HRV research, explained
Posts that walk through heart rate variability research: what the studies measured, who took part, and how far the results reach.
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HRV for doctors and health professionals: what your patients' wearables are telling them
Most wearables report RMSSD from a pulse sensor during sleep, and Apple Health stores SDNN from samples the watch takes on its own. Neither is the 24-hour Holter SDNN behind the risk studies. The number is a personal trend, best read against the patient's own baseline and never as a test.
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