doug in co wrote:
in my experience, you will find far better and more easily interpreted value in sticking with a single heart rate variability test: each morning, at the same time, under the same conditions.
That's why I gave up on HRV4Training. My first attempt at HRV, particularly since it was free.
I don't get up at the same time every day due to the obligations of that day. Even on weekdays. And I'm not going to pick the earliest time I wake up regularly, then wake up at that time every day just to take a reading, then go back to bed. That'd be around 4AM. The loss of sleep from doing is not a cost I'm willing to pay. Conditions are also not the same. This might be good for someone with the luxury of having a perfectly consistent routine. Life gets in the way of that for me.
I'd much rather pay a premium to have some device record all the time then figure out for me which periods should be sampled to get the best data.