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{"id":2868,"date":"2022-04-02T14:59:20","date_gmt":"2022-04-02T14:59:20","guid":{"rendered":"https:\/\/scienceandnerds.com\/2022\/04\/02\/how-to-measure-heart-rate-on-your-smartwatch\/"},"modified":"2022-04-02T14:59:22","modified_gmt":"2022-04-02T14:59:22","slug":"how-to-measure-heart-rate-on-your-smartwatch","status":"publish","type":"post","link":"https:\/\/scienceandnerds.com\/2022\/04\/02\/how-to-measure-heart-rate-on-your-smartwatch\/","title":{"rendered":"How to measure heart rate on your smartwatch"},"content":{"rendered":"

Source: https:\/\/www.theverge.com\/23004703\/heart-rate-ekg-smartwatch<\/a>
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Modern smartwatches have a wide array of heart-rate monitoring features. That includes passive all-day monitoring as well as spot checks for specific metrics. Some will even alert you if your heart rate suddenly spikes when it shouldn\u2019t. The most advanced devices also have FDA-cleared electrocardiograms that may help detect atrial fibrillation. <\/p>\n

These are impressive features considering that, just a decade ago, smartwatches were basically pedometers. In practice, heart rate monitoring can be a helpful tool for people hoping to understand more about their bodies or measure their fitness progress over time. For instance, some athletes prefer to train in heart rate zones \u2014 which is hard to do unless you can check it in real time. There have also<\/a> been<\/a> several<\/a> stories<\/a> of people who say their smartwatches saved their lives thanks to abnormal heart rate alerts.<\/p>\n

That said, it\u2019s important to remember that these aren\u2019t medical devices<\/a>. At the end of the day, they\u2019re not capable of diagnosing you with any sort of condition. And, even if they were, doctors are still on the fence<\/a> about how to handle wearable data that consumers collect on their own. <\/p>\n

There are nuances to how these features work and plenty of reasons why you might get inaccurate readings. <\/strong>First, we\u2019ll cover how heart rate monitoring works and how to measure your heart rate. Then we\u2019ll get into what EKG-capable smartwatches can and cannot do and how to use the EKG feature with the current crop of smartwatches.<\/p>\n

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The sensor array on the back of the Series 6 is capable of both EKGs and PPG heart rate monitoring.<\/em><\/figcaption>Vjeran Pavic \/ The Verge<\/cite><\/p>\n

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How optical heart rate sensors work<\/h2>\n

The vast majority of wearables use a photoplethysmography (PPG) sensor \u2014 the green LEDs you see when you flip the device over. The LEDs shine light into your skin; the light that\u2019s refracted back is translated by an algorithm into heart rate data. That includes your resting heart rate but also other metrics like VO2 Max and heart rate variability.<\/p>\n

While optical heart rate sensors have gotten better over the years, wrist-based PPG sensors still aren\u2019t always accurate. A recent study<\/a> found that these sensors didn\u2019t work as well on darker skin or people with obesity. The wrist is also not the best place for a PPG sensor. There\u2019s a lot of noise from your arm movements, and a company\u2019s algorithm has to be able to effectively filter that out. That\u2019s why you could wear the same smartwatch on each arm and still get slightly different readings.<\/p>\n

Fit is also an important factor. It varies from smartwatch to smartwatch, but here are a few general tips for getting the most accurate data possible.<\/p>\n