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Decrease in oxygen uptake at the end of a high-intensity submaximal running in humans.

S Perrey1, R Candau, G Y Millet

  • 1Laboratoire des Sciences du Sport, UFR STAPS, Besançon, France.

International Journal of Sports Medicine
|May 17, 2002
PubMed
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This study reveals a fourth phase in oxygen consumption (VO2) during intense running, showing a decrease before exhaustion in some athletes. This finding challenges existing models and suggests potential respiratory stress in endurance athletes.

Area of Science:

  • Exercise Physiology
  • Human Physiology
  • Sports Science

Background:

  • Classical models describe oxygen consumption (VO2) kinetics with three phases during severe-intensity exercise.
  • Previous research has occasionally noted a decrease in VO2 near exhaustion, but this phenomenon requires further investigation.

Purpose of the Study:

  • To investigate oxygen consumption (VO2) kinetics during severe-intensity running exercise using a novel four-phase model.
  • To analyze a previously observed decrease in VO2 at the end of exercise and its relationship with ventilatory responses.

Main Methods:

  • Thirteen highly trained males underwent maximal oxygen consumption (VO2 max) testing.
  • Participants performed square-wave running to exhaustion at ~95% VO2 max on a treadmill.
  • Breath-by-breath VO2 and ventilatory gas exchange were measured, analyzed with non-linear regression.

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Main Results:

  • A fourth phase, characterized by a significant VO2 decrease before exhaustion, was observed in 7 of 13 subjects (p < 0.01).
  • Following a delay, minute ventilation (VE) significantly decreased in 6 of these 7 subjects (p < 0.02).
  • Reduced tidal volume and increased breathing frequency were noted during the VE decrease, suggesting respiratory system strain.

Conclusions:

  • The findings support a four-phase model for VO2 kinetics during severe exercise, including a pre-exhaustion VO2 decline.
  • The data suggest that the respiratory system may be under significant stress in some endurance-trained athletes.
  • The precise relationship between reduced VO2 and reduced VE warrants further exploration.