I'm curious about the principles behind how modern smartwatches measure heart rate and blood oxygen levels. How accurate are these readings across different skin types and movement intensities? And how do they transmit data to the phone without significantly draining the battery? What algorithms are used to reduce signal noise? I'd love to hear your thoughts and experiences on these topics.
How do health monitoring sensors work in modern smartwatches?
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I'm particularly interested in how motion artifact compensation works in real-time when measuring heart rate—do you use Kalman filters or other adaptive algorithms? And how critical is the impact of different skin tones on SpO₂ accuracy in your watches?