I suggest the activity minutes monitor algorithm be updated to reflect latest research. The Journal of the American Heart Association 2018-03-22 published an important article at https://doi.org/10.1161/JAHA.117.007678 that calls for updating the 2008 US Physical Activities Guidelines, as they found that bouts of moderate to vigorous physical activity even less than 10 minutes were associated with less all-cause mortality. Fitbit announced 2015-04-03 changing the activity tracking algorithm to correspond with guidelines calling for at least 10min MVPA bouts. Any change should be coordinated with the researchers at the All Of Us project using Fitbit trackers. The JAHA study used waist Actigraph trackers, with activity counts <760 counts/min and allowed for 1 or 2 min pause in 5 or 10min bouts. Any Fitbit change in hardware or software should be calibrated against this standard. Also: "Overall, greater total MVPA was associated with lower mortality, reaching a plateau at about 100 min/d, with no appreciable additional benefit of greater relative contributions of bouted activity. It was also evident that accumulating greater total MVPA required continuous bouts of activity."
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