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FR965 heart rate sensor issue. Inaccurate data following uphill run, not exceeding 140bpm.

Tony G. Armin
9 months ago

It's quite unusual my Garmin Forerunner 965 did not surpass 140bpm during a 5km uphill run, on previous lower market watches I am accustomed to higher heart rates during such workouts. 

  • 0 9 months ago

    Is the watch firm enough on your arm? Isn't it moving too much on the arm?

  • 0 9 months ago in reply to flocsy🤠

    Yep tightened to be sure, but seems to be the case with every workout

  • 0 9 months ago in reply to Tony G. Armin

    Strange. I have fr965 for a year and I don't see a problem in general. The only persistent issue I know about is one that is known to be with the optical HR sensors, that it lags a few seconds because of the way the algorithm smooths out the numbers. This is not noticeable during "regular" runs, but is during quick short intervals. In my case we do a short (45sec) uphill sprint, and when I stop at the top and start to walk down I can still see that my HR is increasing. I'll add that this was one of the reasons I bought a Polar H10, and it's better when I wear it, though I can still see this for a shorter period of time, I guess with age another issue gets into the picture: the time my heart needs to react.

    Can you record a workout with both watches and show us the difference?

    How sure you are the old cheap watch was right and the garmin isn't?

  • 0 8 months ago in reply to flocsy🤠

    Hi, 
    I have a Polar H10 and the issue I have is that it disconnects after a while. Initially I thought it's the Polar H10, but brought it to service and it's the same. 

  • 0 8 months ago

    Any solution to this problem?

    git the same issue with my new fr965

  • 0 8 months ago

    had a similar issue with couple workouts. the bpm wasn't going up. i tried to move it around on my wirst or wipe the sensor which worked for a bit but at times it was like getting "stuck" at certain bpm.