Heart rate reading error

As of the last week or so, my fenix 6 seems to be significantly under-reading my heart rate for the first 10 mins or so of a work out, before then reverting to a 'correct' reading. See example below from 20 min indoor bike ride last night. And I'm seeing the same for other activities e.g. runs. Seems to hover below 120bpm for a while, despite pushing it, and then suddenly shooting up to 150 to160. I've used the watch a lot for running, know pretty much were I expect my heart rate to be, and this has never happened previously.

Anyone else seen this? Software glitch?

Thanks

Top Replies

Niterider4 over 1 year ago +1

This seems to be a common problem. Initially, people were reporting it with the backcountry skiing activity. Then people started reporting it for other snow sports activities. Then people started reported…

All Replies

0 Concy007 over 1 year ago

I have the same issue using the HRM dual connected to my Fenix 5x. Seems it measures around 80-100 for first 10mins then shoots up to 166 where I would expect it to be. Not sure what is going on.

0 Niterider4 over 1 year ago

This seems to be a common problem. Initially, people were reporting it with the backcountry skiing activity. Then people started reporting it for other snow sports activities. Then people started reported it for other activities. So I am wondering if it is more of a global problem than an activity-specific problem.

0 bmfang over 1 year ago

This happens for me on regular basis now with runs and power walks. If I want accurate HR data on them, I use chest strap or my other sports watch (Polar Pacer).

0 Concy007 over 1 year ago in reply to bmfang

To be honest I'm experiencing the issue with my strap as well. I'm hoping it's fixed soon. My data is getting skewed and hard to track calories burnt

0 sarge1701 over 1 year ago in reply to Concy007

I decided to get myself the heart rate strap - which based on the couple of runs I've done so far seems to be behaving as expected. But I won't be using the strap for e.g. MTB or Peloton rides, so still need the underlying issue to be fixed.

0 flocsy🤠 over 1 year ago in reply to Concy007

Wet your strap and be prepared that probably soon you'll need to buy a new strap

0 +tof over 1 year ago

Similar issue. This doesn't occur every time, based on day to day activity comparisons. I am tracking same activities daily.

0 AlexRcl over 1 year ago

I'have the same problem which is extremely annoying. The Forerunner 645 was providing excellent data if compared to the Fenix, I cannot believe I've paid 400E for an higher model which is a useless crap!

Anyhow, in the last 2 days I've connected a strap which is send data both to the watch and to my Edge 1030. The Fenix continue to show the internal sensor data on the main display, but if I switch to th HR widget it shows the strap reading, is it normal?
Of course it records only the HR data from the internal sensor: as result my EDGE showr an average HR for te WO of 150bpm (max HR 163bpm) and the fenix 110bpm (with a peack at 118).
This is insane, the display was showing the same data from the strap on both devices.
Now since in Garmin Connect the fenix is became by default the principal training device (it's impossible to set the EDGE as the principal), metrics like minutes of intensity all my data are trading down.

Any idea (a part from throwing away the watch?)

0 1736310 over 1 year ago

I had the same problem with stair climbing and my heart rate was only 75-100！My walking heart rate was always 80