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Wrist HR too low (21.20)

I had Garmin 245 and wrist HR was perfect!

Now I have purchased a new 955 and HR is very low. It does not increase o increases very low in hard demanding intervals.

Do I have to return the watch?

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0 4977680 10 months ago

same to me since 21.18 I get very low HR. Never goes up neither on uphills or speed sessions. Giving false Vo2Max and training effect