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Int J Behav Nutr Phys Act. 2010 Dec 31;7:92. doi: 10.1186/1479-5868-7-92.

Descriptive epidemiology of screen and non-screen sedentary time in adolescents: a cross sectional study.

Author information

  • 1Health and Use of Time (HUT) Group, Sansom Institute for Health Research, University of South Australia, GPO Box 2471, Adelaide, 5001, South Australia, Australia. carol.maher@unisa.edu.au.

Abstract

BACKGROUND:

Much attention has been paid to adolescents' screen time, however very few studies have examined non-screen sedentary time (NSST). This study aimed to (1) describe the magnitude and composition of screen sedentary time (SST) and NSST in Australian adolescents, (2) describe the socio-demographic correlates of SST and NSST, and (3) determine whether screen time is an adequate surrogate for total sedentary behaviour in this population.

METHODS:

2200 9-16 year old Australians provided detailed use of time data for four days. Non-screen sedentary time (NSST) included time spent participating in activities expected to elicit <3 METs whilst seated or lying down (other than sleeping), excluding screen-based activities (television, playing videogames or using computers). Total sedentary time was the sum of screen time and NSST.

RESULTS:

Adolescents spent a mean (SD) of 345 (105) minutes/day in NSST, which constituted 60% of total sedentary time. School activities contributed 42% of NSST, socialising 19%, self-care (mainly eating) 16%, and passive transport 15%. Screen time and NSST showed opposite patterns in relation to key socio-demographic characteristics, including sex, age, weight status, household income, parental education and day type. Because screen time was negatively correlated with NSST (r = -0.58), and exhibited a moderate correlation (r = 0.53) with total sedentary time, screen time was only a moderately effective surrogate for total sedentary time.

CONCLUSIONS:

To capture a complete picture of young people's sedentary time, studies should endeavour to measure both screen time and NSST.

PMID:
21194427
[PubMed]
PMCID:
PMC3024298
Free PMC Article
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