title: The Feasibility of Reducing and Measuring Sedentary Time among Overweight, Non-Exercising Office Workers.
abstract: This study examined the feasibility of reducing free-living sedentary time (ST) and the convergent validity of various tools to measure ST. Twenty overweight/obese participants wore the activPAL (AP) (criterion measure) and ActiGraph (AG; 100 and 150 count/minute cut-points) for a 7-day baseline period. Next, they received a simple intervention targeting free-living ST reductions (7-day intervention period). ST was measured using two questionnaires following each period. ST significantly decreased from 67% of wear time (baseline period) to 62.7% of wear time (intervention period) according to AP (n = 14, P < 0.01). No other measurement tool detected a reduction in ST. The AG measures were more accurate (lower bias) and more precise (smaller confidence intervals) than the questionnaires. Participants reduced ST by ~5%, which is equivalent to a 48_min reduction over a 16-hour waking day. These data describe ST measurement properties from wearable monitors and self-report tools to inform sample-size estimates for future ST interventions.
authors.affiliation: Department of Kinesiology, University of Massachusetts, Amherst, MA 01003, USA.
authors.forename: Sarah
authors.initials: S
authors.lastname: Kozey-Keadle
authors.forename: Amanda
authors.initials: A
authors.lastname: Libertine
authors.forename: John
authors.initials: J
authors.lastname: Staudenmayer
authors.forename: Patty
authors.initials: P
authors.lastname: Freedson