Abstract:
BACKGROUND:Despite the benefits of physical activity, many Canadian adolescents are inactive and rates of inactivity increase with age. Few studies describe the pattern of change in physical activity as a function of age during adolescence. METHODS:Data were drawn from the Nicotine Dependence in Teens Study. The analytic sample included 1206 adolescents who completed a 7-day physical activity recall up to 4 times per year over 5 years. Individual growth models, analyzed using multilevel models for change, were developed separately by sex controlling for season. RESULTS:Physical activity levels through adolescence were best described by a cubic function. Levels increased from age 12 to a peak at approximately age 13.5, decreased to age 16.5, and increased again to age 17. Activity participation was highest in the spring and lowest during fall and winter. Substantial within- and between-subject heterogeneity in the trajectories was evident. CONCLUSION:Adolescent physical activity follows a complex, curvilinear pattern in both males and females, with considerable variation within- and between-persons.
journal_name
J Phys Act Healthjournal_title
Journal of physical activity & healthauthors
Langlois KA,Birkett N,Garner R,O'Loughlin Jdoi
10.1123/jpah.9.8.1146subject
Has Abstractpub_date
2012-11-01 00:00:00pages
1146-54issue
8eissn
1543-3080issn
1543-5474pii
2011-0022journal_volume
9pub_type
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