Changes in sedentary behavior among adolescent girls: a 2.5-Year prospective cohort study

Hardy, Louise, Bass, Shona and Booth, Michael 2007, Changes in sedentary behavior among adolescent girls: a 2.5-Year prospective cohort study, Journal of adolescent health, vol. 40, no. 2, pp. 158-165.


Title Changes in sedentary behavior among adolescent girls: a 2.5-Year prospective cohort study
Author(s) Hardy, Louise
Bass, Shona
Booth, Michael
Journal name Journal of adolescent health
Volume number 40
Issue number 2
Start page 158
End page 165
Publisher Elsevier Science Pub. Co.
Place of publication New York, N.Y.
Publication date 2007-02
ISSN 1054-139x
1879-1972
Keyword(s) adolescents
longitudinal
mixed model
small screen recreation
Summary Purpose: To describe longitudinal changes in leisure-time sedentary behavior among girls, during early to mid-adolescence. Methods: A 2.5-year prospective cohort study, comprising 5 data collections, 6 months apart, between 2000 and 2002. Girls aged 12–15 years (n = 200) from 8 high schools located in Sydney, Australia, self-reported the usual time spent each week in a comprehensive range of sedentary behaviors.  Results: Retention rate for the study was 82%. Girls aged 12.8 years spent approximately 45% of their discretionary time in sedentary behavior, which increased to 63% at age 14.9 years. Watching TV, videos, and playing video games (small screen recreation; SSR) was the most popular sedentary pastime, accounting for 33% of time spent in sedentariness, followed by homework and reading (25%). Sedentary behavior increased 1.4 and 3.3 hours on week and weekend days, respectively. On weekdays, increased time was spent on hobbies (27 min/day) and on weekend days, increased time was spent sitting around talking with friends (60 min/day), computer use (37 min/day), and television viewing (34 min/day). Conclusions: Among girls, the transition between early and mid-adolescence was accompanied by a significant increase in leisure-time sedentary behavior. Interventions to reduce sedentariness among adolescent girls are best to focus on weekend behaviors. Studies seeking to examine the association between inactivity and the development of chronic health problems need to examine a diverse range of activities that comprehensively measure sedentariness. This information will provide a better understanding of inactivity patterns among adolescent girls.
Language eng
Field of Research 170114 Sport and Exercise Psychology
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007, Society for Adolescent Medicine
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007097

Document type: Journal Article
Collection: School of Exercise and Nutrition Sciences
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