I tested 2 apps to record morning HRV. I used both apps first thing in the morning for 2 weeks, alternating which app I used first. There are several different measures of HRV, and I used rMSSD because it was common between the 2 apps and is commonly used to report HRV.
I got very different HRV values for the 2 apps.
Elite HRV measured a lower mean HRV that was much less variable than My Ithlete. The latter uses a shorter (1 minute) measurement window versus Elite (2 minutes, after calibration).
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