Eric Topol: Wearable HRV and Readiness Scores Lack Evidence for Health Benefits
EricTopol · x · 2026-09-22
Eric Topol's Ground Truths newsletter critiques wearable HRV and readiness scores. On Sept 9, Apple revamped the Apple Watch health sensing system, adding a 0-10 Readiness score and boosting HRV sampling 24x, plus a new longevity tab and "Health Age."
Key points:
- Over 100 million US adults use wearables, yet HRV/Readiness scores are marketed as markers of autonomic nervous system health, future disease, biological age, and longevity — none of which is proven
- HRV is only a rough reflection of autonomic activity, inadequate for judging ANS dysfunction
- A long list of confounders (besides device, signal, filtering, capture duration, artifacts) affects HRV readings
While low-HRV associations with clinical outcomes have been studied for 30+ years, Topol argues evidence for actual health benefits remains a gaping hole.
Related event: Eric Topol Questions Wearables' Readiness Scores(2 posts)→
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