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Cardio fitness score went down

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Until last week, in the Fitbit app, I use to have a Cardio Fitness Score around 54 in the range between very good and excellent. But since a couple of days this score changed a lot and now it's around 46 which is in the good level (and the range is not displayed anymore).

 

I don't get why this score changed like this in just a few days. I'm constantly training and meditate as usual. I didn't change anything of my habits. And I'm still feeling very good, fortunately 🙂 

 

Why this score changed like that? Any explanation?

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Check whether you have done an activity that could have caused the sudden change - for example a treadmill run marked just as a "run" will have this effect - as the device perceives that you have run for a time but not actually moved - it confuses it. I'm going to guess that if you had walking activities marked as runs this could cause the same effect as again, the device would think that your running speed was below that which it would expect. Certainly worth checking anyway!

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