my HRV device arrived yesterday and I have been wearing it for about 24 hrs. I had a cold shower and my HRV went from 48 to 30 and then some time after I did the Norwegian 4x4 interval training and my HRV went down about the same amount.
I have been sitting down and relaxing for about over an hour and my HRV is about 30 again.
In each case has my body responded in the correct manner?