Changes in Weight, Sedentary Behaviour and Physical Activity during the School Year and Summer Vacation
1
Division of Integrated Sciences, J. F. Oberlin University, Tokyo 194-0294, Japan
2
Physical Activity for Health Group, School of Psychological Sciences & Health, University of Strathclyde, Glasgow G1 1QE, UK
3
Department of Child Education, Kyoto Seibo College, Kyoto 612-0878, Japan
4
Department of Nutrition and Metabolism, National Institute of Health and Nutrition, National Institutes of Biomedical Innovation, Health and Nutrition, Tokyo 162-8636, Japan
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2018, 15(5), 915; https://doi.org/10.3390/ijerph15050915
Received: 18 March 2018 / Revised: 19 April 2018 / Accepted: 2 May 2018 / Published: 4 May 2018
(This article belongs to the Special Issue Obesity Prevention in Children and Adolescents)
Background: To examine bidirectional associations between body weight and objectively assessed sedentary behaviour (SB) and physical activity (PA) during the school year and summer vacation. Methods: Participants were 209 Japanese boys and girls (9.0 ± 1.8 years at baseline). SB and PA were measured using triaxial accelerometry that discriminated between ambulatory and non-ambulatory PA, screen time measured by questionnaire during the school-term was evaluated in May and the summer vacation, and relative body weight measured in May and just after the end of summer vacation. Results: There were no significant relationships between changes in SB or PA and changes in body weight. However, higher relative body weight at baseline was associated with decreased non-ambulatory moderate PA (p = 0.049), but this association was slightly diminished after adjusting for change in SB (p = 0.056). Longer screen time at baseline was also associated with increased relative body weight (p = 0.033). Conclusions: The present study revealed that body weight might be particularly influential on non-ambulatory moderate PA while SB, PA or changes in these variables did not predict changes in body weight. Moreover, screen time during the school year is a predictor of change in relative body weight during the subsequent summer vacation.
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Keywords:
adiposity; students; bidirectional
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
MDPI and ACS Style
Tanaka, C.; Reilly, J.J.; Tanaka, M.; Tanaka, S. Changes in Weight, Sedentary Behaviour and Physical Activity during the School Year and Summer Vacation. Int. J. Environ. Res. Public Health 2018, 15, 915.
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