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lnRMSSD HRV Metric
lnRMSSD is log-transformed RMSSD for smoother HRV trends—compare within your history, not across athletes or brands.
lnRMSSD is the natural logarithm of RMSSD—common on Oura and research exports because it normalizes skewed HRV distributions for trend analysis. A one-point lnRMSSD move is not comparable across people; track your rolling average and coefficient of variation.
Wearables estimate from PPG with more noise than chest ECG. Sudden week-long drops matter more than daily wiggles.
Common questions
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Is higher lnRMSSD always better?
Higher than your baseline usually suggests better parasympathetic tone, but individual ranges differ. Illness, alcohol, and overtraining suppress lnRMSSD below your norm—that is the actionable signal.
Related terms
Put lnRMSSD HRV Metric into practice
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