Heart Rate Variability (HRV)
Why your nervous system score predicts everything — and what to do when it drops.
Track This Biomarker Free → ← All BiomarkersWhat Is Heart Rate Variability (HRV)?
HRV measures the variation in time between consecutive heartbeats, expressed in milliseconds. A higher HRV means your autonomic nervous system is flexible and responsive — you recover faster, adapt better to stress, and have more physiological reserve. A declining HRV trend is one of the earliest signals in Hunuu's LSTM model for detecting incoming illness, overtraining, or burnout.
Why It Changes
- Overtraining or under-recovery
- Poor sleep quality — especially reduced deep sleep
- Chronic psychological stress and elevated cortisol
- Illness — HRV typically drops 3–7 days before symptoms appear
- Alcohol — even moderate drinking suppresses HRV for 24–48 hours
- Dehydration and nutritional deficits
How Hunuu Health Uses This Signal
Hunuu tracks your personal HRV baseline using a Dynamic Personal Baseline (DPB) model — not population averages. A 15%+ decline from your personal 7-day mean triggers an Implicit Health Demand Signal (IHDS), initiating the 30-day predictive window.
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