I kept receiving error messages when measuring HRV from both supine and sitting positions, so I now take all measurements standing, and it works every time. My HRV was showing 100-110 very consistently, and I didn't seem to have any low-readiness days. Now that I have started taking these measurements standing, my HRV is in the 60s and 70s almost exclusively, and I receive low readiness a couple of times a week.
It seems that the pattern of fatigue goes in three-day cycles, where I will have a decently tough workout on day 1, receive an amber reading on day 2 (at which point I complete a moderate workout), and then a red reading on day 3. Is this relatively normal?
I practice weightlifting and wrestling 5 or 6 days a week, and compete internationally in wrestling (just a little background into the nature of my training).