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HR affected by lying on arm

Has this happened to anyone else? Lying down, arm under my head. Feeling relaxed. Charge 6 buzzes that my HR is 150 and it's a problem because I'm inactive. Sit up, panicking. Check my pulse manually, definitely not 150. Switch Fitbit to other arm. HR 90.

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Welcome to the forums @mhataro2.

Thank you for providing this information regarding your Charge 6. 

I have no doubt that wearing the device on your arm below your head gives you an inaccurate indicator of your heart rate.

Please, take a look at the following points listed in the article: What factors can affect my heart-rate reading on my Fitbit device?

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