I started tracking HRV at the start of June. My rMSSD was in the high 30’s, but I was pretty messed up (a lot of my other readings were/are totally whack, including an insanely high LF). Lots and lots of only Endurance/Z2/MAF riding over the last 3 months has raised it to 90 (today). For my age group, 40-49, the median value is 30 and the range is 10-110, lots of wiggle room.
rMSSD has a high correlation with HF (rest & recovery), is that low as well?