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The effect of repeat exercise on pulmonary diffusing capacity and EIH in trained athletes

D C McKenzie1, I L Lama, J E Potts

  • 1Allan McGavin Sports Medicine Centre and the School of Human Kinetics, The University of British Columbia, Vancouver, Canada. kari@interchange.ubc.ca

Medicine and Science in Sports and Exercise
|February 2, 1999
PubMed
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Repeated heavy exercise significantly decreases pulmonary diffusing capacity, but does not worsen exercise-induced arterial hypoxemia in endurance athletes. These findings question the interpretation of post-exercise pulmonary diffusion measurements.

Area of Science:

  • Exercise Physiology
  • Pulmonary Function Testing
  • Gas Exchange

Background:

  • Repeated bouts of heavy exercise can impact pulmonary function.
  • Understanding the effects on diffusing capacity and arterial oxygen saturation is crucial for athletes.

Purpose of the Study:

  • To investigate the impact of consecutive heavy exercise sessions on post-exercise pulmonary diffusing capacity (DL).
  • To determine the development of exercise-induced arterial hypoxemia (EIH) following repeated strenuous exercise.

Main Methods:

  • 13 male endurance athletes completed two maximal cycle ergometer tests separated by 60 minutes of recovery.
  • Pulmonary diffusing capacity (DL) and arterial oxygen saturation (%SaO2) were measured before and after each exercise bout.

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Main Results:

  • Peak power output slightly decreased in the second exercise bout.
  • Pulmonary diffusing capacity (DL), membrane diffusing capacity (DM), and pulmonary capillary volume (VC) significantly decreased after the first exercise bout and further after the second.
  • %SaO2 decreased during exercise but showed no significant difference between the two tests.

Conclusions:

  • Post-exercise measurements of pulmonary diffusing capacity may not accurately reflect pulmonary gas exchange or fluid accumulation during exercise.
  • The lack of further decrease in %SaO2 suggests that any potential interstitial edema was not clinically significant, or changes in DL are related to blood flow redistribution rather than edema.