Smartwatches typically measure heart rate using photoplethysmography (PPG), which relies on green light reflection. LEDs on the back of the device emit green light onto the skin, and sensors detect changes in light caused by the expansion and contraction of blood vessels. This data is processed by a microprocessor and converted into heart rate readings. Some models also use electrodes to capture electrical signals. Which sensor type do you think is more reliable?
How do heart rate sensors work in smartwatches?
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Do electrodes work the same as green light sensors? I mean, which would be more reliable for my health concern, especially if I happen to hit my wrist badly and can't move my arm?
So, when buying a simple smartwatch for my mom's 60th birthday, how reliable is the heart rate sensor?