title: Motivational Outcomes and Predictors of Moderate-to-Vigorous Physical Activity and Sedentary Time for Adolescents in the Sigue La Huella Intervention.
abstract: OBJECTIVE
  The purpose of this study was to investigate the effects of the multicomponent Sigue la Huella intervention on selected motivational outcomes and whether any of these outcomes, in addition to relevant socio-demographic, biological, and behavioral factors, served as predictors of moderate-to-vigorous physical activity and sedentary time among participants through the intervention.
  
  
  METHODS
  This quasi-experimental, cohort study took place in four secondary schools in Huesca (Spain) during three academic years (students aged 12-15 years). Two schools were assigned to the experimental condition (n = 368) and two schools to the control condition (n = 314). Outcome variables were assessed objectively.
  
  
  RESULTS
  A total of 553 participants met study inclusion criteria. Compared to the control group, participants in the experimental group reported greater enjoyment of physical activity, intrinsic and extrinsic motivation in physical education, perceived autonomy in physical education, perceived competence in physical education, and perceived importance of physical education over time. Participants in this group reported also lower amotivation in physical education over time. In subsequent analyses, gender, organized physical activity out of school, sedentary time, and perceived importance of physical education predicted moderate-to-vigorous physical activity. Type of school (public vs. private), moderate-to-vigorous physical activity, and perceived autonomy in physical education emerged as predictors of sedentary time.
  
  
  CONCLUSIONS
  Sigue la Huella had a positive effect on motivational outcomes relevant to moderate-to-vigorous physical activity, sedentary time, and, particularly, student engagement in physical education. The analyses identified shared and unique determinants of moderate-to-vigorous physical activity and sedentary time, suggesting that specific intervention strategies may be required to address each outcome.
authors.affiliation: Facultad de Ciencias de la Salud, Universidad San Jorge, Villanueva de Gállego, C.P.50.830, Spain. bmurillo@usj.es.
authors.forename: Berta
authors.initials: B
authors.lastname: Murillo Pardo
authors.affiliation: School of Science and Health, University of Western Sydney, Penrith, NSW, 2751, Australia. enrique.garcia@uws.edu.au.
authors.forename: Enrique
authors.initials: E
authors.lastname: García Bengoechea
authors.affiliation: Departamento de Expresión Musical, Plástica y Corporal, Universidad de Zaragoza, Huesca, C.P. 22002, Spain. jajulian@unizar.es.
authors.forename: José Antonio
authors.initials: JA
authors.lastname: Julián Clemente
authors.affiliation: Departamento de Expresión Musical, Plástica y Corporal, Universidad de Zaragoza, Huesca, C.P. 22002, Spain. generelo@unizar.es.
authors.forename: Eduardo
authors.initials: E
authors.lastname: Generelo Lanaspa
mesh_terms: D000293:Adolescent; D002648:Child; D015331:Cohort Studies; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D009042:Motivation; D009043:Motor Activity; D010806:Physical Education and Training; D012574:Schools; D013030:Spain; D013334:Students / Q000523:psychology
keywords: Adolescence; Motivation; Physical education; School; Self-determination theory; Social ecology