I've noticed that during some runs (not all runs), I get a huge spike in HR for about 10min, then it goes to "normal value". Below is an example of a recovery run that had this issue (pace was extremely easy, about 1:15 /km slower than marathon pace). The portion after the spike (~120bpm) is in line with the effort and activities where I don't get the spike:
https://imgur.com/DjwvopV
In comparison, today's track workout with no "bug":
https://imgur.com/DnbiAat
Since I wear a HRM strap, here's the HRV plot for the buggy run:
https://imgur.com/xogRO36
Something seems definitely off with that plot - during the bug, I seem to have two distinct HRV lines, then when it settles back down it gets back to normal...
Any idea what is the cause for this?
(Note: same pattern with wrist heart rate (no HRV during session though with wrist HR).
https://imgur.com/DjwvopV
In comparison, today's track workout with no "bug":
https://imgur.com/DnbiAat
Since I wear a HRM strap, here's the HRV plot for the buggy run:
https://imgur.com/xogRO36
Something seems definitely off with that plot - during the bug, I seem to have two distinct HRV lines, then when it settles back down it gets back to normal...
Any idea what is the cause for this?
(Note: same pattern with wrist heart rate (no HRV during session though with wrist HR).