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Heart rate drops from 160 to 100 after 50 min running

Mica
8 days ago

Using Forerunner 255 (former user of Forerunner 235 for 7 years), noticied that after about 50 minutes running and reaching 160bpm, it suddenly went to around 100 bpm. 

Is it related to sensor? Outside temperature was about 18-20 degrees.

  • 0 6 days ago in reply to 6742038

    I have the same feeling. They keep introducing new functions, but they can't handle basic readings. Therefore, new functions based on these readings are also wrong. Heart rate spikes, I reset the watch during the run to get it back to normal. Interruptions in training recording or altitude spikes are standard. I wonder if it's only the watches from the Forreuner group that are so weak or if the entire Garmin has fallen so low.

  • 0 6 days ago in reply to global_local

    Also, you only have to google for "Apple watch HR problems" or "Huawei watch HR problems" to get loads of similar complaints. It's not only Garmin.

  • 0 4 days ago

    I've the same issue with a HRM connect via ANT during strength training. After around 40 minutes the the recording stops or it stuck at a HF number today it was 106  and then after a while 90.

    When I move the HRM a little the numbers came back but then it stops again.

    P.s. Can't run at the moment because of a muscle issue in my calf

  • 0 3 days ago in reply to unimatrixzero

    Some HRM straps turn off after a few minutes if they do not detect vertical movements. My HRM Run does this while my HRM Pro seems to stay on for the full activity.

  • 0 3 days ago in reply to ronand

    Oh, didn't know that.
    I've a HRV Dual from Garmin. I use that one since begin of the year during strength training, cause the optical sencor isn't made for this moves. But IMHO in the past the HRM worked as it should.

    Maybe it's the firmware version 22.24 which trigger this error. Maybe @garmin sierra is reading this here also

  • 0 2 days ago

    It also happens to me a few times per year and every time i remember me fixing the strap of my 255 either from being too loose, being to tight, or having caught part of a sleeve.
    The strange thing is that it does not recover by itself even if i remove and wear again the watch or pause it.  Most of the times if i stop and start a new activity it also keeps reading wrong HR.

    At least once after starting a new activity unsuccessfully, i rebooted it and still read wrong. Other times this is has fixed the issue.

    My advise: Just fix the watch strap properly and try not to mess with it while running.

  • 0 1 day ago

    this happens to me at least a few times every run using a brand new 255. my running cadence is around 160 spm and when operating in high aerobic my HR is often around there as well.

    i typically see several "events" in my run where the heart rate will drop from 150 or 160 to 120 with no warning, and then either jump back up if i adjust the strap, or slowly creep back up over several minutes. this problem existed with the forerunner 55, but is now completely out of control with the forerunner 255, ruining the HR data on most workouts. at this point my 55 is the superior device for hr monitoring despite having what is usually described as a "simpler" optical HRS.