title: Factors predicting behavioral response to a physical activity intervention among adolescent females.
abstract: OBJECTIVE
  To determine whether individual factors influenced rates of physical activity change in response to a school-based intervention.
  
  
  METHODS
  Sedentary adolescent females (N = 63) participated in a 9-month physical activity program. Weekly levels of leisure-time physical activity were reported using an interactive website.
  
  
  RESULTS
  Change in vigorous activity was more positive among participants who had higher fitness and lower friend support at baseline. Change in moderate activity was more positive among participants who had lower fitness and external barriers, and higher internal barriers at baseline.
  
  
  CONCLUSIONS
  Adolescent females responded differentially to a physical activity intervention depending on individual characteristics.
authors.affiliation: Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Alhambra, CA91803, USA. dunton@usc.edu
authors.forename: Genevieve Fridlund
authors.initials: GF
authors.lastname: Dunton
authors.forename: Margaret
authors.initials: M
authors.lastname: Schneider
authors.forename: Dan M
authors.initials: DM
authors.lastname: Cooper
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior / Q000523:psychology*; D005260:Female; D015438:Health Behavior; D006266:Health Education / Q000379:methods; D006293:Health Promotion / Q000379:methods*; D006801:Humans; D020407:Internet; D007899:Leisure Activities / Q000523:psychology*; D009043:Motor Activity / Q000502:physiology*; D010806:Physical Education and Training / Q000379:methods; D010809:Physical Fitness; D012572:School Health Services; D012944:Social Support