• Sander M Slootmaker, Mai J M Chinapaw, Jacob C Seidell, Willem van Mechelen, and Albertine J Schuit.
• EMGO Institute for Health and Care Research, Department of Public and Occupational Health, Body@Work Research Center Physical Activity, Work and Health, TNO-VU University Medical Center, 1081 BT Amsterdam, The Netherlands.
• Prev Med. 2010 Jul 1; 51 (1): 31-6.

ObjectiveTo evaluate the feasibility and effectiveness of a 3-month minimal physical activity (PA) intervention in adolescents.MethodsA randomised controlled trial, including five secondary schools (n=87). In the 3-month intervention (Amsterdam, The Netherlands, 2005) adolescents were provided with a PAM accelerometer, coupled to a web-based tailored PA advice (PAM COACH). Measurements (i.e., PA, determinants of PA, aerobic fitness and anthropometrics) took place at baseline and at 3- and 8-month follow-up.ResultsSixty-five percent of the participants in the intervention group reported to have worn the PAM frequently and 56% of the PAM users uploaded their PAM scores to the PAM COACH at least once. We found significant differences between groups in favour of the intervention group in moderate intensity PA (MPA) for girls after 3 months (411 min/week; 95% CI: 1; 824; P=0.04) and in sedentary time for boys after 8 months (-1801 min/week; 95% CI: -3545; -57; P=0.04).ConclusionsAlthough the process evaluation suggests that a substantial proportion of the participants did not regularly wear the PAM and did not upload information to the PAM COACH website, our findings suggest promising intervention effects on MPA among girls and sedentary time among boys.Copyright 2010 Elsevier B.V. All rights reserved.

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