Effect of wrist-worn activity monitor feedback on physical activity behavior: A randomized controlled trial in Finnish young men

Abstract

AbstractThe purpose of this study is to evaluate whether the use of an activity monitor providing feedback has an effect on physical activity (PA) in young men. A population-based sample of 276 conscription-aged (mean=17.9, SD=0.7years) men participated in a 3-month randomized controlled trial in Oulu in 2012. Participants were randomized to an intervention group (INT, N=137) and a control group (CON, N=139). INT received a wrist-worn monitor (Polar Active) showing daily activity, and CON received identical monitors without feedback. Main outcome was the change from baseline in objectively measured weekly time spent in moderate-to-vigorous PA (MVPA) and sedentary activity (SED), as assessed by generalized estimation equations (GEE). Other lifestyle factors were assessed by a questionnaire at baseline and at 3months. Weekly physical activity data (≥4days with ≥8h each) were obtained from 72 (53%) and 90 (65%) men in the INT and CON, respectively. Based on GEE, time spent in MVPA increased (p=0.012) and SED decreased (p=0.032) in the INT compared with the CON. During the first 7weeks, the INT spent on average 1h less sedentary than the CON (t-test, p<0.05). During the first week, the INT showed 12minutes more MVPA compared to the CON (t-test, p=0.034). Based on questionnaire data, the proportion of the most sedentary men decreased in the INT (Wilcoxon test, 28% vs. 10%, p=0.029), with no change in the CON (20% vs. 19%, p=0.546). To conclude, a wrist-worn activity monitor providing feedback had a short-term positive effect on PA and SED in young men.Trial registrationThis is a pilot study for a larger randomized controlled trial registered to the clinical trials register NCT01376986