Diets · Metabolic & Cardiometabolic
Does low heart-rate variability signal a higher risk of dying?
The claim, precisely: low heart rate variability correlates with all-cause mortality
Yes — a strong association, but it flags risk rather than being proven to cause it.
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: Population patterns (Observational)
How the studies fall
What the evidence shows
Low heart rate variability is a strong independent predictor of mortality after myocardial infarction (landmark Kleiger 1987). Independent of the lipid debate; supports HRV as a meaningful autonomic-health readout (relevant to wearable-based tracking).
The evidence (3)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Kleiger RE, et al. 1987 · Am J Cardiol | observational | supports | moderate | 808 post-MI patients: low SDNN (<50ms) ~5.3x mortality risk vs >100ms - strongest Holter predictor |
| Dekker 2000 2000 · Circulation | observational | supports | high | [FT-verified] Dekker ARIC n=14672 low HRV -> elevated CHD+all-cause death independent |
| Kleiger RE, et al. 1987 · Am J Cardiol | observational | supports | high | Landmark post-MI n=808 HRV<50ms vs >100ms RR=5.3 mortality independent of EF |
Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.