Dramatical incorrect OHR values

I training wakesurf twice are week and usually use HRM to monitor my HR.

Because good wakesurf app does not exists I use modified SUP activity and I wonder when i drop to water and HRM inaccessible and watch get data from OHR values dramatically incorect.

For example I have 170bpm and after drop watch show 60bpm. It's totally impossible.

Because I manually sync HR data after activity alwayes activity stored twice.

This is stored activity immedianly after:

https://connect.garmin.com/modern/activity/7333344032

And this after sync with HRM:

https://connect.garmin.com/modern/activity/7335377711

Look to drops on first grapth and totally incorrect values. By HRM by HR never drop bellow 100bpm and aboce 130-140bpm during active surfing.

Once I forgot my HRM and use only OHR and this values unbelivable very low:
https://connect.garmin.com/modern/activity/7374397299

Watches during activity wear very tight. So, why values so different and now about HR values during day and other activities.
Could you fix this bug? This is software bug or hardware problem?

Top Replies

schmjoe over 3 years ago +1

Not quite sure if this has anything to do with Garmin. If you search for issues with heart rate measurement on wrist you will find a troubleshooting guide from Suunto, Polar, Garmin, etc. i.e. it seems…

All Replies

0 matej787 over 3 years ago

This problem is 2 years old, and Garmin wont or cant fix it. It is a shame.

0 EgoIcti over 3 years ago in reply to matej787

Sadenly :((((

0 schmjoe over 3 years ago

Not quite sure if this has anything to do with Garmin. If you search for issues with heart rate measurement on wrist you will find a troubleshooting guide from Suunto, Polar, Garmin, etc. i.e. it seems that it is rather a limitation on the way this is done than an issue with specific hardware.

Why You Should Be Skeptical About Your Wrist-Based Heart Rate | Trail Runner Magazine

Just my 2cts.

0 subra over 3 years ago

EgoIcti said:
Could you fix this bug? This is software bug or hardware problem?

No, it's a systemic problem of OHR measurement.

It's because working with the arms affects blood flow by tightening and loosening the muscles in the wrist. Therefore, the OHR is usually not suitable for this type of activity, as well as push training in the gym.

0 bluefish over 3 years ago

Apart from the heart rate: which distance is correct ?

0 TobiasLj over 3 years ago in reply to bluefish

bluefish said:
which distance is correct ?

I would say the first one, the second is from the course. Ran a course today with a calibrated Stryd, longer isn't always the truth :-)

0 bluefish over 3 years ago in reply to TobiasLj

I would say the longer (gpx) distance is correct. I just converted the fit file of his activity into a GPX with connect and imported it back as track into Connect. The original fit of an activity is always shorter than the real distance.

0 TobiasLj over 3 years ago in reply to bluefish

bluefish said:
The original fit of an activity is always shorter than the real distance.

The GPX track points are from the FIT file and are far from perfect. The total distance shown for an activity is based on GPS data with filters applied to reduce GPS errors and to create consistency.

I don't say that the distance, as Garmin calculates it, is correct but neither is distance based on only GPS data. If I do the same I also get a longer distance but I known it is wrong. I didn't run that long and I'm not that fast :-)