Fenix 6s heart rate issue with Tennis.

Heart rate is extremely low (avg 90-100) when I set activity to be tennis. I saw several other people mentioning the same issue, how is this still not being looked at?

As a test I played tennis for an hour and recorded it in 2 types of activities:

30 mins tennis activity: avg HR 103 bpm
30 mins cardio activity: avg HR 139 bpm

i got this watch because it has tennis as an option so that i don't need to manually edit it every time. But it's not even working smh

Top Replies

Ɛpsilon over 3 years ago +1

HR Strap. Tennis, with a lot of wrist flexing, would be problematic for wrist HR - or wear your watch temporarily on the other wrist and see if that behaves?
schmjoe over 3 years ago +1

WHR is not really reliable during activities and differs depending on the activity (independent of the watch you are using).

How accurate are wearable heart rate monitors? - Harvard Health

If you want…
JiayouJonman over 3 years ago +1

Identical issue. This is not an issue of the mechanics of tennis, but an software error in the “Tennis” sport settings. Prior to Garmin introducing Tennis as a sport option, I tracked activity while playing…

All Replies

0 flocsy🤠 over 3 years ago

what is your heart rate when you do the same physical activity but with another watch activity?

0 Ɛpsilon over 3 years ago

HR Strap. Tennis, with a lot of wrist flexing, would be problematic for wrist HR - or wear your watch temporarily on the other wrist and see if that behaves?

0 schmjoe over 3 years ago

WHR is not really reliable during activities and differs depending on the activity (independent of the watch you are using).

How accurate are wearable heart rate monitors? - Harvard Health

If you want reliable results: HR strap.

0 JiayouJonman over 3 years ago

Identical issue. This is not an issue of the mechanics of tennis, but an software error in the “Tennis” sport settings. Prior to Garmin introducing Tennis as a sport option, I tracked activity while playing tennis in the Cardio mode. An hour of singles generated correct optical HRM readings and results in circa 600 calories expended. An hour of singles in Tennis mode never shows heart rate above 110 (impossible) and results in less 300 calories expended. I have a recollection of a similar issue several years ago with either Hike or Trail Run, where the optical HRM results displayed where an order of magnitude too low. Garmin eventually corrected it. Tennis requires a similar fix.

0 Umbe over 3 years ago

same problem !! I had no idea why my heart rate during a tennis match was always under 110 bpm .... same thing with "Run activity" or "walking activities" ... only with "cardio activity" I see the true BPM .. And now I use it for my tennis activity.

But I'm not happy with Garmin, this situation is silly, heartbeat depending on the activity ??? The algorithm changes the BMP depending on the activity, even for 50-100% of the results ?? ABSURD!

0 Dessel30 over 3 years ago

Same here with forerunner 745

0 6677605 over 3 years ago in reply to JiayouJonman

I agree. I bought my watch in three months ago and the tennis setting gave realistic results. And around two months ago the readings started change. Now the readings are so bad that I played tennis for an hour with an average heart rate of 88. That is is just not possible. This requires a fix.