Compositional isotemporal substitution effects of recess physical activity on mental health among junior high school students

WANG Siji; ZHANG Xiubing; SONG Yingzhe; CHEN Jiu; WANG Yibing; LIN Yanmin; XIE Jun

doi:10.16835/j.cnki.1000-9817.2025240

Volume 46 Issue 8

Aug. 2025

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WANG Siji, ZHANG Xiubing, SONG Yingzhe, CHEN Jiu, WANG Yibing, LIN Yanmin, XIE Jun. Compositional isotemporal substitution effects of recess physical activity on mental health among junior high school students[J]. CHINESE JOURNAL OF SCHOOL HEALTH, 2025, 46(8): 1120-1124. doi: 10.16835/j.cnki.1000-9817.2025240

Citation:

WANG Siji, ZHANG Xiubing, SONG Yingzhe, CHEN Jiu, WANG Yibing, LIN Yanmin, XIE Jun. Compositional isotemporal substitution effects of recess physical activity on mental health among junior high school students[J]. CHINESE JOURNAL OF SCHOOL HEALTH, 2025, 46(8): 1120-1124. doi: 10.16835/j.cnki.1000-9817.2025240

Citation:

WANG Siji, ZHANG Xiubing, SONG Yingzhe, CHEN Jiu, WANG Yibing, LIN Yanmin, XIE Jun. Compositional isotemporal substitution effects of recess physical activity on mental health among junior high school students[J]. CHINESE JOURNAL OF SCHOOL HEALTH, 2025, 46(8): 1120-1124. doi: 10.16835/j.cnki.1000-9817.2025240

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Compositional isotemporal substitution effects of recess physical activity on mental health among junior high school students

doi: 10.16835/j.cnki.1000-9817.2025240

1.
Institute of Physical Education and Training of Capital University of Physical Education and Sports, Beijing 100191, China

Received Date: 2025-04-16
Rev Recd Date: 2025-06-04

Available Online: 2025-08-30

Publish Date: 2025-08-25

Abstract

Abstract

Objective To explore the isotemporal substitution effects among different intensities of physical activity within a 10-minute recess period on the mental health of junior high school students, aiming to provide evidence-based references for targeted practical interventions. Methods From May to November 2024, a total of 845 junior high school students from Tianjin, Taiyuan and LV Liang in Shaanxi Province, Puyang in Henan Province, Xi'an in Shaanxi Province, Quzhou in Zhejiang Province, and Chaoyang in Liaoning Province were selected by using a combination of stratified random sampling and convenience sampling. ActiGraph wGT3X-BT accelerometers was used to measure physical activity during a 10-minute recess period. Mental health status was assessed with the Depression Anxiety Stress Scale (DASS-21). An isotemporal substitution model was constructed in 1-minute increments to predict the effects of substituting different physical activity behaviors on students' mental health. Results During recess, sedentary behavior (SB) was predominant among junior high school students, with an average duration of [7.08(5.85, 7.98)] minutes, while moderate-to-vigorous physical activity (MVPA) accounted for the shortest duration at [0.42(0.21, 0.85)] minutes. There were statistically significant differences in MVPA, LPA and SB time between students of different genders and grades(Z/H=-9.08, -8.34, -9.51;84.87, 126.82, 135.27, all P < 0.01). Isotemporal substitution analysis, adjusted for gender and age, showed that replacing 1 minute of SB with 1 minute of MVPA significantly improved anxiety levels (β=-0.29, 95%CI=-0.53 to -0.04) and overall mental health (β=-0.72, 95%CI=-1.39 to -0.04), with both results reaching statistical significance (both P < 0.05). No significant effects were observed for other substitution patterns (both P>0.05). Conclusions Substituting SB with MVPA during a 10-minute recess period exerts a positive impact on the mental health of junior high school students. It is recommended to optimize the daily recess activity structure in schools to enhance students' mental well-being.
- Motor activity,
- Mental health,
- Isotemporal substitution,
- Students

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References(21)

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