@article{ref1,
title="Variability of school children's activity comes from recess and before-school",
journal="Pediatrics international",
year="2018",
author="Suzuki, Iku and Okuda, Masayuki and Tanaka, Maki and Inoue, Shigeru and Tanaka, Shigeho and Tanaka, Chiaki",
volume="60",
number="8",
pages="727-734",
abstract="BACKGROUND: An accurate description of physical activity (PA) at school is required for appropriate health interventions. We examined PA patterns of children, and identified time periods that influenced them. <br><br>METHODS: Forty students in 5 Japanese primary schools were asked to wear triaxial accelerometers for at least7 days. We obtained coefficients of variance (CV) at 15 min intervals, and conducted factor analysis of the school periods. A questionnaire was used to investigate where students spent time before school, and during recesses. <br><br>RESULTS: The amount of PA, and its CV were higher around 8 AM (before-school period), 10 AM (morning recess), 1 PM (lunch recess), and 4 PM (commuting back from the school). Moderate-to-vigorous PA (MVPA; ≥ 3.0 METs) was highest during lunch recess and the after-school period (12.9 ± 7.4 min and 12.6 ± 6.2 min, respectively). The percentage of MVPA time was high (>15%) in the before-school period and morning and lunch recesses, but low (10%) in the after-school period. Factor analysis revealed differences in PA patterns for school period and those for after-school period. The students who spent their time in the playground logged more MVPA time and less sedentary time (≤1.5 METs) than those who did not spend their time in the playground. <br><br>CONCLUSION: The activities before school, and in the morning and lunch recesses influenced daily PA, and were different from after-school PA. Close attention to these periods may help in defining PA properties during free time at school for PA interventions in children. This article is protected by copyright. All rights reserved.<br><br>This article is protected by copyright. All rights reserved.<p /> <p>Language: en</p>",
language="en",
issn="1328-8067",
doi="10.1111/ped.13616",
url="http://dx.doi.org/10.1111/ped.13616"
}