Sedentariness, Small-Screen Recreation, and Fitness in Youth

Hardy, LL; Dobbins, TA; Denney-Wilson, EA; Okely, AD; Booth, ML

Sedentariness, Small-Screen Recreation, and Fitness in Youth

Hardy, LL Dobbins, TA Denney-Wilson, EA

Okely, AD Booth, ML

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Publication Type:: Journal Article
Citation:: American Journal of Preventive Medicine, 2009, 36 (2), pp. 120 - 125
Issue Date:: 2009-02-01

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Field	Value	Language
dc.contributor.author	Hardy, LL	en_US
dc.contributor.author	Dobbins, TA	en_US
dc.contributor.author	Denney-Wilson, EA https://orcid.org/0000-0001-9879-4969	en_US
dc.contributor.author	Okely, AD	en_US
dc.contributor.author	Booth, ML	en_US
dc.date.available	2008-09-25	en_US
dc.date.issued	2009-02-01	en_US
dc.identifier.citation	American Journal of Preventive Medicine, 2009, 36 (2), pp. 120 - 125	en_US
dc.identifier.issn	0749-3797	en_US
dc.identifier.uri	http://hdl.handle.net/10453/31168
dc.description.abstract	Background: There are concerns that sedentariness among young people has increased and that this may be detrimental to their health. The purpose of this study was to examine the association between sedentary activities, including small-screen recreation (SSR: watching TV/DVDs/videos, recreational computer use) and cardiorespiratory endurance (CRE) in children aged 11-15 years. Methods: A cross-sectional representative population survey was taken of New South Wales (Australia) school students in Grades 6, 8, and 10 (N=2750) in 2004. Sedentary activities and SSR were measured by a self-report questionnaire. CRE was determined by the 20-meter multi-stage shuttle run test. The optimal cut point for time spent on SSR was determined by receiver operating characteristic analysis. Results: Time spent in sedentary activities was inversely associated with CRE among Grade 8 students (p=0.01) and Grade 10 girls (p=0.03). CRE was lower among Grade 8 students (p<0.001) and Grade 10 girls (p<0.001) who spent ≥2 hours/day on SSR compared with students who spent <2 hours/day. The 2-hour/day cut point for SSR had high sensitivity (boys: 84%, [95% CI=79%, 87%]; girls: 79% [95% CI=74%, 84%]) and low specificity (boys: 28% [95% CI=24%, 32%]; girls: 42% [95% CI=38%, 46%]). Conclusions: Cardiorespiratory endurance did not differ consistently across quintiles of sedentariness and SSR among boys; however, among girls there was a consistent inverse association. If confirmed in prospective studies, these findings have important implications for risk of chronic disease. © 2009 American Journal of Preventive Medicine.	en_US
dc.relation.ispartof	American Journal of Preventive Medicine	en_US
dc.relation.isbasedon	10.1016/j.amepre.2008.09.034	en_US
dc.subject.classification	Public Health	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Exercise	en_US
dc.subject.mesh	ROC Curve	en_US
dc.subject.mesh	Age Factors	en_US
dc.subject.mesh	Sex Factors	en_US
dc.subject.mesh	Physical Endurance	en_US
dc.subject.mesh	Video Games	en_US
dc.subject.mesh	Physical Fitness	en_US
dc.subject.mesh	Television	en_US
dc.subject.mesh	Computers	en_US
dc.subject.mesh	Adolescent	en_US
dc.subject.mesh	Child	en_US
dc.subject.mesh	Female	en_US
dc.subject.mesh	Male	en_US
dc.subject.mesh	Overweight	en_US
dc.title	Sedentariness, Small-Screen Recreation, and Fitness in Youth	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	36	en_US
utslib.for	1106 Human Movement and Sports Sciences	en_US
utslib.for	11 Medical and Health Sciences	en_US
utslib.for	13 Education	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Health
pubs.organisational-group	/University of Technology Sydney/Strength - CHSP - Health Services and Practice
utslib.copyright.status	closed_access
pubs.issue	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	36	en_US

Abstract:

Background: There are concerns that sedentariness among young people has increased and that this may be detrimental to their health. The purpose of this study was to examine the association between sedentary activities, including small-screen recreation (SSR: watching TV/DVDs/videos, recreational computer use) and cardiorespiratory endurance (CRE) in children aged 11-15 years. Methods: A cross-sectional representative population survey was taken of New South Wales (Australia) school students in Grades 6, 8, and 10 (N=2750) in 2004. Sedentary activities and SSR were measured by a self-report questionnaire. CRE was determined by the 20-meter multi-stage shuttle run test. The optimal cut point for time spent on SSR was determined by receiver operating characteristic analysis. Results: Time spent in sedentary activities was inversely associated with CRE among Grade 8 students (p=0.01) and Grade 10 girls (p=0.03). CRE was lower among Grade 8 students (p<0.001) and Grade 10 girls (p<0.001) who spent ≥2 hours/day on SSR compared with students who spent <2 hours/day. The 2-hour/day cut point for SSR had high sensitivity (boys: 84%, [95% CI=79%, 87%]; girls: 79% [95% CI=74%, 84%]) and low specificity (boys: 28% [95% CI=24%, 32%]; girls: 42% [95% CI=38%, 46%]). Conclusions: Cardiorespiratory endurance did not differ consistently across quintiles of sedentariness and SSR among boys; however, among girls there was a consistent inverse association. If confirmed in prospective studies, these findings have important implications for risk of chronic disease. © 2009 American Journal of Preventive Medicine.

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http://hdl.handle.net/10453/31168