The fenix 5 series doesn’t do sleep HRV tracking. Body Battery (the thing that gives a 0-100 score) is not sleep HRV. Sleep HRV did get added to the Fenix 6 with the latest firmware but the fenix 6 has an older hr sensor so may not be as accurate as the newer generation watches.
The way you can get different results with elite HRV is why for the lazier people like me the automated sleep HRV method can be better. Its an average of the full night so most likely will be measured the same way. Changing how long after you wake or the position you are in (sitting, laying down, …) will cause it to measure different value. If you are good at following the same routine everyday it can be great and probably much better than the Garmin, but if not…
But I would say the main thing is that I don’t think anyone is arguing to use this one data point to drive all the training but that this data point can influence training when mixed in with other data points. (See the study in the first post) Also not saying that people need to figure out the trends in multiple data points themselves to figure out what to do, but that its automatically fed into the models that adaptive training uses to figure out what to tell you to do
Yes, seems pretty accurate with how it tracks with feeling worn out after pushing hard for multiple days and worn out. The whole training readiness concept that current garmin watches have overall seems good. And while I love data as its fun to look at, its better if actionable. So wish it was more actionable by being able to influence what TR tells me to do for workouts.
I strongly dislike the idea of overriding what adaptive training says I should do as that will probably hurt things in the long run. All adaptive training sees if I go easier is that I did something easy so should be in a better state to do something harder next. If I do something harder cause training readiness things I’m ready for it that could easily make adaptive training think my levels should be raised but if I’m only able to push that hard because my body was well recovered more than usual raising my levels could make future workouts harder than I’m ready for when not that recovered (i.e. my normal baseline)
Yesterday I did a very intense threshold workout (Smith - 1 5x10 min very close to threshold) and I am pretty sore but according to Elite HRV which I use with my Polar H10 my morning readiness score was 10 (usually it’s 8 sometimes 7 or 6), the highest it’s been in over a month (and that was on a holiday). I don’t even feel like doing Z2 today…
