mixed - It brings advantages, but also loss of control<\/span><\/label><\/div><\/li><li class=\"basic-answer\" style=\"padding:0px 0px;\" data-id=\"8\" data-type=\"text\" data-vn=\"5\" data-color=\"#000000\" data-make-link=\"no\" data-link=\"\"><div class=\"basic-answer-content basic-text-vertical\"><label for=\"answer[8]\" class=\"basic-answer-label\"><input type=\"radio\" id=\"answer[8]\" name=\"answer[2]\" value=\"8\"><span class=\"basic-text\" style=\"color: #000000; font-size: 14px; font-weight: normal;\">Rather negative - I often feel overwhelmed or observed<\/span><\/label><\/div><\/li><li class=\"basic-answer\" style=\"padding:0px 0px;\" data-id=\"9\" data-type=\"text\" data-vn=\"9\" data-color=\"#000000\" data-make-link=\"no\" data-link=\"\"><div class=\"basic-answer-content basic-text-vertical\"><label for=\"answer[9]\" class=\"basic-answer-label\"><input type=\"radio\" id=\"answer[9]\" name=\"answer[2]\" value=\"9\"><span class=\"basic-text\" style=\"color: #000000; font-size: 14px; font-weight: normal;\">Very negative - I largely reject digital systems<\/span><\/label><\/div><\/li><\/ul><\/div><div class=\"clearfix\"><\/div><\/div><div class=\"basic-vote\"><a href=\"#\" class=\"button basic-vote-button\" role=\"button\" style=\"background:#027bb8; border:0px; border-style: solid; border-color:#000000; border-radius:5px; padding:10px 10px; color:#ffffff; font-size:14px; font-weight:normal;\">Vote<\/a><\/div><input type=\"hidden\" name=\"trp-form-language\" value=\"en\"\/><\/form><\/div><\/div><\/div><\/div>\n\t\t\t\t\t\t<\/div>\n<hr \/>\n<h2>Where all this data really ends up - and why it is often different than many people think<\/h2>\n<p>When dealing with wearables, sooner or later you come up against a simple but crucial question: where does all this data actually go? Many users blindly trust that their manufacturer \u201ewill do a good job\u201c. But this trust is often based on gut feeling - not knowledge. And the differences between manufacturers are greater than they appear to be.<\/p>\n<p>The truth is: there are no wearables without data processing. The only question is where the data is processed - and how long it stays there.<\/p>\n<h3>Apple: lots of local storage, lots of encryption - but not completely independent<\/h3>\n<p>Apple has deliberately positioned itself as a \u201edata protection company\u201c over the years. And in comparison, this is true - they are actually the most cautious of the major manufacturers. The most important points:<\/p>\n<ul>\n<li>The <strong>Health app<\/strong> on the iPhone saves a lot locally.<\/li>\n<li>When data is entered into the <strong>iCloud<\/strong> they are usually end-to-end encrypted - at least according to Apple.<\/li>\n<li>A lot of data is only processed when the iPhone is unlocked.<\/li>\n<li>Apple does not analyze health data for advertising purposes.<\/li>\n<\/ul>\n<p>That sounds good - and at the moment it is. But there is no guarantee that it will always stay that way. Apple can change its rules. States can change laws. Authorities can demand access. And Apple is a listed company - not a charity.<\/p>\n<p>But the most important point is another: even locally stored data changes its risk in the long term the more of it is created. Twenty years of health data on a device is more valuable - and more at risk - than a few weeks.<\/p>\n<h3>Google (Android): lots of cloud, lots of analysis, lots of marketing - little transparency<\/h3>\n<p>The situation is completely different at Google. Google doesn't earn its money with devices, but with data. And you can feel that. Typical features:<\/p>\n<ul>\n<li>Wearable data migrates much more frequently to the Google cloud.<\/li>\n<li>Health data is used to optimize services - which is always a broad field.<\/li>\n<li>Fitbit is now owned by Google, and their systems are even more cloud-centric.<\/li>\n<\/ul>\n<p>Google does not officially use health data for advertising - but the system is based on data analysis. Android is technically open, but that does not automatically mean more data protection. On the contrary: the more apps are installiert, the more interfaces access sensors.<\/p>\n<p>While Apple blocks many app accesses restrictively, Android allows significantly more in practice - and users hardly notice it. If you look at it soberly, the following applies:<\/p>\n<ul>\n<li><strong>Apple<\/strong> collects less because they sell appliances.<\/li>\n<li><strong>Google<\/strong> collects more because they sell data.<\/li>\n<\/ul>\n<p>You simply have to know that before you decide.<\/p>\n<h3>Samsung, Garmin, Huawei, Xiaomi and others: Intermediate comfort and data collection<\/h3>\n<p>Then there is the large group of \u201eother manufacturers\u201c. And this is where it gets confusing, because the spectrum ranges from exemplary to completely non-transparent.<\/p>\n<ul>\n<li><strong>Samsung (Wear OS + own cloud)<\/strong>Samsung is a kind of hybrid: they are based on Android, but have their own services and their own cloud systems. A lot of data ends up in Samsung health services, in Google clouds and in interfaces to third-party providers. A typical example of modern device policy: many cooks stirring the same data mash.<\/li>\n<li><strong>Garmin (sports-oriented, but cloud-heavy)<\/strong>Garmin only works to a limited extent without the cloud. The \u201eGarmin Connect\u201c platform is a central component. Data is permanently stored, analyzed and archived for years. Garmin is reputable, but data sovereignty does not lie with the user. It cannot be operated completely offline.<\/li>\n<li><strong>Huawei, Xiaomi, Amazfit (the Asian corner)<\/strong>: This is where it gets tricky. Not because of political panic, but because the companies provide very little documentation. What these devices usually have in common is that they are very cheap, have an extremely large number of sensors and store evaluations almost exclusively in the cloud. There is also little transparency and the server locations are often unclear. Anyone who values data protection will generally not use them.<\/li>\n<\/ul>\n<h2>Wearable headphones: the most invisible data source of all<\/h2>\n<p>Many people don't think of sensors when they think of headphones. Yet in-ear devices are technically ideally suited to measuring biosignals:<\/p>\n<ul>\n<li>Circulation<\/li>\n<li>Micromovements<\/li>\n<li>Skin conductivity<\/li>\n<li>Breathing pattern<\/li>\n<li>sometimes even skin temperature<\/li>\n<\/ul>\n<p>Not all manufacturers make use of these possibilities - but it has long been technically feasible. And manufacturers are reluctant to communicate this because \u201emusic listeners\u201c don't actually expect \u201ebiosignal trackers\u201c. To be honest, headphones today are sometimes small health measuring devices disguised as lifestyle accessories.<\/p>\n<p>The real difference: Which manufacturer earns its money with what? This is the point that must never be forgotten in the whole discussion:<\/p>\n<ul>\n<li><strong>Apple<\/strong> earns its money with devices. Data is a bonus for Apple - not the core business.<\/li>\n<li><strong>Google<\/strong> earns its money with data. Wearables are a bonus for Google - not its core business.<\/li>\n<li><strong>Samsung<\/strong> and others sit somewhere in between. A bit of hardware, a bit of services, a bit of cloud.<\/li>\n<li><strong>Low-cost manufacturer<\/strong> earn their money with mass - and the data flows wherever it goes.<\/li>\n<\/ul>\n<p>The more a manufacturer lives financially from data dependency, the greater the risk for the user. This is an old rule that has never changed.<\/p>\n<h3>What's the bottom line?<\/h3>\n<p>It's not the technology that brings the risk - it's the structure behind it:<\/p>\n<ul>\n<li>Who pays what?<\/li>\n<li>Where are the servers located?<\/li>\n<li>What do the GTCs say?<\/li>\n<li>How often does the manufacturer change its rules?<\/li>\n<li>What laws will apply tomorrow?<\/li>\n<\/ul>\n<p>Many people only see the beautiful interface, the colorful diagrams and the practical functions. But the long-term question is always:<\/p>\n<blockquote><p>What data is stored where - and who might want it one day?<\/p><\/blockquote>\n<h2>Overview of recorded data and their links<\/h2>\n<div style=\"overflow-x: auto;\">\n<table style=\"border-collapse: collapse; width: 100%; font-family: Arial, sans-serif;\">\n<thead>\n<tr style=\"background: #f2f2f2;\">\n<th style=\"border: 1px solid #ccc; padding: 8px;\">Recorded data<\/th>\n<th style=\"border: 1px solid #ccc; padding: 8px;\">Sensor \/ Source<\/th>\n<th style=\"border: 1px solid #ccc; padding: 8px;\">How the data is combined<\/th>\n<th style=\"border: 1px solid #ccc; padding: 8px;\">Possible conclusions<\/th>\n<th style=\"border: 1px solid #ccc; padding: 8px;\">Long-term risks<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px;\"><strong>Heart rate<\/strong><\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Optical pulse sensor (PPG)<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Combination with movement, breathing, HRV<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Stress, fitness level, emotional reactions<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Risk profiles for insurance companies, recognizable susceptibility to stress<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px;\"><strong>Heart rate variability (HRV)<\/strong><\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">PPG + algorithmic analysis<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Linking with sleep data and breathing patterns<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Stress level, recovery, vegetative state<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Prediction of burnout, mental resilience visible<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px;\"><strong>Breathing rate<\/strong><\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Motion sensors, chest\/body movement<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Combination with HRV and sleep phases<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Calmness\/nervousness, emotional state<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Early detection of stress or panic patterns<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px;\"><strong>Sleep patterns<\/strong><\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Motion sensors + pulse analysis algorithms<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Combination with HRV, respiratory rate and daily profiles<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Recovery, sleep quality, nocturnal stress phases<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Derivation of health risks, energy profiles<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px;\"><strong>Movement profiles \/ steps<\/strong><\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Gyroscope, accelerometer<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Link with location, pulse and daily rhythm<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Activity behavior, routines, health level<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Lifestyle profiles, possible risk assessments<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px;\"><strong>Location and movement routes<\/strong><\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">GPS, WLAN, mobile radio<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Comparison with emotional reactions (HRV\/stress)<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Which places trigger stress, social routines<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Behavior profile, predictive behavior<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px;\"><strong>Skin conductivity<\/strong><\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">EDA sensors (e.g. in headphones\/watches)<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Combination of stress values, respiration, pulse<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Emotional arousal, stress peaks<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Psychological profiles, lie\/reaction analyses<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px;\"><strong>Blood flow in the ear canal<\/strong><\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">In-ear PPG sensors<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Link with HRV &amp; emotional reactions<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Accurate stress\/excitation profile in real time<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Fine-resolution emotion recognition without consent<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px;\"><strong>Body temperature<\/strong><\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Temperature sensors in clocks\/rings<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Combination with sleep, HRV, cycle data<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">State of health, cycle and hormone status<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Sensitive health profile, reproductive data<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px;\"><strong>Micro-movements \/ muscle tension<\/strong><\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">IMU sensors, EMG-like algorithms<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Comparison with HRV, breathing and audio events<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Nervousness, inner restlessness, loss of focus<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Analysis of psychological resilience<\/td>\n<\/tr>\n<tr>\n<td style=\"border: 1px solid #ccc; padding: 8px;\"><strong>Everyday routines &amp; time patterns<\/strong><\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Automatic pattern recognition<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Linking of all collected data<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Daily energy, productivity, habits<\/td>\n<td style=\"border: 1px solid #ccc; padding: 8px;\">Predictability of human behavior<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2>The psychological invisibility of data collection<\/h2>\n<p>Anyone who wears a smartwatch today or puts headphones in their ears usually thinks they are simply listening to their favorite music, counting their steps or perhaps understanding their sleep a little better. But hardly anyone seriously asks themselves what these devices are doing in the background - and how much they reveal about themselves.<\/p>\n<p>This is not necessarily due to a lack of intelligence or naivety. It is due to something deeper: The way this technology works is difficult for humans to grasp. It is invisible, silent, unobtrusive - and this is where the real danger lies. It creates a kind of psychological blindness that leads many people into data collection without them really realizing it.<\/p>\n<h3>The invisible nature of measurement: everything runs automatically<\/h3>\n<p>In the past, you had to go to the doctor, be wired up, lie still and then something was measured. You knew that a measurement was taking place - and you actively opted for it. Today, on the other hand, everything happens in passing.<\/p>\n<ul>\n<li>In the morning you put on your <strong>Smartwatch<\/strong> on - it starts to measure.<\/li>\n<li>You put <strong>in-ears<\/strong> in your ear - they register whether you are restless.<\/li>\n<li>You go for a walk - your pulse, your breathing, your movement patterns are analyzed.<\/li>\n<li><strong>You are measured<\/strong> - without you consciously realizing it.<\/li>\n<\/ul>\n<p>And because the technology is so gentle, so silent, so intelligent, you think: \u201eIt's just for me.\u201c But that's not always true. This invisibility of detection is psychologically treacherous. Because what you can't see, you don't feel as an intervention.<\/p>\n<h3>The terms disguise the functions<\/h3>\n<p>Another problem is the language. In the app settings or in the terms and conditions you then read things like:<\/p>\n<ul>\n<li>\u201eActivate sensor fusion\u201c<\/li>\n<li>\u201eImprove biosignal support\u201c<\/li>\n<li>\u201eadaptive health analysis\u201c<\/li>\n<li>\u201euser-centric optimization\u201c<\/li>\n<li>\u201eMotion Coprocessing\u201c<\/li>\n<\/ul>\n<p>It all sounds harmless or even helpful. In reality, these terms translate as:<\/p>\n<blockquote><p><em>\u201eWe measure you as comprehensively as possible - and we know how you react internally.\u201c<\/em><\/p><\/blockquote>\n<p>But of course it doesn't say that. And that's exactly the trick. The words sound technical, modern, well-intentioned - and deliberately leave what they mean in the dark. This way, there is no defense. The user nods at everything - not out of approval, but out of a lack of discomfort.<\/p>\n<h3>Marketing outshines risk awareness<\/h3>\n<p>Apple, Google &amp; Co. are true masters of marketing. Their advertising campaigns show happy people, health, self-optimization and joie de vivre. Wearables are colorful, smart, elegant - and give you the feeling that you are doing something good for yourself. There are no warnings, no accompanying information, no real reflection.<\/p>\n<p>The result: the modern user is emotionally bought in - and technically taken by surprise. The devices look like helpers - but they are actually measuring stations that permanently and reliably record body signals. The fact that this data could one day be used for other purposes is something no one is thinking about at the moment.<\/p>\n<h3>Convenience beats thinking<\/h3>\n<p>Another psychological factor is convenience. Once set up, everything runs by itself. The app shows nice diagrams, the battery lasts a long time, the watch feels good - so why question it?<\/p>\n<p>But this comfort zone is dangerous. It lulls you to sleep. It prevents questions such as:<\/p>\n<ul>\n<li>What happens to my data when I sell the device?<\/li>\n<li>What does the cloud really store?<\/li>\n<li>What patterns can be recognized from my HRV data?<\/li>\n<li>What could an algorithm learn about me from my sleep curves?<\/li>\n<\/ul>\n<p>The answer is usually: more than you think.<\/p>\n<h3>Social norms make criticism suspect<\/h3>\n<p>Just a few years ago, it was normal not to wear a smartwatch. Today, you are quickly considered \u201eold-fashioned\u201c, \u201efar removed from technology\u201c or \u201esuspicious\u201c.<br \/>\nThose who consciously decide against wearables are often ridiculed - sometimes even subtly ostracized. This creates social norms that make the use of technology compulsory - without any coercion. If you want to \u201emove with the times\u201c, you have to be measured. It would be wiser to ask:<\/p>\n<blockquote><p>Who really benefits from this data - me or someone else?<\/p><\/blockquote>\n<h3>Traditional caution is portrayed as a weakness<\/h3>\n<p>In the past, it was completely normal to have a healthy distrust of technology. People knew that there were two sides to everything new.<br \/>\nToday, on the other hand, any skepticism is quickly regarded as \u201econspiracy\u201c, \u201eparanoia\u201c or \u201etechnophobic\u201c.<\/p>\n<p>This is no coincidence. It is the result of targeted campaigns that ridicule uncertainty - so that nobody looks too closely. Yet it is precisely this questioning that is necessary. Not to demonize technology, but to avoid slipping blindly into a dependency.<\/p>\n<p>Data collection through wearables is so cleverly designed that it doesn't seem like an intrusion. It appears helpful, friendly, smart - almost like a good friend. And that's exactly why it's so effective. There is no beep. No signal. No warning. Just data - lots of unobtrusive, continuous data.<\/p>\n<p>And at some point, in five or ten years' time, this data will become something that the user never intended: a comprehensive, analyzable, marketable profile of themselves. That's why it's worth thinking classically again:<\/p>\n<p>Technology is not neutral. Technology pursues interests. And if you don't know who has control, then you no longer have it yourself.<\/p>\n<hr \/>\n<h3>Current survey on the planned digital ID<\/h3>\n<div class='bootstrap-yop yop-poll-mc'>\n\t\t\t\t\t\t\t<div class=\"basic-yop-poll-container\" style=\"background-color:#ffffff; border:0px; border-style:solid; border-color:#000000; border-radius:5px; padding:0px 5px;\" data-id=\"4\" data-temp=\"basic-pretty\" data-skin=\"square\" data-cscheme=\"blue\" data-cap=\"0\" data-access=\"guest\" data-tid=\"\" data-uid=\"6f151d1ef17b25fc3e0a1ea0662fd54a\" data-pid=\"4229\" data-resdet=\"votes-number,percentages\" data-show-results-to=\"guest\" data-show-results-moment=\"after-vote\" data-show-results-only=\"false\" data-show-message=\"true\" data-show-results-as=\"bar\" data-sort-results-by=\"as-defined\" data-sort-results-rule=\"asc\"data-is-ended=\"0\" data-percentages-decimals=\"2\" data-gdpr=\"no\" data-gdpr-sol=\"consent\" data-css=\"\" data-counter=\"0\" data-load-with=\"1\" data-notification-section=\"top\"><div class=\"row\"><div class=\"col-md-12\"><div class=\"basic-inner\"><div class=\"basic-message hide\" style=\"border-left: 10px solid #008000; padding: 0px 10px;\" data-error=\"#ff0000\" data-success=\"#008000\"><p class=\"basic-message-text\" style=\"color:#000000; font-size:14px; font-weight:normal;\"><\/p><\/div><div class=\"basic-overlay hide\"><div class=\"basic-vote-options\"><\/div><div class=\"basic-preloader\"><div class=\"basic-windows8\"><div class=\"basic-wBall basic-wBall_1\"><div class=\"basic-wInnerBall\"><\/div><\/div><div class=\"basic-wBall basic-wBall_2\"><div class=\"basic-wInnerBall\"><\/div><\/div><div class=\"basic-wBall basic-wBall_3\"><div class=\"basic-wInnerBall\"><\/div><\/div><div class=\"basic-wBall basic-wBall_4\"><div class=\"basic-wInnerBall\"><\/div><\/div><div class=\"basic-wBall basic-wBall_5\"><div class=\"basic-wInnerBall\"><\/div><\/div><\/div><\/div><\/div><form class=\"basic-form\" action=\"\"><input type=\"hidden\" name=\"_token\" value=\"28c20d9adc\" autocomplete=\"off\"><div class=\"basic-elements\"><div class=\"basic-element basic-question basic-question-text-vertical\" data-id=\"4\" data-uid=\"45588e17bd22c988313af5fe92ec8a8b\" data-type=\"question\" data-question-type=\"text\" data-required=\"yes\" data-allow-multiple=\"no\" data-min=\"1\" data-max=\"1\" data-display=\"vertical\" data-colnum=\"\" data-display-others=\"no\" data-others-color=\"\" data-others=\"\" data-others-max-chars=\"0\"><div class=\"basic-question-title\"><h5 style=\"color:#000000; font-size:16px; font-weight:normal; text-align:left;\">Would you accept a centralized digital identity at EU level?<\/h5><\/div><ul class=\"basic-answers\"><li class=\"basic-answer\" style=\"padding:0px 0px;\" data-id=\"14\" data-type=\"text\" data-vn=\"9\" data-color=\"#000000\" data-make-link=\"no\" data-link=\"\"><div class=\"basic-answer-content basic-text-vertical\"><label for=\"answer[14]\" class=\"basic-answer-label\"><input type=\"radio\" id=\"answer[14]\" name=\"answer[4]\" value=\"14\"><span class=\"basic-text\" style=\"color: #000000; font-size: 14px; font-weight: normal;\">Yes, if it is safe and voluntary<\/span><\/label><\/div><\/li><li class=\"basic-answer\" style=\"padding:0px 0px;\" data-id=\"15\" data-type=\"text\" data-vn=\"10\" data-color=\"#000000\" data-make-link=\"no\" data-link=\"\"><div class=\"basic-answer-content basic-text-vertical\"><label for=\"answer[15]\" class=\"basic-answer-label\"><input type=\"radio\" id=\"answer[15]\" name=\"answer[4]\" value=\"15\"><span class=\"basic-text\" style=\"color: #000000; font-size: 14px; font-weight: normal;\">Only if it is not linked to other data<\/span><\/label><\/div><\/li><li class=\"basic-answer\" style=\"padding:0px 0px;\" data-id=\"16\" data-type=\"text\" data-vn=\"135\" data-color=\"#000000\" data-make-link=\"no\" data-link=\"\"><div class=\"basic-answer-content basic-text-vertical\"><label for=\"answer[16]\" class=\"basic-answer-label\"><input type=\"radio\" id=\"answer[16]\" name=\"answer[4]\" value=\"16\"><span class=\"basic-text\" style=\"color: #000000; font-size: 14px; font-weight: normal;\">No, I reject that in principle<\/span><\/label><\/div><\/li><li class=\"basic-answer\" style=\"padding:0px 0px;\" data-id=\"59\" data-type=\"text\" data-vn=\"5\" data-color=\"#000000\" data-make-link=\"no\" data-link=\"\"><div class=\"basic-answer-content basic-text-vertical\"><label for=\"answer[59]\" class=\"basic-answer-label\"><input type=\"radio\" id=\"answer[59]\" name=\"answer[4]\" value=\"59\"><span class=\"basic-text\" style=\"color: #000000; font-size: 14px; font-weight: normal;\">What is a \"central digital identity\"?<\/span><\/label><\/div><\/li><\/ul><\/div><div class=\"clearfix\"><\/div><\/div><div class=\"basic-vote\"><a href=\"#\" class=\"button basic-vote-button\" role=\"button\" style=\"background:#027bb8; border:0px; border-style: solid; border-color:#000000; border-radius:5px; padding:10px 10px; color:#ffffff; font-size:14px; font-weight:normal;\">Vote<\/a><\/div><input type=\"hidden\" name=\"trp-form-language\" value=\"en\"\/><\/form><\/div><\/div><\/div><\/div>\n\t\t\t\t\t\t<\/div>\n<hr \/>\n<h2>A counter-proposal: using technology without being at the mercy of others<\/h2>\n<p>After all these critical observations, the question naturally arises: What now? Do we all have to throw away our smartwatches, never use headphones again and go back to wristwatches with hands?<\/p>\n<p>No. That's not the point. Technology can be useful. It can motivate, help, provide reminders, promote health - if it is used consciously. The problem is not the technology itself, but the thoughtless, continuous use that exposes more data than most people realize. And this is precisely where a healthy counter-proposal comes in: Technology yes - but not at any price.<\/p>\n<h3>Conscious handling instead of permanent tracking<\/h3>\n<p>I also own a Apple watch myself. I find the technology fascinating, it works amazingly well, it has style - and occasionally I like to put it on. But: I don't wear it all the time. For example, if I want to know how many steps I've taken on a particular route or whether I've done enough exercise in a particular week - then I use it specifically. Then I take it off again. Otherwise, I only activate tracking functions consciously and specifically - never permanently.<\/p>\n<p>But at the same time, I keep realizing that - in a way, quite traditionally - I have a certain caution. I've never used Bluetooth headphones, for example. If at all, I reach for the classic cable versions. Not out of nostalgia, but because I don't want any wireless radiation directly on my ear.<\/p>\n<p>I decide when a device measures - not the device. For me, this attitude is not a restriction, but a piece of self-determination.<\/p>\n<h3>Headphones: The underestimated proximity to the nervous system<\/h3>\n<p>I am particularly skeptical of Bluetooth in-ears, i.e. wireless headphones that sit directly in the ear canal. I know many people wear them all day long these days. Some even use them when they go to sleep.<\/p>\n<p>But I honestly ask myself: is it really healthy to have a radio in your ear - right next to the body's finest nerve cells? Personally, I avoid such devices completely. If I want to listen to music when I'm out and about, I use traditional headphones with a cable.<\/p>\n<p>Old-fashioned? Maybe. But I'd rather have a bit of cable clutter than a constant wireless connection on my head. And now that it's clear that many of these devices also contain measurement sensors - some even for biometric signals - I prefer this decision all the more.<\/p>\n<h3>Data sovereignty begins in everyday life<\/h3>\n<p>You don't need to take any major steps to regain more control over your own data. Even small changes in behavior make a difference:<\/p>\n<ul>\n<li>Only wear your smartwatch when you really need it<\/li>\n<li>Only activate location sharing specifically<\/li>\n<li>Question apps that want to retrieve \u201efitness data\u201c<\/li>\n<li>Do not leave Bluetooth switched on permanently<\/li>\n<li>Disconnect devices regularly when not in use<\/li>\n<li>Check data exports regularly and delete if necessary<\/li>\n<\/ul>\n<p>In short: don't let everything run automatically. Precisely because technology is so convenient, it is important to remember that convenience does not always go hand in hand with security.<\/p>\n<h2>Traditional virtues in the modern world<\/h2>\n<p>What used to be taken for granted is now often considered \u201etoo cautious\u201c. Yet it is precisely this caution that is a sign of foresight. In the past, people didn't simply believe everything that was on the packaging. People knew that technology follows interests. People were prepared to form their own opinions. And people didn't let themselves become guinea pigs - just because something was new.<\/p>\n<p>This attitude is more important today than ever. Precisely because everything is developing so quickly, because functions and terms and conditions change regularly, because nobody really knows what the systems will look like in ten years' time. Technology is a tool - but not an invisible companion that you should blindly tell everything about yourself.<\/p>\n<p>It was important to me to write this article because I keep observing in my environment - and also in the wider social context - how carelessly many people use wearables and sensor technology. Often out of curiosity, sometimes out of habit - but almost never with any real awareness. Some people literally wear devices on their bodies or in their ears all day long that quietly collect data - data that may seem harmless today, but could become a decisive factor tomorrow: when it comes to tariffs, insurance, medical consultations, algorithms that you can no longer even see through yourself.<\/p>\n<p>It's not about scaring people. It's about seeing clearly. Technology is here to stay - but how we use it is up to us. And if you start making conscious decisions early on, you not only protect your data - but also your right to a self-determined life. And, of course, it's also about data sovereignty. Because although a lot is measured, the data analysis is only as good as the app and what the manufacturer allows.<\/p>\n<p>If you want to go even further and measure your whole body over long periods of time, similar to \u201eStar Trek with a tricorder\u201c, you can do this with an NLS device, which I wrote about a few years ago. <a href=\"https:\/\/www.markus-schall.de\/en\/2023\/04\/health-tips-not-only-for-filemaker-users\/\"><strong>Article written<\/strong><\/a> had. However, I have to admit that I have been measuring myself regularly with it for over 5 years, but apart from collecting the data, I have not yet evaluated much. But I still have an advantage: all the data I have measured so far is on my hard disk and I have a chronology of all the measurements on my own hard disk and will never have access to a cloud system.<\/p>\n<h2>Important studies on wearables and data collection<\/h2>\n<ul>\n<li><a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC11126007\/\" target=\"_blank\" rel=\"noopener\"><strong>Personalized Stress Detection Using Biosignals from Wearables<\/strong><\/a> (Bolpagni et al., 2024) - investigates how wearables detect biosignals in natural environments and recognize stress levels using machine learning models.<\/li>\n<li><a href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC10046749\/\" target=\"_blank\" rel=\"noopener\"><strong>Mental Stress Detection Using a Wearable In-Ear PPG System<\/strong><\/a> (Barki et al., 2023) - Study on an ear sensor system (in-ear) for the detection of mental stress using PPG.<\/li>\n<li><a href=\"https:\/\/www.frontiersin.org\/journals\/computer-science\/articles\/10.3389\/fcomp.2024.1478851\/full\" target=\"_blank\" rel=\"noopener\"><strong>Detection and monitoring of stress using wearables<\/strong><\/a> (Pinge et al., 2024) - systematic review on sensors and wearables for stress detection.<\/li>\n<li><a href=\"https:\/\/link.springer.com\/article\/10.1007\/s12559-023-10200-0\" target=\"_blank\" rel=\"noopener\"><strong>State-of-the-Art of Stress Prediction from Heart Rate Variability Data<\/strong><\/a> (Haque et al., 2024) - shows the relevance of HRV data for stress prediction and how algorithms are used for this purpose.<\/li>\n<li><a href=\"https:\/\/www.mdpi.com\/1424-8220\/23\/1\/332\" target=\"_blank\" rel=\"noopener\"><strong>Wearable-Measured Sleep and Resting Heart Rate Variability as an Outcome...<\/strong><\/a> (de Vries et al., 2023) - Study with wearables, sleep time and HRV as predictors of subjectively measured stress.<\/li>\n<li><a href=\"https:\/\/www.tandfonline.com\/doi\/full\/10.1080\/17434440.2021.2014321\" target=\"_blank\" rel=\"noopener\"><strong>Hearables, in-ear sensing devices for bio-signal acquisition<\/strong><\/a> (Ne et al., 2021) - Review of \u201ehearables\u201c (i.e. in-ear devices) and their ability to detect physiological signals.<\/li>\n<\/ul>\n<hr \/>\n\n\t\t\t<div class=\"display-post-types\">\n\n\t\t\t\t\t\t\t<style type=\"text\/css\">\n\t\t\t#dpt-wrapper-91 { --dpt-text-align: left;--dpt-image-crop: center;--dpt-border-radius: 5px;--dpt-h-gutter: 10px;--dpt-v-gutter: 9px; }\t\t\t<\/style>\n\t\t\t<style type=\"text\/css\">#dpt-wrapper-91 { --dpt-title-font-style:normal;--dpt-title-font-weight:600;--dpt-title-line-height:1.5;--dpt-title-text-decoration:none;--dpt-title-text-transform:none;--dpt-excerpt-font-style:normal;--dpt-excerpt-font-weight:400;--dpt-excerpt-line-height:1.5;--dpt-excerpt-text-decoration:none;--dpt-excerpt-text-transform:none;--dpt-meta1-font-style:normal;--dpt-meta1-font-weight:400;--dpt-meta1-line-height:1.9;--dpt-meta1-text-decoration:none;--dpt-meta1-text-transform:none;--dpt-meta2-font-style:normal;--dpt-meta2-font-weight:400;--dpt-meta2-line-height:1.9;--dpt-meta2-text-decoration:none;--dpt-meta2-text-transform:none; }<\/style><div class=\"dpt-main-header\">\n\t\t\t\t\t\t<div class=\"dpt-main-title\">\n\t\t\t\t\t\t\t<span class=\"dpt-main-title-text\">Current health topics<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t<\/div>\t\t\t\n\t\t\t\t<div id=\"dpt-wrapper-91\" class=\"dpt-wrapper dpt-mag1 land1 dpt-cropped dpt-flex-wrap\" >\n\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"dpt-entry has-thumbnail\" data-title=\"mcs: wenn das leben dich zum dritten mal zwingt umzuziehen\" data-id=\"2822\"  data-category=\"allgemein b\u00fccher gesundheit\" data-post_tag=\"auswandern cmd erfahrungen hypersensibilit\u00e4t krisen mcs pers\u00f6nlichkeitsentwicklung ratgeber\">\n\t\t\t\t\t\t\t<div class=\"dpt-entry-wrapper\"><div class=\"dpt-featured-content\"><div class=\"dpt-permalink\"><a href=\"https:\/\/www.markus-schall.de\/en\/2025\/09\/mcs-when-life-forces-you-to-move-for-the-third-time\/\" class=\"dpt-permalink\"><span class=\"screen-reader-text\">MCS: When life forces you to move for the third time<\/span><\/a><\/div><div class=\"dpt-thumbnail\"><div class=\"dpt-thumbnail-inner\"><img width=\"1024\" height=\"684\" class=\"attachment-full size-full\" alt=\"Three forced removals due to MCS (Multiple Chemical Sensitivity)\" context=\"dpt\" data-dpt-src=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/mcs-baustelle-krise.jpg\" data-dpt-sizes=\"(max-width: 1024px) 100vw, 1024px\" data-dpt-srcset=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/mcs-baustelle-krise.jpg 1024w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/mcs-baustelle-krise-300x200.jpg 300w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/mcs-baustelle-krise-768x513.jpg 768w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/mcs-baustelle-krise-18x12.jpg 18w\" \/><\/div><span class=\"dpt-thumbnail-aspect-ratio\" style=\"padding-top: 75%\"><\/span><\/div><\/div><div class=\"sub-entry\"><h3 class=\"dpt-title\"><a class=\"dpt-title-link\" href=\"https:\/\/www.markus-schall.de\/en\/2025\/09\/mcs-when-life-forces-you-to-move-for-the-third-time\/\" rel=\"bookmark\">MCS: When life forces you to move for the third time<\/a><\/h3><\/div><\/div>\n\t\t\t\t\t\t<\/div><!-- .dpt-entry -->\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"dpt-entry has-thumbnail\" data-title=\"zahnreinigung &#8211; sinnvoll oder \u00fcbertrieben? eine differenzierte betrachtung\" data-id=\"2920\"  data-category=\"allgemein b\u00fccher gesundheit tipps &amp; anleitungen\" data-post_tag=\"buch cmd gesundheit hypersensibilit\u00e4t mcs\">\n\t\t\t\t\t\t\t<div class=\"dpt-entry-wrapper\"><div class=\"dpt-featured-content\"><div class=\"dpt-permalink\"><a href=\"https:\/\/www.markus-schall.de\/en\/2025\/09\/dental-cleaning-sensible-or-exaggerated-a-differentiated-view\/\" class=\"dpt-permalink\"><span class=\"screen-reader-text\">Dental cleaning - sensible or excessive? A differentiated view<\/span><\/a><\/div><div class=\"dpt-thumbnail\"><div class=\"dpt-thumbnail-inner\"><img width=\"1536\" height=\"1024\" class=\"attachment-full size-full\" alt=\"Dental cleaning - how often does it make sense?\" context=\"dpt\" data-dpt-src=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/zahnreinigung-sinnvoll.png\" data-dpt-sizes=\"(max-width: 1536px) 100vw, 1536px\" data-dpt-srcset=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/zahnreinigung-sinnvoll.png 1536w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/zahnreinigung-sinnvoll-300x200.png 300w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/zahnreinigung-sinnvoll-1024x683.png 1024w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/zahnreinigung-sinnvoll-768x512.png 768w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/zahnreinigung-sinnvoll-18x12.png 18w\" \/><\/div><span class=\"dpt-thumbnail-aspect-ratio\" style=\"padding-top: 75%\"><\/span><\/div><\/div><div class=\"sub-entry\"><h3 class=\"dpt-title\"><a class=\"dpt-title-link\" href=\"https:\/\/www.markus-schall.de\/en\/2025\/09\/dental-cleaning-sensible-or-exaggerated-a-differentiated-view\/\" rel=\"bookmark\">Dental cleaning - sensible or excessive? A differentiated view<\/a><\/h3><\/div><\/div>\n\t\t\t\t\t\t<\/div><!-- .dpt-entry -->\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"dpt-entry has-thumbnail\" data-title=\"sympathikus, parasympathikus und cortisol &#8211; wie stress unseren k\u00f6rper steuert\" data-id=\"5255\"  data-category=\"allgemein featured gesundheit\" data-post_tag=\"cmd gesundheit hypersensibilit\u00e4t krisen mcs ratgeber\">\n\t\t\t\t\t\t\t<div class=\"dpt-entry-wrapper\"><div class=\"dpt-featured-content\"><div class=\"dpt-permalink\"><a href=\"https:\/\/www.markus-schall.de\/en\/2026\/03\/sympathetic-nervous-system-parasympathetic-nervous-system-and-cortisol-how-stress-controls-our-body\/\" class=\"dpt-permalink\"><span class=\"screen-reader-text\">Sympathetic nervous system, parasympathetic nervous system and cortisol - how stress controls our body<\/span><\/a><\/div><div class=\"dpt-thumbnail\"><div class=\"dpt-thumbnail-inner\"><img width=\"1024\" height=\"683\" class=\"attachment-full size-full\" alt=\"Cortisol, sympathetic nervous system and stress\" context=\"dpt\" data-dpt-src=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/Sympathikus-Cortisol-Stress.jpg\" data-dpt-sizes=\"(max-width: 1024px) 100vw, 1024px\" data-dpt-srcset=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/Sympathikus-Cortisol-Stress.jpg 1024w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/Sympathikus-Cortisol-Stress-300x200.jpg 300w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/Sympathikus-Cortisol-Stress-768x512.jpg 768w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/Sympathikus-Cortisol-Stress-18x12.jpg 18w\" \/><\/div><span class=\"dpt-thumbnail-aspect-ratio\" style=\"padding-top: 75%\"><\/span><\/div><\/div><div class=\"sub-entry\"><h3 class=\"dpt-title\"><a class=\"dpt-title-link\" href=\"https:\/\/www.markus-schall.de\/en\/2026\/03\/sympathetic-nervous-system-parasympathetic-nervous-system-and-cortisol-how-stress-controls-our-body\/\" rel=\"bookmark\">Sympathetic nervous system, parasympathetic nervous system and cortisol - how stress controls our body<\/a><\/h3><\/div><\/div>\n\t\t\t\t\t\t<\/div><!-- .dpt-entry -->\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"dpt-entry has-thumbnail\" data-title=\"entgiften ohne nebenwirkungen? mein erfahrungsbericht mit humins\u00e4uren\" data-id=\"3057\"  data-category=\"allgemein b\u00fccher gesundheit tipps &amp; anleitungen\" data-post_tag=\"buch cmd erfahrungen gesundheit hypersensibilit\u00e4t mcs\">\n\t\t\t\t\t\t\t<div class=\"dpt-entry-wrapper\"><div class=\"dpt-featured-content\"><div class=\"dpt-permalink\"><a href=\"https:\/\/www.markus-schall.de\/en\/2025\/10\/detox-without-side-effects-my-experience-with-humic-acids\/\" class=\"dpt-permalink\"><span class=\"screen-reader-text\">Detox without side effects? My experience report with humic acids<\/span><\/a><\/div><div class=\"dpt-thumbnail\"><div class=\"dpt-thumbnail-inner\"><img width=\"1024\" height=\"683\" class=\"attachment-full size-full\" alt=\"Humic acids for gentle detoxification\" context=\"dpt\" data-dpt-src=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/huminsaeuren-moorboden.jpg\" data-dpt-sizes=\"(max-width: 1024px) 100vw, 1024px\" data-dpt-srcset=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/huminsaeuren-moorboden.jpg 1024w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/huminsaeuren-moorboden-300x200.jpg 300w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/huminsaeuren-moorboden-768x512.jpg 768w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/huminsaeuren-moorboden-18x12.jpg 18w\" \/><\/div><span class=\"dpt-thumbnail-aspect-ratio\" style=\"padding-top: 75%\"><\/span><\/div><\/div><div class=\"sub-entry\"><h3 class=\"dpt-title\"><a class=\"dpt-title-link\" href=\"https:\/\/www.markus-schall.de\/en\/2025\/10\/detox-without-side-effects-my-experience-with-humic-acids\/\" rel=\"bookmark\">Detox without side effects? My experience report with humic acids<\/a><\/h3><\/div><\/div>\n\t\t\t\t\t\t<\/div><!-- .dpt-entry -->\n\t\t\t\t\t\t\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\n<hr \/>\n<h2>Frequently asked questions<\/h2>\n<ol>\n<li><strong>What exactly does a modern smartwatch actually measure?<\/strong><br \/>\nA smartwatch measures far more than just heart rate and step count. It can record movement patterns, sleep patterns, breathing rate, heart rate variability (HRV), oxygen saturation and - depending on the model - even skin temperature or stress patterns. Much of this data is collected automatically without the user consciously starting or seeing it.<\/li>\n<li><strong>What is heart rate variability (HRV) and why is it so important?<\/strong><br \/>\nHRV describes the fine intervals between individual heartbeats. A high HRV is a sign of good regeneration and inner balance, while a low HRV indicates stress or exhaustion. This makes it a very meaningful parameter for the autonomic nervous system - and therefore for emotional and physical balance.<\/li>\n<li><strong>Can smartwatches or headphones really recognize my mood?<\/strong><br \/>\nNot directly, but indirectly: if several biosignals are analyzed simultaneously - e.g. HRV, respiratory rate, movement patterns and muscle tension - conclusions can be drawn about emotional states. Systems then recognize stress, tension, calmness or restlessness, for example. Although this data says nothing about specific thoughts, it does say a lot about inner states.<\/li>\n<li><strong>Who actually receives all this data?<\/strong><br \/>\nThis depends heavily on the manufacturer. With Apple, a lot of data is stored locally on the iPhone; with Google- or Android-based systems, the data often ends up in the cloud. With many third-party providers, especially in Asia, it is unclear where the data flows to. Depending on the app and device, third-party providers can also gain access - often by agreeing to terms and conditions that hardly anyone reads.<\/li>\n<li><strong>What is the problem with this permanent data collection?<\/strong><br \/>\nThe main problem is the long-term effect: over months and years, an increasingly detailed profile of the user is created - with habits, stress patterns, reactions and potential weaknesses. In future, this data could be used by insurance companies, employers or platforms to control prices, offers or decisions - even without the user's conscious consent.<\/li>\n<li><strong>How can I prevent my wearables from collecting too much data?<\/strong><br \/>\nThe easiest way to do this is to only wear the device when needed. Deactivate Bluetooth, location services and background updates if they are not needed. Check apps carefully and only grant necessary authorizations. In the settings of many devices, certain sensors can be switched off or access to certain data can be restricted.<\/li>\n<li><strong>Are headphones really able to measure biosignals?<\/strong><br \/>\nYes, modern in-ear headphones can measure blood flow in the ear canal or skin conductivity, for example. Some models also use small movement or voltage sensors to record breathing patterns or micro-reactions. These functions are often not openly communicated, but have long since been technically implemented - especially by major manufacturers such as Apple, Samsung or Bose.<\/li>\n<li><strong>What distinguishes Apple from other manufacturers in this area?<\/strong><br \/>\nApple relies on local storage, end-to-end encryption and a fundamentally more privacy-friendly strategy. Most health data remains on the device as long as the iCloud is not actively activated. However, Apple can also change its strategy - and access by the authorities can never be completely ruled out.<\/li>\n<li><strong>What about Google or Android devices?<\/strong><br \/>\nGoogle collects significantly more data and often processes it in the cloud. Devices such as Fitbit (owned by Google) also send data to central systems. Although there are data protection settings here too, many are activated by default - and are difficult to understand. In addition, Google's business model is heavily data-driven, which increases the risk of data being reused.<\/li>\n<li><strong>What about other manufacturers such as Garmin, Samsung or Xiaomi?<\/strong><br \/>\nGarmin stores a lot of data in the cloud, but has a sports-focused approach. Samsung combines its own services with Google systems - resulting in a mixture of local and cloud. Asian manufacturers such as Xiaomi and Huawei are less transparent. A lot of data ends up on servers outside Europe - often without clear user control.<\/li>\n<li><strong>Is it an exaggeration to talk about surveillance with wearables?<\/strong><br \/>\nNot necessarily. It is a kind of self-monitoring that is voluntary - but can very easily turn into external monitoring due to the technical structure. The more data is collected, the greater the interest of third parties in using this data. Whether for advertising, risk assessment or behavior recognition: the line is blurred.<\/li>\n<li><strong>Are there any health risks associated with Bluetooth headphones?<\/strong><br \/>\nThe research here is not conclusive. Many users report tingling, a feeling of pressure or hypersensitivity when wearing them for long periods. Even if the radio radiation is below the legal limits, the permanent proximity to sensitive nerve regions such as the inner ear can be unpleasant or stressful for sensitive people. It is therefore not paranoid to remain cautious.<\/li>\n<li><strong>Why do so few people realize what their devices are doing?<\/strong><br \/>\nBecause it happens quietly, automatically and in the background. The terms in the settings sound harmless (\u201esensor fusion\u201c, \u201eoptimization\u201c, \u201efitness data\u201c) - and the marketing images show healthy, happy people. So there is no unease. And what is not perceived as a danger is not questioned.<\/li>\n<li><strong>How can personality patterns be recognized from the data in the long term?<\/strong><br \/>\nBy combining biosignals over weeks and months, the software recognizes fixed reaction patterns: when someone feels stress, how they deal with stress, when they are calm, when they thrive. These patterns are individual and very meaningful - and could later become relevant for decisions in the insurance, finance or employment sectors.<\/li>\n<li><strong>What can I do if I have already disclosed a lot of data?<\/strong><br \/>\nFirst: become aware. Then check which apps have access and delete them if necessary. Export the data to the respective platforms (e.g. Google Fit, Garmin Connect) and stop synchronization. In some cases, you can also request the deletion of cloud data. And in general: be more selective with tracking from now on.<\/li>\n<li><strong>Is it realistic to live completely without wearables?<\/strong><br \/>\nOf course. People have survived for centuries without digital pedometers and sleep sensors - and many still do today. It's not about doing without, but about making a conscious decision. Anyone who wants to use technology can do so - but in a targeted way, not around the clock and not without knowing what is behind it.<\/li>\n<li><strong>Are there any devices or apps that are particularly data protection-friendly?<\/strong><br \/>\nYes, there are now open source projects, alternative fitness trackers without a cloud connection and apps that work completely offline. They are often less convenient, but much more transparent. Anyone who values data sovereignty can look for such alternatives - they are rare, but they do exist.<\/li>\n<li><strong>What was the main purpose of the article?<\/strong><br \/>\nIt was important for the author - in this case me - to explain. I use a Apple Watch myself and find the technology exciting, but I also see the risks. That's why I wanted to write this article: Because I see that many people are completely unconcerned about using devices that quietly collect intimate data. Not out of panic, but out of responsibility. It's about sharpening our focus - for what is invisible today but could be of great importance tomorrow.<\/li>\n<\/ol>\n<hr \/>\n\n\t\t\t<div class=\"display-post-types\">\n\n\t\t\t\t\t\t\t<style type=\"text\/css\">\n\t\t\t#dpt-wrapper-92 { --dpt-text-align: left;--dpt-image-crop: center;--dpt-border-radius: 5px;--dpt-h-gutter: 10px;--dpt-v-gutter: 9px; }\t\t\t<\/style>\n\t\t\t<style type=\"text\/css\">#dpt-wrapper-92 { --dpt-title-font-style:normal;--dpt-title-font-weight:600;--dpt-title-line-height:1.5;--dpt-title-text-decoration:none;--dpt-title-text-transform:none;--dpt-excerpt-font-style:normal;--dpt-excerpt-font-weight:400;--dpt-excerpt-line-height:1.5;--dpt-excerpt-text-decoration:none;--dpt-excerpt-text-transform:none;--dpt-meta1-font-style:normal;--dpt-meta1-font-weight:400;--dpt-meta1-line-height:1.9;--dpt-meta1-text-decoration:none;--dpt-meta1-text-transform:none;--dpt-meta2-font-style:normal;--dpt-meta2-font-weight:400;--dpt-meta2-line-height:1.9;--dpt-meta2-text-decoration:none;--dpt-meta2-text-transform:none; }<\/style><div class=\"dpt-main-header\">\n\t\t\t\t\t\t<div class=\"dpt-main-title\">\n\t\t\t\t\t\t\t<span class=\"dpt-main-title-text\">Current articles on art &amp; culture<\/span>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t<\/div>\t\t\t\n\t\t\t\t<div id=\"dpt-wrapper-92\" class=\"dpt-wrapper dpt-mag1 land1 dpt-cropped dpt-flex-wrap\" >\n\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"dpt-entry has-thumbnail\" data-title=\"apple im wandel: fr\u00fche ger\u00e4te, eigene erfahrungen und eine ausstellung im ocm\" data-id=\"5480\"  data-category=\"allgemein apple iphone &amp; ipad apple macos hardware kunst &amp; kultur stories &amp; humor\" data-post_tag=\"apple erfahrungen filemaker mac prozesse publishing\">\n\t\t\t\t\t\t\t<div class=\"dpt-entry-wrapper\"><div class=\"dpt-featured-content\"><div class=\"dpt-permalink\"><a href=\"https:\/\/www.markus-schall.de\/en\/2026\/03\/apple-in-transition-early-devices-own-experiences-and-an-exhibition-at-ocm\/\" class=\"dpt-permalink\"><span class=\"screen-reader-text\">Apple in transition: Early devices, personal experiences and an exhibition at the OCM<\/span><\/a><\/div><div class=\"dpt-thumbnail\"><div class=\"dpt-thumbnail-inner\"><img width=\"1024\" height=\"683\" class=\"attachment-full size-full\" alt=\"Apple Macintosh Classic and Color Classic\" context=\"dpt\" data-dpt-src=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/Apple-OCM-Titel.jpg\" data-dpt-sizes=\"(max-width: 1024px) 100vw, 1024px\" data-dpt-srcset=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/Apple-OCM-Titel.jpg 1024w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/Apple-OCM-Titel-300x200.jpg 300w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/Apple-OCM-Titel-768x512.jpg 768w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/Apple-OCM-Titel-18x12.jpg 18w\" \/><\/div><span class=\"dpt-thumbnail-aspect-ratio\" style=\"padding-top: 75%\"><\/span><\/div><\/div><div class=\"sub-entry\"><h3 class=\"dpt-title\"><a class=\"dpt-title-link\" href=\"https:\/\/www.markus-schall.de\/en\/2026\/03\/apple-in-transition-early-devices-own-experiences-and-an-exhibition-at-ocm\/\" rel=\"bookmark\">Apple in transition: Early devices, personal experiences and an exhibition at the OCM<\/a><\/h3><\/div><\/div>\n\t\t\t\t\t\t<\/div><!-- .dpt-entry -->\n\t\t\t\t\t\t\t\t\t\t\t\t<div class=\"dpt-entry has-thumbnail\" data-title=\"cancel culture im westen: sport, universit\u00e4ten, milit\u00e4r und eu-sanktionen analysiert\" data-id=\"5009\"  data-category=\"allgemein gesellschaft kunst &amp; 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kultur\" data-post_tag=\"denkmodelle deutschland energiepolitik eu-gesetze europa geopolitik krisen sicherheitspolitik spieltheorie\">\n\t\t\t\t\t\t\t<div class=\"dpt-entry-wrapper\"><div class=\"dpt-featured-content\"><div class=\"dpt-permalink\"><a href=\"https:\/\/www.markus-schall.de\/en\/2025\/12\/game-theory-explains-25-years-of-geopolitics-how-europe-lost-its-strategic-role\/\" class=\"dpt-permalink\"><span class=\"screen-reader-text\">Game theory explains 25 years of geopolitics: How Europe lost its strategic role<\/span><\/a><\/div><div class=\"dpt-thumbnail\"><div class=\"dpt-thumbnail-inner\"><img width=\"1024\" height=\"765\" class=\"attachment-full size-full\" alt=\"Game theory explains 25 years of geopolitics\" context=\"dpt\" data-dpt-src=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/europa-russland-spieltheorie.jpg\" data-dpt-sizes=\"(max-width: 1024px) 100vw, 1024px\" data-dpt-srcset=\"https:\/\/www.markus-schall.de\/wp-content\/uploads\/europa-russland-spieltheorie.jpg 1024w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/europa-russland-spieltheorie-300x224.jpg 300w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/europa-russland-spieltheorie-768x574.jpg 768w, https:\/\/www.markus-schall.de\/wp-content\/uploads\/europa-russland-spieltheorie-16x12.jpg 16w\" \/><\/div><span class=\"dpt-thumbnail-aspect-ratio\" style=\"padding-top: 75%\"><\/span><\/div><\/div><div class=\"sub-entry\"><h3 class=\"dpt-title\"><a class=\"dpt-title-link\" href=\"https:\/\/www.markus-schall.de\/en\/2025\/12\/game-theory-explains-25-years-of-geopolitics-how-europe-lost-its-strategic-role\/\" rel=\"bookmark\">Game theory explains 25 years of geopolitics: How Europe lost its strategic role<\/a><\/h3><\/div><\/div>\n\t\t\t\t\t\t<\/div><!-- .dpt-entry -->\n\t\t\t\t\t\t\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\n<hr \/>","protected":false},"excerpt":{"rendered":"<p>Wearables are now part of everyday life. Many people now wear a smartwatch as a matter of course, count their steps, monitor the quality of their sleep or set reminders to take breaks during the day. And I'm happy to admit it: I also have a Apple Watch myself, and I find this technology absolutely fascinating in its own way. It can do things that a few years ago ... <a title=\"Game theory explains 25 years of geopolitics: How Europe lost its strategic role\" class=\"read-more\" href=\"https:\/\/www.markus-schall.de\/en\/2025\/12\/game-theory-explains-25-years-of-geopolitics-how-europe-lost-its-strategic-role\/\" aria-label=\"Read more about Game theory explains 25 years of geopolitics: How Europe lost its strategic role\">Read more<\/a><\/p>","protected":false},"author":1,"featured_media":3564,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":356,"footnotes":""},"categories":[1,40,466,456,147],"tags":[10,469,447,448],"class_list":["post-3560","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-allgemein","category-apple-iphone-ipad","category-gesellschaft","category-gesundheit","category-hardware","tag-apple","tag-datenschutz","tag-gesundheit","tag-ratgeber"],"_links":{"self":[{"href":"https:\/\/www.markus-schall.de\/en\/wp-json\/wp\/v2\/posts\/3560","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.markus-schall.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.markus-schall.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.markus-schall.de\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.markus-schall.de\/en\/wp-json\/wp\/v2\/comments?post=3560"}],"version-history":[{"count":18,"href":"https:\/\/www.markus-schall.de\/en\/wp-json\/wp\/v2\/posts\/3560\/revisions"}],"predecessor-version":[{"id":3895,"href":"https:\/\/www.markus-schall.de\/en\/wp-json\/wp\/v2\/posts\/3560\/revisions\/3895"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.markus-schall.de\/en\/wp-json\/wp\/v2\/media\/3564"}],"wp:attachment":[{"href":"https:\/\/www.markus-schall.de\/en\/wp-json\/wp\/v2\/media?parent=3560"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.markus-schall.de\/en\/wp-json\/wp\/v2\/categories?post=3560"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.markus-schall.de\/en\/wp-json\/wp\/v2\/tags?post=3560"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}