Unverified50% confidenceFactExact time
Apple Watch uses a photoplethysmography (PPG) sensor to monitor heart rate, illuminating the subcutaneous capillaries of the wrist with green LED light and calculating real-time heart rate by leveraging hemoglobin's absorption characteristics of green light.
1
Sources
50%
Confidence
Long-term
Relevance
9/5/2026
First Seen
Sources
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