Sup folks,

I’ve been tracking my HRV the last month or so and I’ve found that typically it hovers around 60-80ms, which has corresponded with me generally feeling pretty fatigued. It’s the end of my season and I’m pretty tired from a big year and am definitely looking forward to some rest. However, randomly about 2 weeks ago I had a 2-day span where my HRV was in the 150-175ms range and I felt absolutely fantastic – demolished my 40 min wattage PR by like 15w. I cannot for the life of me figure out what I did to seemingly randomly jump from like 60ms to 150ms overnight. My sleep was in the fairly normal range right before that and I didn't eat anything special or whatnot and it wasn't even really a recovery day. In fact, I had my lowest HRV score last week the day after taking an easy day!

Does anyone with more experience in HRV training and measurement have any insights as to how one may be able to increase HRV or why it might jump like that? I’m a Cat 1 cyclist and a former 15:00 5k’er so I’ve been an athlete long enough to know the obvious stuff (good quality sleep, eating generally well, etc.) but I’m wondering if anyone has any non-obvious insights.