title: Computer-tailored physical activity behavior change interventions targeting adults: a systematic review.
abstract: BACKGROUND
  Increasing physical activity is important in the promotion of better health. Computer-tailored behavior change programs have shown promise in changing lifestyle risk factors.
  
  
  OBJECTIVE
  To provide a narrative systematic review describing the range of evidence on 'second' and 'third' generation computer-tailored primary prevention interventions for physical activity, to determine their effectiveness and key characteristics of success. Unlike previous reviews, this review used specific criteria to measure the external validity of studies, was exclusive to primary prevention interventions in which tailoring was generated through an expert system, and excluded first generation computer-tailored interventions.
  
  
  METHODS
  Computer-tailored intervention studies published from January 1996-2008 were identified through a search of five databases: Medline; Embase; PsycINFO; CINAHL; and All EBM Reviews and by examining reference lists of relevant articles.
  
  
  RESULTS
  Seventeen articles were included, describing the evaluation of 16 interventions, ten of which found significant positive effects of the computer-tailored interventions on physical activity or weight reduction outcomes.
  
  
  CONCLUSIONS
  The evidence of effectiveness for computer-tailored physical activity interventions is inconclusive. They have potential to reach large groups of people however there is uncertainty whether reported effects are generalizable and sustained.
authors.affiliation: Centre for Health Advancement, New South Wales Department of Health, Locked Mail Bag 961, North Sydney NSW 2059, Australia. neville_leonie@bigpond.com.
authors.forename: Leonie Michelle
authors.initials: LM
authors.lastname: Neville
authors.forename: Blythe
authors.initials: B
authors.lastname: O'Hara
authors.forename: Andrew
authors.initials: A
authors.lastname: Milat