I'm curious, how do smart band-type devices calculate data like heart rate, sleep analysis, and stress levels? How reliable are these data? Wouldn't there be a risk of error if we make health decisions without consulting a doctor? What are your thoughts on this?
How accurate are smartwatches when it comes to health data?
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Heart rate sensors typically estimate heartbeats using photoplethysmography (PPG) with green light, while sleep analysis relies on movement and heart rate variations. This data is useful for general trends, but medical diagnosis requires a doctor's evaluation!
Sensors measure heart rate through light absorption (photoplethysmography), distinguish sleep using motion sensors + heart rhythm, and break it down into deep/light sleep. For stress, most models estimate it via skin conductance (EDA) and heart rate variability—these readings are usually 70-90% accurate, but can be thrown off by exercise or sweating. Watches typically run on their own algorithms, which aren’t as precise as a doctor’s, so they should never be the sole source in serious cases.