Has anyone with a uterus noticed any correlation between their heart rate variability and menstrual cycle?
I've only had my Charge 4 for a bit over a month, and I'm using the free version of the Fitbit app so I can only see HRV data for the past 7 days. I don't check my HRV very often but when I do, I usually see fluctuations from day to day but the numbers are typically in the normal 50-100 range. Then a couple days ago, I saw a wierdly very gradual drop from 100 to 40. It freaked me out a little because when I looked around, it says everywhere that a consistent drop in HRV is associated with increased stress (which is not my case, I'm not stressed at all) or incoming illness. Then I had a few days of missing HRV data (which happens often), and today it's back at 90. This makes me wonder if the menstrual cycle has anything to do with HRV (the same way it does with HR), because the drop that I saw coincided exactly with my period. Would love to hear if anyone else noticed the same pattern :).
