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Cardiac score changed overnight

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One day my cardiac score was a range of 43-47, excellent for my age apparently, to a single score of 35.  While the app still says that’s excellent for my age, what happened?  Did Fitbit change something in the algorithm?  What else would make it change so dramatically overnight? 

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I should clarify that I’m referring to my “Cardio Fitness” score in my question. Thanks for any help with this. 

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