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Disorders of the Skeletal Muscle01:28

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Induction and Assessment of Exertional Skeletal Muscle Damage in Humans
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Relationship between exercise time and musculoskeletal problems in children.

Yohei Tomaru1, Hiroshi Kamada1,2, Yuta Tsukagoshi1

  • 1Department of Orthopaedic Surgery, Faculty of Medicine, University of Tsukuba, Japan.

Journal of Rural Medicine : JRM
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Summary

Excessive exercise increases children

Keywords:
childrenexercisemusculoskeletal system

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Area of Science:

  • Pediatric Sports Medicine
  • Exercise Physiology
  • Musculoskeletal Health

Background:

  • Understanding the optimal exercise duration for children is crucial for promoting physical health while preventing injuries.
  • Existing research lacks specific guidelines on exercise volume for different age groups in elementary and junior high school students.
  • Musculoskeletal problems in children can impact long-term physical development and activity levels.

Purpose of the Study:

  • To investigate the correlation between weekly exercise duration and the incidence of musculoskeletal issues in school-aged children.
  • To establish evidence-based recommendations for appropriate exercise volumes across different school levels (elementary and junior high).
  • To identify potential thresholds for exercise that may increase injury risk in pediatric populations.

Main Methods:

  • A large-scale survey was conducted using mark-sheet questionnaires distributed to elementary and junior high schools in two cities.
  • Data from 22,494 participants were analyzed to assess the relationship between exercise time and musculoskeletal problems.
  • Statistical analyses included the chi-squared test and multivariate logistic regression to determine significant associations.

Main Results:

  • The average exercise time outside of physical education was 3.1 hours per week, with 56% of children exercising less than 2 hours.
  • Sports injury rates increased with higher exercise durations, but measures of balance and muscle strength (one-leg stand) also improved.
  • Specific injury cut-off points for exercise duration varied by age and sex, with higher thresholds for older students and boys.

Conclusions:

  • While regular physical activity benefits children's health, excessive exercise can lead to musculoskeletal problems.
  • Approximately 7 hours of exercise per week is suggested for junior high students.
  • Exercise recommendations for elementary school students require careful consideration due to their developing musculoskeletal systems.