Sleep
RMSSD HRV Metric
RMSSD (root mean square of successive differences) is a common HRV time-domain metric reflecting short-term parasympathetic activity—higher values often mean better recovery readiness in athletes, though individual baselines vary widely. Wearables estimate RMSSD from PPG; lab ECG is more precise.
RMSSD (root mean square of successive differences) is a common HRV time-domain metric reflecting short-term parasympathetic activity—higher values often mean better recovery readiness in athletes, though individual baselines vary widely. Wearables estimate RMSSD from PPG; lab ECG is more precise.
Sudden multi-day drops matter more than one low night.
Related terms
Put RMSSD HRV Metric into practice
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