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Related Experiment Videos

Rule modification in junior sport: Does it create differences in player movement?

Paul B Gastin1, Matthew D Allan1, Kylie Bellesini1

  • 1Centre for Sport Research, School of Exercise and Nutrition Sciences, Deakin University, Australia.

Journal of Science and Medicine in Sport
|April 6, 2017
PubMed
Summary

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Rule modifications in junior Australian football (AF) significantly reduce player movement and high-speed running (HSR). These changes decrease physical activity, necessitating compensatory measures to ensure adequate exercise for young athletes.

Area of Science:

  • Sports Science
  • Pediatric Exercise Physiology
  • Biomechanics

Background:

  • Junior Australian Football (AF) often involves modified rules to suit younger players.
  • The impact of these rule modifications on player movement intensity and volume requires investigation.

Purpose of the Study:

  • To investigate the effects of rule modifications on player movement during match play in junior Australian football.
  • To compare player movement variables between leagues compliant and non-compliant with modified junior sport policies.

Main Methods:

  • A quasi-experimental study utilizing time-motion analysis and GPS tracking.
  • Data collected from 145 junior players (7-12 years) across four leagues.
  • Analysis compared movement variables (total distance, high-speed running distance and efforts) between compliant and non-compliant leagues, with a matched U8 subset analysis.
Keywords:
ChildrenFootballHigh-speed runningModified rulesPhysical activityTime-motion analysis

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Main Results:

  • Leagues adhering to modified rules showed significantly less player movement compared to non-compliant leagues.
  • Significant differences in total distance, relative distance, and high-speed running (HSR) efforts were observed in the U8 subset.
  • Moderate to very large effect sizes (29-60%) indicated substantial reductions in physical activity with rule modifications.

Conclusions:

  • Rule modifications in junior AF demonstrably limit the extent and intensity of player movement.
  • Reduced physical activity due to rule changes should be addressed with supplementary activities.
  • Policy makers and administrators must balance the intended benefits of rule modifications against potential negative impacts on physical activity levels.