Would have been interesting if you had logged your biodata with an Oura ring, or so. I'm planning on doing something like this to get out of a kind of fatigue and sleep problems. I also have a rowing machine, incidentally.
I only tracked data with my smartwatch, my resting HR was basically going down from over 100 to under 60 in 1 month. Oxygen level was 95-99% all the time, but I never got ScvO2/SvO2 measured in the hospital (some say LC folks have only 20-40% SvO2 which is ICU level).
Which watch? They're differing quite a lot in accuracy. Heart rate is mostly fine, but I wouldn't necessarily trust Oxygen or sleep phase tracking. https://www.youtube.com/@TheQuantifiedScientist