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While running, Heart rate bug as long as the Performance Condition notification has not been displayed

Every time I run, the heart rate displayed by my Fenix 5 plus (17.30) is false as long as the Performance Condition Notification as not been sent (usually after 5 to 10 min running).

Let me explain. My Max Heart Rate  is around 175.

  1. I start to run ==> After 1 min the Heart Rate displayed is very high (between 160 and 175), although I run very cool.
  2. So I stop ==> after 5 secs the heart rate displayed becomes normal (~110)
  3. I restart to run ==> the heart rate displayed becomes back very high again (~180) ==> I stop, it becomes normal ==> I restart, it becomes very high again.

I did this, 4 times and it is always the same.

After 6 minutes I received the Performance Condition notification ==> as the heart rate was very high, the Performance Condition is very low (today -19 !!!)

  • But, then, after this notification, the displayed heart rate becomes normal (around 120) until the end of my running.

I'm pretty sure there is a heart rate bug while the notification has not been shown.

And  I wonder if the heart rate displayed would not, in fact, be the pace, as long as the notification was not sent. Because, at the moment, I work to increase my mean pace. Usually, I start around 160 and increase my pace above 180.

Did you experience this bug ? And shall Garmin Support fix it ?

  • I forget to say that I used an ANT+ heart rate sensor

  • To make things short you  use a heart rate strap and the results are wrong in the beginning and correct later during the run? Then you should wetten your strap properly before running as mentioned in the manual.

    If this is not the reason, there are lots of other options: empty battery, strap does not fit right, broken strap etc...

  • "results are wrong in the beginning and correct later during the run" : Yes but the thing is that it becomes OK always at the moment just after the Watch displays the performance condition notification. I don't believe in coincidence. Especially since I checked and wet my belt to be sure that it didn't come from that

  • You can see, the wrong Heart rate until the Perforamnce condition notificationYou can see here the wrong Heart Rate until the Performance Condition notification. It really became OK at the moment of the notification