How do 'Smartwatches' track heart rate?
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8 months ago Created 8 months ago 0 reply / 0 comment Public discussion
Simran Kaur 8 months ago
They use 'Photoplethysmography' (PPG)—green LED lights that detect blood volume changes in your wrist. While great for trends, they are not a substitute for a medical-grade ECG.
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