. Author manuscript; available in PMC: 2016 Oct 1.

Published in final edited form as: Am J Prev Med. 2015 Oct;49(4):653–659. doi: 10.1016/j.amepre.2015.06.020

Table 2.

Operational Definitions of Physical Activity and Sedentary Behavior Variables Derived from Accelerometry

Variable	Definition
Total activity	Daily vector magnitude sum from 3 axes
Total physical activity (min/day)	Sum of all wear min w/ Actigraph count values >100
Sedentary behavior (min/day)	Accumulated daily min w/ Actigraph count value ≤100
Light intensity physical activity (min/day)	Accumulated daily min w/ Actigraph count range ≥101 to age-adjusted value (1,400-2,780)
Moderate-to-vigorous activity (MVPA) (min/day)	Accumulated daily min w/ Actigraph count values ≥age-adjusted cut-off (1,400-2,780)
Vigorous activity (min/day)	Accumulated daily min w/ Actigraph count values ≥age-adjusted cut-off (3,758-6,007)
MET-weighted MVPA (MET-min/day)^a	Daily MET-weighted minutes of MVPA

1 MET=3.5 mL O₂ kg^–1 min^–1, which is the rate of energy expenditure at rest. MET-minutes (MET-min)=minutes spent in activity × MET level of the activity.