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Related Experiment Videos

Mechanical energy assessment with different methods during running

A Belli1, J Avela, P V Komi

  • 1Laboratoire de Physiologie-G.I.P. Exercice, Faculté de Médecine de Lyon Sud, Oullins, France.

International Journal of Sports Medicine
|July 1, 1993
PubMed
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Comparing running mechanics, this study found kinematic arm measurements closely matched force platforms. Film analysis showed greater discrepancies, highlighting the kinematic arm

Area of Science:

  • Biomechanics of human locomotion
  • Sports science and performance analysis
  • Exercise physiology

Background:

  • Accurate measurement of mechanical work during running is crucial for understanding energy expenditure and efficiency.
  • Discrepancies exist in the literature regarding running efficiency, potentially due to measurement methodologies.
  • Comparing different measurement tools is essential for validating data in biomechanical research.

Purpose of the Study:

  • To compare external mechanical work (EW) calculations using force platforms, film analysis, and a kinematic arm during running.
  • To identify sources of error in EW computation methods.
  • To assess the suitability of the kinematic arm for measuring center of mass (CM) displacements and energy changes in runners.

Main Methods:

Related Experiment Videos

  • Two runners (sprint and long-distance) performed running trials at velocities from 2.5 to 5.5 m/s.
  • External mechanical work was computed using force platforms, film analysis, and a kinematic arm.
  • A multisegment model was employed to analyze data and compare findings with existing literature.

Main Results:

  • Differences in EW computations varied: 12.3% +/- 2.5% (film analysis vs. kinematic arm) and 1.4% +/- 1.8% (kinematic arm vs. force platforms).
  • Inaccuracies in film analysis and vertical oscillations of the kinematic arm contributed to observed differences.
  • The study suggests that variations in estimating muscle mechanical power, not measurement accuracy, cause discrepancies in running efficiency literature.

Conclusions:

  • The kinematic arm principle is effective for calculating center of mass (CM) displacements and energy changes during running.
  • Force platforms and kinematic arms provide comparable EW measurements, while film analysis is less accurate.
  • Future research on running efficiency should focus on standardized methods for estimating muscle power output.