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Mechanical efficiency in athletes during running

H Kyröläinen1, P V Komi, A Belli

  • 1Department of Biology of Physical Activity, University of Jyväskylä, Finland.

Scandinavian Journal of Medicine & Science in Sports
|August 1, 1995
PubMed
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This study found no significant difference in mechanical efficiency (ME) between power-trained and endurance-trained athletes. However, metabolic responses varied, highlighting differences in running economy despite similar biomechanics.

Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Mechanical efficiency (ME) is crucial for athletic performance.
  • Understanding ME differences between training types informs training strategies.
  • Biomechanical and metabolic factors influence running economy.

Purpose of the Study:

  • Compare external mechanical efficiency (ME) in power-trained vs. endurance-trained athletes.
  • Investigate relationships between biomechanical variables and metabolic cost during running.
  • Analyze differences in ME across various running speeds and surfaces.

Main Methods:

  • Recruited 5 power-trained and 5 endurance-trained athletes.
  • Measured ME during treadmill and track running at 2.50, 3.25, and 4.00 m/s.

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  • Assessed external work via kinematics, energy expenditure via oxygen consumption, and biomechanics via ground reaction forces, joint angles, and EMG.

    • Main Results:

    • No significant differences in mean ME were found between the groups due to high interindividual variance.
    • Metabolic responses (heart rate, ventilation, oxygen uptake) differed significantly between athletic groups.
    • Most biomechanical variables (EMG, step length, center of gravity displacement) did not differ significantly.

    Conclusions:

    • Despite differing metabolic responses, power and endurance athletes exhibit similar mechanical efficiency during running.
    • High interindividual variability in ME masks potential group differences.
    • Further research is needed to elucidate the complex interplay between biomechanics, metabolism, and ME in different athlete types.