I'm interested in how the built-in health sensors in smartwatches work. What measurement methods are typically used (e.g., optical heart rate, accelerometer) and how accurate are the data they provide in daily life? Are there differences in how raw data is processed into the displayed values? How reliable do you find these measurements for long-term training?
How do the health sensors in smartwatches work, and which data can be trusted?
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Dude, smartwatches usually have optical sensors for heart rate using red light and an accelerometer, but sometimes I can't find anything reliable, so I can't decide if the data is 'legit' or 'fake' 😂. Honestly, there are algorithms converting raw data to displayed values, and while it's not super consistent in long-term training, you can kind of think of it as a 'new friend' 😉
Interesting how exactly optical heart rate measurement works during fast movements—does your smartwatch use a special filter to reduce artifacts? And how much does the sampling rate of the acceleration sensor affect the accuracy of activity analysis in long-term training?
Thanks for the detailed question! Most smartwatches use optical heart rate sensors (PPG) and accelerometers, where raw PPG data is often filtered and combined with motion correction algorithms—this often explains the differences between measured and displayed values. How important is absolute accuracy versus trend stability for your long-term training?