Physical activity levels among children attending after-school programs

Trost, Stewart G., Rosenkranz, Richard R., & Dzewaltowski, David (2008) Physical activity levels among children attending after-school programs. Medicine and Science in Sports and Exercise, 40(4), pp. 622-629.

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To describe the physical activity (PA) levels of children attending after-school programs, 2) examine PA levels in specific after-school sessions and activity contexts, and 3) evaluate after-school PA differences in groups defined by sex and weight status.


One hundred forty-seven students in grades 3-6 (mean age: 10.1 +/- 0.7, 54.4% male, 16.5% overweight (OW), 22.8% at-risk for OW) from seven after-school programs in the midwestern United States wore Actigraph GT1M accelerometers for the duration of their attendance to the program. PA was objectively assessed on six occasions during an academic year (three fall and three spring). Stored activity counts were uploaded to a customized data-reduction program to determine minutes of sedentary (SED), light (LPA), moderate (MPA), vigorous (VPA), and moderate-to-vigorous (MVPA) physical activity. Time spent in each intensity category was calculated for the duration of program attendance, as well as specific after-school sessions (e.g., free play, snack time).


On average, participants exhibited 42.6 min of SED, 40.8 min of LPA, 13.4 min of MPA, and 5.3 min of VPA. The average accumulation of MVPA was 20.3 min. Boys exhibited higher levels of MPA, VPA, and MVPA, and lower levels of SED and LPA, than girls. OW and at-risk-for-OW students exhibited significantly less VPA than nonoverweight students, but similar levels of LPA, MPA, and MVPA. MVPA levels were significantly higher during free-play activity sessions than during organized or structured activity sessions.


After-school programs seem to be an important contributor to the PA of attending children. Nevertheless, ample room for improvement exists by making better use of existing time devoted to physical activity.

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100 citations in Web of Science®

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ID Code: 71970
Item Type: Journal Article
Refereed: Yes
Additional Information: ISI Document Delivery No.: 278BU
Times Cited: 60
Cited Reference Count: 40
Trost, Stewart G. Rosenkranz, Richard R. Dzewaltowski, David
Lippincott williams & wilkins
Philadelphia; <Go to ISI>://WOS:000254259300006>
Keywords: youth, motion sensors, accelerometer, exercise, out-of-school time, gender-differences, youth, obesity, childhood, interventions, adolescents, prevalence, nutrition, education, girls
DOI: 10.1249/MSS.0b013e318161eaa5
ISSN: 0195-9131
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Deposited On: 22 May 2014 03:05
Last Modified: 06 Jun 2014 04:04

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