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Does the mechanical work in running change during the VO2 slow component?

Fabio Borrani1, Robin Candau, Stephane Perrey

  • 1Laboratoire Sport Performance et Santé, Faculté des Sciences du Sport, Université de Montpellier I, Montpellier, France. f.borrani@staps.univ-montp1.fr

Medicine and Science in Sports and Exercise
|January 25, 2003
PubMed
Summary

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The VO2 slow component in runners is not caused by increased external mechanical work during fatigue. Alternative explanations involve the cost of force generation or altered elastic energy storage and recoil.

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biomechanics

Background:

  • The origin of the VO2 slow component, an increase in oxygen consumption during sustained submaximal exercise, remains unclear.
  • The mechanical hypothesis suggests increased external work contributes to the VO2 slow component due to fatigue.

Purpose of the Study:

  • To investigate if changes in mechanical work occur during the development of the VO2 slow component under fatigue.
  • To test the mechanical hypothesis for the VO2 slow component in runners.

Main Methods:

  • Twelve competitive runners performed a square-wave transition to 95% of peak VO2 speed.
  • Oxygen uptake (VO2) was modeled using two exponential functions.
  • External work (W(ext)), kinetic work (W(kin)), potential work (W(pot)), and internal work (W(int)) were continuously measured using a force-measuring treadmill.

Related Experiment Videos

Main Results:

  • During the VO2 slow component, external work (W(ext)) significantly increased (P<0.01).
  • Internal work index (W(int)) significantly decreased (P<0.001).
  • Stride frequency and contact time significantly decreased (P<0.001).

Conclusions:

  • The VO2 slow component is not primarily driven by increased external mechanical work during fatigue in runners.
  • Decreased stride frequency and contact time suggest alternative mechanical factors.
  • The VO2 slow component may stem from the energetic cost of force production or altered elastic energy utilization, not external work changes.