title: Latent growth curve modeling of adolescent physical activity: testing parallel process and mediation models.
abstract: Data from a randomized clinical trial were used to examine the extent to which a health promotion intervention affected changes in psychosocial constructs and if so whether these in turn explained changes in physical activity (PA). PA and psychosocial data on 878 adolescents (ages 11-15) recruited through primary care providers (age M = 12.7 years, SD = 1.3; 58% white non-Hispanic) were measured at baseline, six and 12 months. Parallel process latent growth curve analyses found positive relationships between the growth trajectories of behavior change strategies, self-efficacy, family support, peer support and the growth trajectory of PA. However, mediation analyses did not reveal statistically significant intervention-mediated effects.
authors.affiliation: San Diego State University, San Diego, California, USA. scroesch@sciences.sdsu.edu
authors.forename: Scott C
authors.initials: SC
authors.lastname: Roesch
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Norman
authors.forename: Marc A
authors.initials: MA
authors.lastname: Adams
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Kerr
authors.forename: James F
authors.initials: JF
authors.lastname: Sallis
authors.forename: Sherry
authors.initials: S
authors.lastname: Ryan
authors.forename: Karen J
authors.initials: KJ
authors.lastname: Calfas
authors.forename: Kevin
authors.initials: K
authors.lastname: Patrick
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008962:Models, Theoretical; D009043:Motor Activity; D017008:Negotiating; D011584:Psychology; D011795:Surveys and Questionnaires