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unreliable hart rate in forerunner 945

I'm using the 945 for few month and had no issues with it.

In my last runs i'm experiencing a very disturbing issue: The Hart rate is irregular and far form my real hart rate (i know because I count the bits for few seconds)

Thanks

0 ss29640 over 4 years ago

Are you using the watch's optical sensor? Check the wrist band fit. That's the biggest issue with optical sensors. Another option might be to turn the watch off and on.

0 esuss60 over 4 years ago in reply to ss29640

That, Yes I am using the optical sensor, and I did a rest and off/on, but no change

0 ss29640 over 4 years ago in reply to esuss60

When are you experiencing the issue? During a run? Sitting at home?

0 chapman34 over 4 years ago

It has been unuseable during activities for me, I had alerts for above and below Z2 today and they both kept going off... I got super sick of it and grabbed the HRM Tri and HR was rock solid.

Band was snug, I even wiped off the sensor before getting the strap.

0 MarinusvD over 4 years ago

During rest is beter to use it. But never use the 945 optical during sports. it is far from reliable then.

Use a heartrate strap !

besides u miss beautiful data on the watch in which it is a to expensive watch than

0 ss29640 over 4 years ago in reply to chapman34

I've seen that issue on my 735XT. The issue was the optical sensor lens having a hairline crack in it. I've found that my hydration levels made a difference too.