A recent study of WHOOP by the Univesity of Arizona and published on PUBMED/Journal of Clinical Sleep Medicine, concludes that…
In healthy people, wearables can improve sleep quality and accurately measure sleep and cardiorespiratory variables.
Whilst that is superficially GOOD. Let’s dissect it a little
- The study did show that WHOOP’s heart rate and breathing algorithms were accurate to +/-1bpm at resting (sleep) levels. That’s good to know but I assume not spectacular compared to competitive products.
- The study also showed, to 95% accuracy, that using WHOOP did lead to an improvement in sleep quality as measured by PROMIS Sleep Disturbance – which is based on PATIENT RECORDED OUTCOMES.
- Surprisingly it also showed low errors of deviance from sleep stages measured during polysomnography. Although that does assume that the latter is correct.
Finally, I’m not sure if there was an equally-motivated control group who were given instructions in another format on how to increase sleep quality.
Must Read: Check out the latest WHOOP Review
https://the5krunner.com/2025/10/31/2026-whoop-5-0-mg-review-discount-accuracy-strain-recovery-athletes/
Last Updated on 21 January 2026 by the5krunner
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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors.
