I’m usually in the low 50s (HR) and I take readings pretty soon as much as I wake up, I’m talking about the ithlete.
The only problem (apart from sometimes the frustration of getting it to work) is sometimes a ±5 difference in subsequent readings.
My algorithm is: I take two and if they are pretty much the same (± 2) I keep that. If they are far off from each other, I keep taking readings and notice tendencies. For example:
80-72-78-78, that’s it, I keep 78.
HRV seems decently (inversely) correlated with HR.
I wonder how many of the people gathering HRV dataare doing real statistical analyses to look for relationships among variables. I think not many.