I recently switched back to my Garmin strap heart rate monitor because I found the accuracy of the wrist sensor on my Forerunner 935 to be poor. With the strap I am getting much more authentic-looking heart rate statistics. However, the HRV plots all have a 8-12 minute section at the beginning that looks very different than the rest of the plot and different than other examples I have seen.
Has anyone seen anything like this or can offer a possible explanation?
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