title: When cities move children: development of a new methodology to assess context-specific physical activity behaviour among children and adolescents using accelerometers and GPS.
abstract: This study presents a novel method to assess context-specific physical activity patterns using accelerometer and GPS. The method efficiency is investigated by providing descriptive results on the use of domains and subdomains, and assessing how much of children's and adolescents' daily activity time can be classified by these domains and subdomains. Four domains and 11 subdomains were defined as important contexts for child and adolescent behaviour. During weekdays (n=367) and weekend days (n=178) the majority of children and adolescents spent time in active transport, urban green space, clubs and sports facilities. Satisfactory method efficiency was found during weekdays. Natural experiments combined with objective assessment of context-specific behaviours hold the potential to create evidence on the effects of changes to the built environment on behaviour.
authors.affiliation: Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark; Centre for Intervention Research in Health Promotion and Disease Prevention, National Institute of Public Health, University of Southern Denmark, Øster Farimagsgade 5a, 1353 Copenhagen K, Denmark. Electronic address: chkl@ucc.dk.
authors.forename: Charlotte
authors.initials: C
authors.lastname: Demant Klinker
authors.affiliation: Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark; Centre for Intervention Research in Health Promotion and Disease Prevention, National Institute of Public Health, University of Southern Denmark, Øster Farimagsgade 5a, 1353 Copenhagen K, Denmark.
authors.forename: Jasper
authors.initials: J
authors.lastname: Schipperijn
authors.affiliation: Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark; Centre for Intervention Research in Health Promotion and Disease Prevention, National Institute of Public Health, University of Southern Denmark, Øster Farimagsgade 5a, 1353 Copenhagen K, Denmark.
authors.forename: Mette
authors.initials: M
authors.lastname: Toftager
authors.affiliation: Department of Family and Preventive Medicine, University of California San Diego, San Diego, CA, USA.
authors.forename: Jacqueline
authors.initials: J
authors.lastname: Kerr
authors.affiliation: Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Campusvej 55, 5230 Odense M, Denmark; Centre for Intervention Research in Health Promotion and Disease Prevention, National Institute of Public Health, University of Southern Denmark, Øster Farimagsgade 5a, 1353 Copenhagen K, Denmark.
authors.forename: Jens
authors.initials: J
authors.lastname: Troelsen
mesh_terms: D061725:Accelerometry; D000293:Adolescent; D002648:Child; D002947:Cities; D003718:Denmark; D004777:Environment; D015444:Exercise; D005260:Female; D040362:Geographic Information Systems; D006801:Humans; D008297:Male; D011795:Surveys and Questionnaires
keywords: Accelerometer; Built environment; Children; Global positioning systems (GPS); Physical activity