title: Accelerometers and Internet for physical activity promotion in youth? Feasibility and effectiveness of a minimal intervention [ISRCTN93896459].
abstract: OBJECTIVE
  To evaluate the feasibility and effectiveness of a 3-month minimal physical activity (PA) intervention in adolescents.
  
  
  METHODS
  A 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.
  
  
  RESULTS
  Sixty-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).
  
  
  CONCLUSIONS
  Although 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.
authors.affiliation: 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.
authors.forename: Sander M
authors.initials: SM
authors.lastname: Slootmaker
authors.forename: Mai J M
authors.initials: MJ
authors.lastname: Chinapaw
authors.forename: Jacob C
authors.initials: JC
authors.lastname: Seidell
authors.forename: Willem
authors.initials: W
authors.lastname: van Mechelen
authors.forename: Albertine J
authors.initials: AJ
authors.lastname: Schuit
mesh_terms: D000293:Adolescent; D015444:Exercise; D005080:Exercise Test; D005081:Exercise Therapy; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D020407:Internet; D008297:Male; D018670:Monitoring, Ambulatory / Q000295:instrumentation* / Q000379:methods; D010349:Patient Compliance; D010809:Physical Fitness; D040242:Risk Reduction Behavior; D057185:Sedentary Behavior; D012737:Sex Factors; D017216:Telemedicine