title: Personal, behavioral, and socio-environmental correlates of physical activity among adolescent girls: cross-sectional and longitudinal associations.
abstract: BACKGROUND
  Physical activity (PA) declines sharply and rapidly during adolescence, especially among girls, posing a risk for inactivity and obesity in adulthood. This study identified personal, behavioral, and socioenvironmental correlates of concurrent and 6-month longitudinal PA among adolescent girls.
  
  
  METHODS
  Data were gathered from 356 adolescent girls (mean age 15.8 ± 1.2 years; > 75% racial/ethnic minorities) in the Minneapolis/St. Paul area in 2007-2009. Linear regression analyses controlling for age, race/ethnicity, and school were conducted predicting baseline and follow-up levels of total PA and moderate-to-vigorous PA (MVPA) assessed via 3-Day Physical Activity Recall. Models were fit for each correlate individually and for all correlates together, mutually adjusted.
  
  
  RESULTS
  For concurrent PA, significant positive predictors when adjusting for the influence of all other variables included self-efficacy, support from friends and teachers, and friends' PA. Total screen time and distance from school to PA resources related inversely to concurrent PA. In mutually-adjusted models, 6-month PA was positively related to self-worth, family support, and parent PA and inversely related to total screen time.
  
  
  CONCLUSIONS
  PA interventions with adolescent girls might be enhanced by involving adolescents' social networks and also by helping adolescents feel better about their self-worth and athletic abilities.
authors.affiliation: was with the Division of Epidemiology and Community Health, University of Minnesota, Minneapolis, MN, and is currently with the Dept. of Psychology and Colorado School of Public Health, Colorado State University, Fort Collins, CO.
authors.forename: Dan J
authors.initials: DJ
authors.lastname: Graham
authors.forename: Katherine W
authors.initials: KW
authors.lastname: Bauer
authors.forename: Sarah
authors.initials: S
authors.lastname: Friend
authors.forename: Daheia J
authors.initials: DJ
authors.lastname: Barr-Anderson
authors.forename: Dianne
authors.initials: D
authors.lastname: Nuemark-Sztainer
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior / Q000208:ethnology / Q000523:psychology*; D003430:Cross-Sectional Studies; D004779:Environment Design; D015444:Exercise / Q000502:physiology / Q000523:psychology*; D005260:Female; D005500:Follow-Up Studies; D007722:Health Knowledge, Attitudes, Practice; D006293:Health Promotion / Q000379:methods; D006801:Humans; D016014:Linear Models; D008137:Longitudinal Studies; D008910:Minnesota; D009765:Obesity / Q000453:epidemiology / Q000517:prevention & control; D010809:Physical Fitness / Q000502:physiology / Q000523:psychology*; D011594:Psychometrics; D020377:Self Efficacy; D012931:Social Environment; D012944:Social Support; D012959:Socioeconomic Factors; D013997:Time Factors; D055815:Young Adult