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Heart rate massively jumping during run

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‎09-19-2023 16:11

‎09-19-2023 16:11

On my last 3 runs my HR will stay quite low for the first 2 mins and then suddenly jump about 30 BPM in a second. I don't think my heart is actually doing this and I'm thinking there's an issue with the Fitbit?

 

Does anyone have any ideas? This displays the same in the Fitbit and Strava app and wasn't happening until a couple of weeks ago. I've looked at the gpx data and it is definitely a jump in 1 second.

Screenshot_20230919_180230_Strava.jpg

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