problem with heartbeat measurement since 5.10 fenix 5

since update to 5.30 (I thought I had 5.10 but is 5.30) my wrist based heartbeat measurement gives jumps to high bpm then drops and stays as a flatline on tbe same heartbeat. when i take off the watch and out one again it works again but with strange measurements. . started this behavior since update.
ciq.forums.garmin.com/.../1244762.png ciq.forums.garmin.com/.../1244763.png ciq.forums.garmin.com/.../1244764.png

0 Heidstocker over 7 years ago

They introduced an issue with the current version. It's discussed over in the 935 forum and Garmin already acknowledged the bug and they are working to solve it:

https://forums.garmin.com/forum/into-sports/running/forerunner-935-aa/1243498-heart-rate-issue-since-5-3-update

0 RonM61 over 7 years ago

I have installed the beta. will check if it is solved this weekend

0 Former Member over 7 years ago

With the 5.3 update I'm seeing OHR data when doing open water swimming. Wrist based heart rate was NOT being recorded in the previous firmware. In fact, the Garmin support pages say that OHR is not accurate in the water. Sounds like another defect in the 5.3 firmware.

0 Dr Phil over 7 years ago

There have been reports virtually since the release of the device about HR being reported in the water. It happens. Ignore it.

0 RonM61 over 7 years ago

beta 5.33 does not fix everything. very strange jumps in heartrate in the beginning. this is not normal behavior.

see attached screenshots.

can i go back to 4.10?ciq.forums.garmin.com/.../1245322.png

0 mcalista over 7 years ago

beta 5.33 does not fix everything. very strange jumps in heartrate in the beginning. this is not normal behavior.

see attached screenshots.

can i go back to 4.10?

The first screenshot looks pretty normal - there's an upward curve in the 1st 10 minutes, which is exactly what you would expect with cardio drift. There is a short spike at about the 2 minute mark (probably where it locks onto your cadence?) but it quickly corrects itself, so not really a big deal.

The 2nd screenshot is more concerning, as it doesn't show a smooth curve, but spikes and even some dips in the 1st 10 minutes before it settles down. Did you let the HR sensor get a solid lock on your HR before your workout? Did you tighten or adjust the stap at 10 minutes? I also notice that it says Bike First - many cyclists find vibration from the handlebars an issue with getting accurate measurements from wrist HR sensors.

Either way, this is not showing the faults that were typical in the 5.30 software.

0 RonM61 over 7 years ago

Hi, thanks for the reply. I wear the watch 24/7 so I guess it locks on my HR. You are correct that I started with Biking first. I adjusted the strap before leaving. am biking a lot but did not see this spikes before.
I saw with one of the comments on the 935 forum for the same issue, he also noticed a spike after installing 5,33 and just after starting the activity. that's why I also mentioned this.

Will give it a try this week and on Saturday during my first 1/8 triathlon ;-))

Ron

0 marrr over 7 years ago

Its actually really useless, the red is my Edge 800 with hrm strap, overlay is Fenix 5 with OHR and 5.4 firmware.ciq.forums.garmin.com/.../1247626.png

0 SteveCRunner over 7 years ago

beta 5.33 does not fix everything. very strange jumps in heartrate in the beginning. this is not normal behavior.

see attached screenshots.

can i go back to 4.10?

5.4 doesn't fix it either. I had strange behaviour at the start of a session yesterday even with 5.40 software. I have since uninstalled any apps and CIQ data fields to see if the problem goes away.ciq.forums.garmin.com/.../1248624.gif

0 thr4 over 7 years ago

^ ^ ^
This looks like a OHR "lock" issue though - quite common actually