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Related Experiment Videos

Force-velocity relationship on a cycle ergometer and knee-extensor strength indices.

Tarak Driss1, Henry Vandewalle, Jean-Michel Le Chevalier

  • 1Laboratoire de Physiologie du Travail et du Sport, Faculté de Médecine Pitié-Salpêtrière, 91 Bd de l'Hôpital 75013 Paris, France.

Canadian Journal of Applied Physiology = Revue Canadienne De Physiologie Appliquee
|August 16, 2002
PubMed
Summary

The force-velocity relationship parameter F0, derived from cycle ergometry, shows significant correlations with maximal isometric voluntary force and isokinetic strength. However, its added value over maximal anaerobic power (Pmax) for assessing strength is questionable.

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Area of Science:

  • Sports Science
  • Biomechanics
  • Exercise Physiology

Background:

  • Maximal anaerobic power (Pmax) is commonly assessed using cycle ergometry, either through direct measurement or the force-velocity (F-V) relationship.
  • The F-V relationship in cycling is described by the equation V = V0(1-F/F0), where F0 represents the force axis intercept.

Purpose of the Study:

  • To investigate whether the F0 parameter from the cycling F-V relationship effectively reflects an athlete's strength ability.
  • To compare the correlation of F0 with various strength measures against the correlation of Pmax with the same measures.

Main Methods:

  • Two studies were conducted involving male athletes (volleyball players and general athletes).
  • Study 1: Assessed correlations between F0 and maximal isometric voluntary force (MVF) and maximal isometric rate of force development (MRFD) during knee extension.

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  • Study 2: Assessed correlations between F0 and peak torques in isokinetic knee extension at multiple angular velocities.

    • Main Results:

    • Significant positive correlations were found between F0 and MVF/MRFD in absolute and muscle mass-adjusted units.
    • F0 also showed significant correlations with isokinetic peak torques across various angular velocities, with stronger correlations when adjusted for muscle mass at higher velocities.
    • Correlation coefficients between Pmax and strength performances were similar to those between F0 and strength performances.

    Conclusions:

    • The F0 parameter derived from the cycling force-velocity relationship demonstrates significant associations with maximal isometric and isokinetic strength measures.
    • The additional benefit of measuring F0, beyond Pmax, for evaluating strength ability in athletes appears limited due to comparable correlation strengths.