avg of -0.01. HRV also varied from min of 3 to max of 44 with avg of 12. HR varied from 88 to 126 avg and max 141. I am now 65 years old and used to compete at road and xcountry over 5k, 5M,10K,10Mile, half marathon and 20 miles at local,area,regional and national level events til 1998 when i retired due to OA of the knees.
I am however well impressed with the ECG function as it confirmed and picked up the few PVC’s i occasionally get when exercising