HR not correct when doing an activity

Luca,

Please post in English. I don't think many of us here can understand the language you are writing in...

I apologize, but I have to use the translator, sometimes it translates independently.it works irrationally just like the Garmin!!!

I previously owned a Fenix 5 and the behavior was similar with inconsistency in the HR reading. Yesterday I run a Trail with a friend of mine, he was wearing a Sunto and in a very deep effort he was reading 80 bpm while I was nearly 175 .... this means it is a general problem, not just Garmin or 955, some have good results due to a well contact between wrist and watch others not.

Since two years now I do use a chest HR strap and I get correct values.

I am experiencing the same issue myself. I did a one-hour cycling workout, measured my heart rate using an Edge with a chest strap, and my maximum heart rate was 160. However, the heart rate on my wristwatch did not go above 80, so it did not count any intensive minutes for the entire workout. A few weeks ago, this worked without any problems, so it's likely a software issue. It's frustrating that more and more of these problems are occurring.

Also observed heart rate too low as well as too high: https://forums.garmin.com/sports-fitness/running-multisport/f/forerunner-955-series/327759/heart-rate-too-high-and-too-low-workarounds

It's not a fix, but I did find that stopping and resume the workout seems to fix a heart-rate-too-low problem.

Same issue here. It was not a problem with my FR245 and the 955 in the beginning. It started to appear with FW13.x and appears no matter how the watch is worn. So everything leads to this being a software problem. And not a word from Garmin. If this does not get resolved it is my last Forerunner.

We already have three threads describing the same problem and nothing is happening:

forums.garmin.com/.../hr-not-correct-when-doing-an-activity


https://forums.garmin.com/sports-fitness/running-multisport/f/forerunner-955-series/325155/what-is-going-on-with-the-hr-readings-since-14-13

forums.garmin.com/.../hr-issue-after-updating-to-13-22

we'll wait for the big update that should fix everything

Running into same issue on my side. Had a tempo and two anaerobic workouts in the last five days. Heart rate would not go over 150 for first anaerobic workout when I am regularly in the 170’s for sprint. Tempo, despite 80% effort for 30 minutes, my HR would not exceed 130s—typically 150s and 160s. Yesterday, when I did sprints, my heart rate went from 129 down (yes, DOWN) to 85 and held steady despite max effort. Resting between sprints, my HR fell to 65. All workouts showing as ‘Base Effort’ for the past week because of this which is destroying my training plan. 

Have the same issue, I contacted Garmin support they offered me “new watch” when i check fine print, its say the new watch is re certified watch, which is joke.