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Heart rate spike deep sleep 200 plus ionic

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‎01-16-2021 16:34

‎01-16-2021 16:34

After a massive MTB ride  yesterday my Fitbit recorded a spike of 208 bpm in the middle of the night. 
‘I’m guessing (hoping) this is a fault in the Fitbit ionic. How accurate are these things for heart rate anyway ? 

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‎01-16-2021 21:13

‎01-16-2021 21:13

I find mine extremely accurate, assuming the band is tight enough to keep the tracker snug to the arm.

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