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abnormal high heartrate during activity

Lately i'm experiencing abnormal hearrates.

I'm running with my dog, the pace drops in the beginning are normal (pee stops from dog :) )

Point 1 is an abnormal peak of +30. I know my body well enough. These reads are wrong.

At point to I was fed up with high heartrate so i took of my watch for a few seconds.

Hearrate was reset and never went to the real level.

Not sure what the watch is showing here but it's certainly not my hearrate.

  • This is exactly what has been happening with mine. It used to happen only like once every three weeks, now it's happening almost every run. I get most of the run in at an accurate HR (around 145), then it will randomly jump crazy high (185) despite easy effort/no change in output or elevation (usually around the one hour mark, but sometimes it happens on shorter runs). I'll take it off, wipe it, and it will show somethings ridiculously low (68). Sometimes it will come back up to a normal HR after a few miles, but sometimes it just stays low. Super frustrating (Should note I'm wearing a Fenix 7)

  • I've been getting this on runs and the cardio activity (which I use for cardio and HIIT classes).   

    It's only happened with the wrist monitor on my FR 255.  About a week ago I got a chest HRM and it hasn't happened with that at all, not once. 

    Today for example - I did a HIIT class and I was working pretty hard at times, after warming up my HR from the chest HRM was between 90 and 112

    This morning I walked my granddaughter to nursery, pretty slowly she's only 3 1/2 and my peak HR  from the watch was 138 and the auto detected activity was walking and then 'Ellipitical (no idea what that is)

    The one thing my wrist HRM is good at measuring is my resting HR. Pretty accurate at an average 49