So I've owned this Forerunner 165 for about one month. I wear it daily and only take it off to shower. My recorded resting HRV (during sleep it says) was ranging from like 55ms to 62ms every night. I recall my watch installing an update last week (21.20). The last 5 days my HRV has dropped dramatically into the 42ms - 45ms range. I understand that healthy HRV is typically above 60ms.
Since low HRV very highly correlates to risk of heart disease, this is obviously alarming. Because the watch uses HRV to help measure your "Stress" levels throughout the day I'm also concerned. One of my sleep periods was actually not recorded, and the watch claims I was having low to medium level stress that entire time period.
Has anyone else noticed any sudden dips/changes in HRV readings with their watch the last week or so? This thing is recording stress while I'm relaxed in my recliner watching an amusing TV show!! I guess I'm just curious if the update altered something, or if my HRV is actually tanking.
Current Version: 21.20 (App says I'm up to date)