I used a whoop for about 5-6 months in the fall which also gives an HRV reading. I found that it rarely didn’t line up with how I was feeling and was pretty predictable. If I stayed out late drinking the night before then my recovery was in the toilet. If I stayed in and got to bed early during a recovery week then my recovery was very high. At the end of a really hard week it was lower.
So I could basically look at a plan and chart a predicted HRV score through it and it would be pretty close. As a result, I never found that I was moving workouts around based on the readings it was giving me. Maybe this would have changed if I was a pro and had nothing else dictating my schedule other than how I was feeling. But with work and other responsibilities, I found that trying to adjust training based on my HRV just added another layer of work and stress that I didn’t want to deal with. Also, I wasn’t going to just waste a free Saturday with nice weather because I got a bad score. I was going to go out on my MTB regardless. Was that the optimal choice? probably not. But its fun and is a break psychologically.
However, I found it did help me to see how much alcohol, lack of sleep, and dehydration really screwed me up, so it did help me trend those things in a better direction. In the end, it did teach me something that will overall help my training and performance but I found it didn’t help with the day-to-day adjustments.
Sorry if that was a little rambling…