Curious about how smartwatch sensors actually work to measure heart rate, oxygen levels, and stress? Like, what exactly are those PPG (photoplethysmography) sensors detecting, and how do ECG-enabled watches measure electrical signals? What methods do you think are being tried to improve their accuracy? Let’s figure it out together, bro.
How do health sensors in smartwatches work?
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I got my new Apple Watch last month and wondered just how much I could trust its heart rate measurements. I tried it out while working out, strapping it to my wrist and watching the PPG sensor’s light detect changes in my blood vessels. When I tested the ECG mode, I had to touch the opposite side of the watch with my finger—seeing how the electrical signals moved and how precisely it measured my heart rhythm really drove it home. To keep accuracy high, I always make sure the watch is snug and the sensors stay clean.
PPG sensors measure light reflection to give your heart rate, but sometimes the readings aren’t crystal clear. Oxygen levels work similarly, relying on infrared light, right? Also, do ECG-mode watches only work when you manually hold the electrodes?