HR issue founded on epix2

100 bpm seems really low for jump rope, it's quite an intense workout. If you're doing jump rope for 5+ minutes I would expect your heart rate to be between 150-190bpm, if you're an elite athlete then maybe less but 100 seems way too low. I could be wrong of course as I'm no expert but I'd believe the Epix personally.

Do you have access to a chest heart rate strap? If not, maybe try jump rope then after stopping immediately take your pulse manually with your fingers against your neck and count for 15 seconds then times that by 4 to get the beats per minute. See which watch value it's generally closer too.

thanks for your guys mentioned the wearing,im sure i wear it properly.im a moderate runner for 1400 miles a year with sub 3 hour marathon personal record.i think i exactly know my body when it hit 180HR or above,when i hit that i just can't talk.

30 minutes rope jump hit the red zone that's really can't happen for me.

As a follow-up to my earlier post, I think your situation demonstrates the challenge in accurately measuring jump rope.  I have not gotten around to selling my 6X Pro Solar and it has such amazing battery life that last night before jumping rope I put it on my left wrist with my Epix 2 on my right wrist.  After a 13-minute workout, they differed in average bpm by 15 bpm:

The Epix 2 recorded an average bpm of 123 bpm and max of 138 bpm.  The Fenix 6X Pro Solar recorded an average of 138 bpm and a max of 179 bpm.  I am pretty confident neither is exactly "right."  What i think this demonstrates is the challenge of recording bpm accurately with a wrist watch.  (not in the same way, but the similar result that the watch does not accurately record hr during a swim).

On my 6-mile trail run earlier today, the Epix 2 had average hr of 131 bpm and max of 155 bpm.  The Apple Watch 7 was average hr of 130 bpm and max of 152 bpm.  

In one week of use, I think the Epix 2 performs comparably to other Garmin devices I have owned.  I just think jump rope is not well measured.

Sean

wait for garmin fix the bug

It’s not a bug. It’s a generic limitation of wrist heart rate. 

Jump rope at a moderate pace will max out your heart rate.  You are saying 30 minutes.  I would go by readings on the AW and the Epix.  The AW7 has the best WRH money can buy, but the Epix I think may be right up there with it.   The Fenix 6, a lot of people had issues.

I would love for you to test this with a smaller watch like a Fenix 7s.  Something light with no jiggle.  Jump Rope involves a lot of lower arm movement, and quick ones.  A larger watch will jiggle on a small wrist like yours and you will never really get accurate HR measurements.

WHR is very accurate on the Epix and AW.