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Related Experiment Videos

Longitudinal changes in 11-13-year-olds' physical activity.

N Armstrong1, J R Welsman, B J Kirby

  • 1Children's Health and Exercise Research Centre, University of Exeter, UK. N.Armstrong@exeter.ac.uk

Acta Paediatrica (Oslo, Norway : 1992)
|August 16, 2000
PubMed
Summary

Physical activity (PA) declines in children aged 11-13 years, with girls becoming less active than boys. Promoting active lifestyles during youth is crucial for long-term health and well-being.

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Area of Science:

  • Pediatric Exercise Science
  • Adolescent Health
  • Physical Activity Research

Background:

  • Understanding factors influencing physical activity in pre-adolescents is vital for public health.
  • Longitudinal data on physical activity trends during early adolescence is limited.
  • Previous studies suggest potential sex differences in physical activity patterns.

Purpose of the Study:

  • To longitudinally examine the influence of age, sex, maturity, body mass, and body fatness on physical activity in 11-13-year-olds.
  • To identify age- and sex-related changes in moderate and vigorous physical activity.
  • To determine if body composition metrics predict physical activity levels.

Main Methods:

  • Longitudinal study design with annual measurements over three years.

Related Experiment Videos

  • Inclusion of 202, 143, and 160 participants in years 1-3, respectively.
  • Objective assessment of physical activity using 3-day continuous heart rate monitoring.
  • Multilevel regression modeling to analyze age-, sex-, and maturity-related changes in physical activity.

    • Main Results:

    • Physical activity, measured by time spent with heart rate above 139 bpm (moderate) and 159 bpm (vigorous), declined with age.
    • A consistent sex difference was observed, with girls exhibiting lower physical activity levels than boys.
    • Body mass and fatness were not significant predictors of physical activity.
    • An additional decrease in physical activity was noted during late maturity.

    Conclusions:

    • Few children engage in sustained periods of moderate to vigorous physical activity.
    • Physical activity levels decrease between ages 11 and 13, with a higher rate of inactivity among girls.
    • Interventions promoting active lifestyles in youth are essential to counter declining physical activity trends.