HR dropping shortly

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

Is the battery old?

Thanks. Ever tried to get a doctors opinion?

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

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.

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.

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.

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.

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