title: Motivational interviewing and self-determination theory in a web-based computer tailored physical activity intervention: A randomized controlled trial.
abstract: OBJECTIVE
  This study explores whether a web-based physical activity (PA) intervention grounded in self-determination theory (SDT) and motivational interviewing (MI) is more effective and better appreciated than a traditional web-based PA intervention.
  
  
  METHODS
  A randomized controlled trial was conducted, comparing (1) I Move; a web-based PA intervention based on SDT and MI, (2) Active Plus; a traditional web-based PA intervention and (3) a waiting list control condition.
  
  
  METHODS
  Weekly minutes of moderate to vigorous PA and weekly days with ≥30 min PA were measured through self-report at baseline and at 3 and 6 months from baseline.
  
  
  RESULTS
  I Move achieved a small, but significant increase in weekly minutes of moderate to vigorous PA, while Active Plus did not have a significant impact on this outcome. Both interventions were effective in increasing weekly days with ≥30 min PA, whereas Active Plus yielded a greater effect on this outcome.
  
  
  CONCLUSIONS
  Overall, the web-based PA intervention grounded in SDT and MI did not outperform the traditional web-based PA intervention. Further research should reveal whether this type of intervention is profitable for long-term maintenance of PA levels.
authors: a Faculty of Psychology and Educational Sciences , Open University of the Netherlands , Heerlen , The Netherlands.
authors: Stijn A H
authors: SA
authors: Friederichs
authors: b Department of Health Promotion , Maastricht University , Maastricht , The Netherlands.
authors: Anke
authors: A
authors: Oenema
authors: a Faculty of Psychology and Educational Sciences , Open University of the Netherlands , Heerlen , The Netherlands.
authors: Catherine
authors: C
authors: Bolman
authors: a Faculty of Psychology and Educational Sciences , Open University of the Netherlands , Heerlen , The Netherlands.
authors: Lilian
authors: L
authors: Lechner
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015444:Exercise; D005260:Female; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D020407:Internet; D008297:Male; D008875:Middle Aged; D062405:Motivational Interviewing; D026684:Personal Autonomy; D011582:Psychological Theory; D055815:Young Adult
keywords: motivational interviewing self-determination theory; physical activity