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Related Experiment Videos

Changes in mechanical work during severe exhausting running.

Patrick Avogadro1, Ales Dolenec, Alain Belli

  • 1Laboratoire PPEH-GIP E2S, Faculté de médecine, 15 rue A Paré, 42055, St. Etienne cedex 2, France. patrick.avogadro@univ-st-etienne.fr

European Journal of Applied Physiology
|September 25, 2003
PubMed
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This study investigated oxygen uptake during running. Increased ventilation, not muscular work, explained the rise in oxygen uptake over time during exhaustive running exercise.

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Physiology

Background:

  • Oxygen uptake (VO2) increases during prolonged exercise.
  • The underlying physiological mechanisms driving this increase, particularly during running, require further elucidation.
  • Understanding these mechanisms is crucial for optimizing training and performance.

Purpose of the Study:

  • To investigate the contribution of muscular work to the sustained increase in oxygen uptake during running to exhaustion.
  • To differentiate the roles of mechanical factors and physiological responses in elevated VO2.

Main Methods:

  • 11 adult males ran to exhaustion at 90% of maximal aerobic velocity on a treadmill.
  • Measurements included ground reaction forces, expired gases (VO2), and leg muscle EMG at 3 minutes and during the final minute.

Related Experiment Videos

  • Data analysis focused on changes in VO2, ventilation, mechanical work, and integrated EMG.

    • Main Results:

    • Subjects experienced a significant increase in VO2 from minute 3 to exhaustion.
    • Increased ventilation accounted for approximately 41% of the rise in VO2.
    • No significant changes were observed in mechanical work or integrated EMG, despite a slight decrease in stride frequency.

    Conclusions:

    • The sustained increase in oxygen uptake during exhaustive running is primarily driven by increased ventilation.
    • Muscular work, as measured by mechanical work and integrated EMG, does not significantly increase over time to explain the VO2 drift.
    • These findings suggest that factors beyond direct muscle work contribute to the elevated VO2 during prolonged running.