As fitness wearables near ubiquity, resting heart rate poised to become 'vital sign of the digital age

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Comparing distribution of RHR overnight data in Fitbit vs. Apple

AK1980 Fitness Tracker, Activity Tracker Watch with Heart Rate Monitor Blood Pressure Blood Oxygen Sleep Monitor IP68 Waterproof Step Tracker Calorie

AK1980 Fitness Tracker, Activity Tracker Watch with Heart Rate Monitor Blood Pressure Blood Oxygen Sleep Monitor IP68 Waterproof Smart Watch Step

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Investigating sources of inaccuracy in wearable optical heart rate