Chest rate strap HRM Pro heart rate data not used to plot heart rate graphic in Connect app

6841736 28 days ago

As can be seen graphic #2 (from chest strap, I suppose) , I spent only one minute in Zone 1, whereas graph #1 (matching watch audio alerts) shows me 18 minutes in Zone 1.

Why isn't the strap data used to plot the heart rate graphic?

0 trux 28 days ago

6841736 said:
As can be seen graphic #2 (from chest strap, I suppose) , I spent only one minute in Zone 1, whereas graph #1 (matching watch audio alerts) shows me 18 minutes in Zone 1.

No, image #1 shows that you've spent around 16 below Zone 1 and only around 2 min in Z1. Your Z1 starts at 85 bpm, and the graph during the first ~16 min shows HR of some 70 bpm most of the time.

0 6841736 28 days ago in reply to trux

My real heart rate was always above 100bpm, as this is x-country skiing. My Garmin 965 somehow kept wrong readings for 16 minutes!!! But why is the real bpm not showing in chart #1 as I was wearing my chest strap?

0 trux 28 days ago in reply to 6841736

Hard to tell, but I see basically three possibilities, either your HR was not as high as you think, or the strap was not connected, or the electrodes were dry, hence not broadcasting reliable data, and the watch switched to the internal sensor (which due to the cold weather, and the cold induced peripheral vasoconstriction could not record accurate HR either). You could perhaps see it better when you export the activity FIT file, and open it with https://www.fitfileviewer.com/, where you can compare the wrist HR, external HRM, and the resulting HR curves. That will show you which of the sources were used.

0 6841736 24 days ago in reply to trux

Hi Trux, here are my stats again. It seems the HRM strap got the right info, but why is it the wrong watch info that gets displayed on the heart rate graph?

0 6841736 24 days ago in reply to 6841736

These charts are from today and the same problem from last week occurred.

0 6841736 24 days ago in reply to 6841736

Now it is occurring to me that no info from the strap was sent out. (As I was 42 minutes out there and it only picked up the last 15 minutes.) Maybe my strap needs to be wetted before I start my activity

0 trux 24 days ago in reply to 6841736

6841736 said:
It seems the HRM strap got the right info, but why is it the wrong watch info that gets displayed on the heart rate graph?

Look at my previous reply - I listed there the possible reasons, and also the way you can see more clues with the fitfileviewer

0 6841736 23 days ago in reply to trux

Hi « Trux », thanks for your help. My problem was that I was not wearing the HRM properly. I was putting the « Garmin device » right over my heart and thus had no connector on my left chest! Because of the cold, I was not sweating enough but somehow the strap could function after 15-20 minutes, as sweat build up. I also never wet my connectors prior to skiing. But I am reassured now that the heart rate shown on my watch comes from the strap, which was my concern all along. Thus the audio heart rate alerts I get while x-country skiing or any other activity, when I wear my HRM strap, are effectively coming from the strap.

Thanks again.