I’ve only been a WHOOP member for about three weeks, so I assume my device is still calibrating, but I had a question for the group.
I’ve been measuring HRV since 2019 using other wearables like Oura and Coros for overnight measurements, and I also take morning spot measurements with HRV4Training and HRV Elite. Over the years, my baseline HRV across all devices has consistently been in the 25–45 range.
Since using WHOOP, my HRV has mostly been measured in the 30s and 40s, which aligns well with my baseline. However, I’ve also seen occasional spikes up to 144, 136, and 89. Oddly, WHOOP interprets these spikes very positively and tells me I should “crush it” that day—even though these values are far above my normal baseline. Then, the following day, I might get an HRV reading of around 35 (which is actually normal for me), but WHOOP significantly downgrades my recovery score.
I understand that WHOOP and Oura measure HRV differently—Oura uses an overnight average, while WHOOP appears to rely heavily on a specific overnight window, possibly during REM sleep. I’ve also seen other users post their stats (see below), and there can be huge differences between “Lowest HRV” and “Highest HRV.”
What are everyone’s thoughts on this? Do you think these are incorrect or artifact-driven measurements? Do they end up skewing your recovery scores as well? Or is this simply part of the calibration phase? Yes, I have made sure the band is tight, two fingers from the wrist bone, tried different wrists. Reviewed all the support to confirm the fit is correct.
