I've been wondering lately how popular smartwatches collect health data like heart rate, sleep tracking, and step count. Are these measurements taken via sensors, or do algorithms rely heavily on estimates? How accurate are these readings anyway?
Do smartwatches actually work?
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Thanks for the clear overview! From what I’ve seen, the heart-rate monitor uses a PPG optical sensor, and steps or sleep are tracked with an accelerometer, with firmware algorithms smoothing the data—have you noticed any big accuracy differences between specific models?