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OftenBen · 2989 days ago · link · · parent · post: Activity trackers are ineffective at sustaining weight loss
There is a Fitbit tracked activity component in two of the research studies I work on. We were worried about this confounding our results but it seems like people only really change their behavior for a little over a month after they start wearing a Fitbit. After that counts and heart rates tend to normalize and approach their 'real' activity level.