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HR dropping shortly

When running (HRM Run) the measured HR has short but sharp drops in it.

The picture spans approximately 90 mins

Any ideas as to why?

No ideas but I have been seeing these for many years on different straps and OHR on different watches. Since I cannot pin it down to a strap or a watch I’ve come to the conclusion it’s something to do with my physiology. This is from the other day - two on WHR, one on HRM-Pro

0 badbri over 3 years ago

Is the battery old?

0 6957586 over 3 years ago in reply to Dr Phil

Thanks. Ever tried to get a doctors opinion?

0 6957586 over 3 years ago in reply to badbri

Had that idea too. Changed the battery, but the drops keep appearing.

0 HUMODDA over 3 years ago

I have exactly the same issue with the FR945 and the HRM-Tri. Looks the same as yours. I have solved it by using my FR935 for running with this strap. There the chart is smooth without any drop-outs. It's definetely something with the watch FW (e.g. Sensor Hub).

Should you also own a FR935 please try it with that one and compare. It would be interesting if you could confirm my observation.

0 angainor over 3 years ago

I have similar observations and it's funny - I managed to correlate this with burping. Every time I burp, my pulse drops quite a lot. And when I drink during a hot weather run, this happens quite often.

0 Dr Phil over 3 years ago in reply to 6957586

No I haven't. Thought I'd wait until I had a cardiac arrest lol!

Seriously though, I've done some exercise use with 12-channel ECGs for research and no anomalies have been seen. That's not to say the same applies to you. I did use to think it was strap only but when OHR became a thing I saw the same thing, so clearly not (in my case anyway) strap related.

0 Dr Phil over 3 years ago in reply to HUMODDA

HUMODDA said:
Should you also own a FR935 please try it with that one and compare. It would be interesting if you could confirm my observation.

As noted I've seen this with straps and OHR (since 935). Straps are HRM-RUN (sensor module), HRM-Pro, and HRM-Dual used with 910XT, 920XT, 935, 945, F6 and Marq Athlete.

0 dizle over 3 years ago

My hr looks like that, because I pause the watch at stop lights and my hr drops.

0 Dr Phil over 3 years ago in reply to dizle

I don’t. It’s nothing to do with stopping the watch or pausing during an activity.