title: Comparing psychosocial predictors of physical activity adoption and maintenance.
abstract: BACKGROUND
  Most health behavior models do not distinguish between determinants of behavior adoption and maintenance.
  
  
  OBJECTIVE
  This study compared psychosocial predictors of physical activity (PA) adoption and predictors of PA maintenance among 205 initially sedentary adults enrolled in a home-based PA promotion trial.
  
  
  METHODS
  Psychosocial variables were measured at 6 months (at which point 107 participants remained inactive and 98 participants adopted regular PA) and used to predict 12-month PA status (an indicator of PA adoption among those inactive at 6 months and an indicator of PA maintenance among those active at 6 months).
  
  
  RESULTS
  Six-month PA status moderated the relationships between 6-month measures of home access to PA equipment (p = .049), self-efficacy (p = .086), and perceived satisfaction (p = .062) and 12-month PA status. Simple effects analyses revealed that home access to PA equipment was predictive of PA adoption (OR = 1.73; 95% CI: 1.05, 2.85), but not PA maintenance (OR = 0.88; 95% CI: 0.58, 1.35), whereas self-efficacy and perceived satisfaction were predictive of PA maintenance (OR = 2.65; 95% CI: 1.55, 4.52; OR = 1.95; 95% CI: 0.93, 4.06), but not PA adoption (OR = 1.50; 95% CI: 0.87, 2.57; OR = 0.82, CI: 0.44, 1.52).
  
  
  CONCLUSIONS
  Results suggest that these psychosocial variables may operate differently in predicting PA adoption versus maintenance.
authors.affiliation: Alpert Medical School of Brown University and The Miriam Hospital, Centers for Behavioral and Preventive Medicine, Coro Bldg., Suite 500, One Hoppin Street, Providence, RI 02903, USA. dwilliams2@lifespan.org
authors.forename: David M
authors.initials: DM
authors.lastname: Williams
authors.forename: Beth A
authors.initials: BA
authors.lastname: Lewis
authors.forename: Shira
authors.initials: S
authors.lastname: Dunsiger
authors.forename: Jessica A
authors.initials: JA
authors.lastname: Whiteley
authors.forename: George D
authors.initials: GD
authors.lastname: Papandonatos
authors.forename: Melissa A
authors.initials: MA
authors.lastname: Napolitano
authors.forename: Beth C
authors.initials: BC
authors.lastname: Bock
authors.forename: Joseph T
authors.initials: JT
authors.lastname: Ciccolo
authors.forename: Bess H
authors.initials: BH
authors.lastname: Marcus
mesh_terms: D000328:Adult; D001521:Behavior Therapy / Q000379:methods; D015444:Exercise / Q000523:psychology*; D005260:Female; D015438:Health Behavior; D006801:Humans; D016015:Logistic Models; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D010349:Patient Compliance / Q000523:psychology*; D010809:Physical Fitness / Q000523:psychology*; D012649:Self Concept; D020377:Self Efficacy
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