HRV Truth Serum: Which Wearables Are Accurate at Night? (Oura vs WHOOP vs Garmin vs Polar)

Описание: Best Wearable for HRV? New Study Validates Oura, WHOOP, Garmin & Polar vs ECG (Sleep Data)
 
Is your nightly HRV actually real… or just wearable noise?

 
A new open-access validation study in Physiological Reports (Aug 2025) compared nocturnal resting heart rate (RHR) and heart rate variability (HRV, RMSSD) from five popular consumer wearables against an ECG reference (Polar H10 chest strap) across 536 nights in real-world home sleep conditions (13 healthy adults).
 
Devices tested:
 
Oura Ring Gen 3
 
Oura Ring Gen 4
 
WHOOP 4.0
 
Garmin Fenix 6
 
Polar Grit X Pro
 
Key takeaways (biohacker translation):



• RHR was generally solid across devices during sleep (Oura strongest).


• HRV is where accuracy separates: Oura (Gen 4 & Gen 3) came out closest to ECG, WHOOP was acceptable for trends, while Garmin and Polar showed lower concordance for HRV in this dataset.


• The real play isn’t obsessing over one night — it’s using trend tracking (7–14 day averages) and making decisions off patterns, not vibes.


 
Educational only — not medical advice. Wearables aren’t diagnostic tools.
 
Comment HRV with what device you use and whether your numbers match how you feel.
 
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