title: Changes in Individual and Social Environmental Characteristics in Relation to Changes in Physical Activity: a Longitudinal Study from Primary to Secondary School.
abstract: Physical activity (PA) strongly decreases when children make the transition from primary to secondary school. The study aimed to investigate how individual and social environmental factors toward PA changed when children (11-12 years) made the transition from primary to secondary school (13-14 years) and how changes in these factors were related to changes in different PA domains.
  
  
  
  In total, 321 children (48.9 % girls) and one of their parents both filled out a questionnaire concerning individual (i.e., attitude, self-efficacy, perceived benefits, and barriers of PA) and social environmental factors related to PA (parental support, friend's co-participation, parental trust in child's ability to be physically active, and social norm) in the last grade of primary school and 2 years later. Children wore an activity monitor for 7 days and self-reported different domains of PA.
  
  
  
  Most individual and social factors became less positive toward PA after the transition to secondary school. Among girls, a more positive attitude and an increase in self-efficacy were related to an increase in average daily steps and sports during leisure, respectively. Among boys, a decrease in perceived barriers (lack of time and parental reported lack of transportation to sport activities) was related to a decrease in average daily steps. An increase in parental support and a decrease in the parental perceived barrier of not liking sports were related to an increase in sports during leisure.
  
  
  
  The prevention of adverse changes in individual and social factors toward physical activity may lead to a smaller decrease or an increase in physical activity.
authors.affiliation: Faculty of Medicine and Health Sciences, Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000, Ghent, Belgium.|Research Foundation Flanders (FWO), Egmontstraat 5, Brussels, 1000, Belgium.
authors.forename: Sara
authors.initials: S
authors.lastname: D'Haese
authors.affiliation: Faculty of Medicine and Health Sciences, Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000, Ghent, Belgium. greet.cardon@ugent.be.
authors.forename: Greet
authors.initials: G
authors.lastname: Cardon
authors.affiliation: Faculty of Medicine and Health Sciences, Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000, Ghent, Belgium.
authors.forename: Ilse
authors.initials: I
authors.lastname: De Bourdeaudhuij
authors.affiliation: Faculty of Medicine and Health Sciences, Department of Public Health, Ghent University, De Pintelaan 185, 9000, Ghent, Belgium.|Faculty of Physical Education and Physiotherapy, Department of Human Biomechanics and Biometry, Vrije Universiteit Brussel, Pleinlaan 2, 1050, Brussel, Belgium.
authors.forename: Benedicte
authors.initials: B
authors.lastname: Deforche
authors.affiliation: Faculty of Medicine and Health Sciences, Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000, Ghent, Belgium.|Flemish Institute for Health Promotion and Disease Prevention (VIGeZ), Gustave Schildknechtstraat 9, 1020, Brussels (Laken), Belgium.
authors.forename: Femke
authors.initials: F
authors.lastname: De Meester
authors.affiliation: Faculty of Medicine and Health Sciences, Department of Movement and Sports Sciences, Ghent University, Watersportlaan 2, 9000, Ghent, Belgium.|Research Foundation Flanders (FWO), Egmontstraat 5, Brussels, 1000, Belgium.
authors.forename: Delfien
authors.initials: D
authors.lastname: Van Dyck
mesh_terms: D000293:Adolescent; D002648:Child; D004777:Environment; D015444:Exercise; D005260:Female; D006801:Humans; D007899:Leisure Activities; D008137:Longitudinal Studies; D008297:Male; D010290:Parents; D010465:Perception; D012574:Schools; D020377:Self Efficacy; D013177:Sports; D011795:Surveys and Questionnaires; D014186:Transportation
keywords: Adolescent; Changes; Child; Neighborhood; Psychosocial