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The Feasibility of Reducing and Measuring Sedentary Time among Overweight, Non-Exercising Office Workers

2011; Hindawi Publishing Corporation; Volume: 2012; Linguagem: Inglês

10.1155/2012/282303

2090-0716

Sarah Kozey Keadle, Amanda Libertine, John Staudenmayer, Patty S. Freedson,

Eating Disorders and Behaviors

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.