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Open AccessArticle

Changes in Weight, Sedentary Behaviour and Physical Activity during the School Year and Summer Vacation

Division of Integrated Sciences, J. F. Oberlin University, Tokyo 194-0294, Japan
Physical Activity for Health Group, School of Psychological Sciences & Health, University of Strathclyde, Glasgow G1 1QE, UK
Department of Child Education, Kyoto Seibo College, Kyoto 612-0878, Japan
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;
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. View Full-Text
Keywords: adiposity; students; bidirectional adiposity; students; bidirectional
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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