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Declines in Physical Activity and Cardiorespiratory Fitness After Implementing new National School Guidelines
Keisuke Kuwahara1, Shiho Amagasa2, Kazue Yamaoka2
1Teikyo University Graduate School of Public Health, Itabashi-ku, Tokyo, Japan; Department of Health Data Science, Graduate School of Data Science, Yokohama City University, Yokohama, Kanagawa, Japan.
Purpose:
We examined whether introduction of national guidelines limiting sports club activities at school was associated with adolescents' exercise and cardiorespiratory fitness.
Methods:
We conducted interrupted time-series analysis to quantify the changes in prefecture-level aggregated data on exercise or sports activities and 20-m shuttle run (indicator of cardiorespiratory fitness) among adolescents in Japan before (2013-2017) and after (2018-2022) the introduction of the guidelines using data from the National Survey of Physical Fitness, Athletic Performance and Exercise Habits.
Results:
The introduction of the guidelines was associated with reductions in exercise and sports activities duration (boys, -4.8 [95% CI -5.9, -3.8] min/day; girls, -5.5 [95% CI -6.2, -4.8] min/day) and performance of 20-m shuttle run (boys, -1.2 [95% CI -1.4, -1.0] laps; girls, -2.3 [95% CI -2.5, -2.2] laps).
Discussion:
After introducing guidelines limiting sports club activities at school, levels of exercise or sports and cardiorespiratory fitness declined among adolescents.
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