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Related Experiment Videos

Mechanical power and efficiency in running children.

B Schepens1, P A Willems, G A Cavagna

  • 1Unité de Réadaptation, Université catholique de Louvain, Place Pierre de Coubertin, 1, 1348 Louvain-la-Neuve, Belgium.

Pflugers Archiv : European Journal of Physiology
|May 26, 2001
PubMed
Summary

Children running mechanics show age-independent total mechanical power output (Wtot) at lower speeds due to compensatory internal and external power. However, children exhibit higher Wtot at high speeds.

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Area of Science:

  • Biomechanics
  • Human Physiology
  • Pediatric Exercise Science

Background:

  • Understanding age-related differences in running biomechanics is crucial for pediatric sports science.
  • Mechanical power output (Wtot) is a key determinant of running performance.
  • Wtot comprises external power (Wext) for body movement and internal power (Wint) for limb movement.

Purpose of the Study:

  • To investigate the effects of age and body size on Wtot during running in children (3-12 years) and adults.
  • To analyze the contributions of Wext and Wint to Wtot across different running speeds.
  • To compare the mechanical efficiency of running between children and adults.

Main Methods:

  • Measured Wtot, Wext, and Wint during running in children and adults.

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  • Analyzed the influence of age, body size, and running speed on power outputs.
  • Calculated mechanical efficiency based on positive work production and energy consumption.

    • Main Results:

    • At low/intermediate speeds (<13 km/h), children's higher step frequency led to reduced mass-specific Wext and increased mass-specific Wint, making mass-specific Wtot age-independent.
    • At high speeds, mass-specific Wtot was 20-30% higher in children than adults.
    • Mechanical efficiency of positive work production was similar (0.40-0.55) in both groups.

    Conclusions:

    • Children's running Wtot is largely independent of age at sub-maximal speeds due to compensatory changes in internal and external power.
    • Children exhibit higher mass-specific Wtot at high speeds, potentially due to greater center-of-mass deceleration.
    • Running mechanical efficiency is comparable between children and adults.