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How Apple Watch, Fitbit, Garmin, Oura, and Whoop Compare on Measuring HRV and Resting Heart Rate

We may earn a commission from links on this page. Heart rate variability (HRV) and resting heart rate (RHR) are the metrics that most wearables’ “recovery” numbers are based on. I wore five devices to bed for two weeks to see how their readings compared. Those devices were an Apple Watch Series 10, a Fitbit Charge 6, a Garmin Forerunner…