Going back to the HRV thing, the Garmin reddit indicates most users saw a drop in October/November without illness or lifestyle change which indicates Garmin did something with their algorithm. Whoop will have their own one. I use a Polar but they should all be measuring the same thing. Polar only measures it during sleep, too.
Going back to the HRV thing, the Garmin reddit indicates most users saw a drop in October/November without illness or lifestyle change which indicates Garmin did something with their algorithm. Whoop will have their own one. I use a Polar but they should all be measuring the same thing. Polar only measures it during sleep, too.