But the real difference you (should) actually care about is the change to the heart rate sensor itself. See, the entirety of Whoop as a platform revolves around that heart rate sensor. Thus, if that heart rate sensor is inaccurate absolutely nothing else in Whoop's app matters.17 Nov 2021
How does WHOOP measure heart rate?
WHOOP Strain is measured on a 0 to 21 scale, which is based on the Borg Scale of Perceived Exertion. The more time you spend in your elevated heart rate zones, the higher your Strain will be. Strain does not operate on a linear scale, which means the higher your Strain goes, the harder you should push your body.20 Jan 2022