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Pulmonary function changes following exercise.

J A O'Kroy1, R A Loy, J R Coast

  • 1Elouise Beard Smith Human Performance Laboratory, Department of Health and Kinesiology, Texas A&M University, College Station 77843.

Medicine and Science in Sports and Exercise
|December 1, 1992
PubMed
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Exercise intensity and duration impact lung function changes in runners. A combination of both may be necessary to reduce forced vital capacity (FVC) and indicate expiratory muscle fatigue after running.

Area of Science:

  • Exercise Physiology
  • Pulmonary Function Testing
  • Respiratory Muscle Physiology

Background:

  • Previous research indicates varied effects of exercise intensity and duration on lung function, specifically forced vital capacity (FVC).
  • The relationship between exercise-induced respiratory muscle fatigue and changes in pulmonary function remains an area of active investigation.

Purpose of the Study:

  • To determine if specific exercise intensities or durations elicit changes in FVC in active runners.
  • To investigate the potential link between respiratory muscle fatigue and exercise-induced alterations in pulmonary function.

Main Methods:

  • Active runners underwent three treadmill running protocols: a graded maximal test (7-14 min), a 7-min high-intensity test (90% maximal VO2), and a 30-min moderate-intensity test (60% maximal VO2).

Related Experiment Videos

  • Pulmonary function was assessed by measuring maximal inspiratory pressures (MIP), maximal expiratory pressures (MEP), forced expiratory volume in 1 second (FEV1.0), and FVC at pre-test and at 5, 10, and 30 minutes post-exercise.

    • Main Results:

    • No significant differences in MIP were observed across different times or intensities.
    • A trend towards decreased MEP was noted 10 minutes post-exercise, approaching statistical significance (P = 0.0569), with no intensity-dependent differences.
    • FVC showed significant reductions at 5 and 10 minutes post-exercise compared to pre-test and 30-minute values, although not differing between intensities. FEV1.0 was significantly reduced at 5 and 10 minutes post-exercise.

    Conclusions:

    • A combination of exercise duration and intensity may be required to induce significant changes in pulmonary function post-exercise.
    • Expiratory muscle fatigue appears to be a contributing factor to the observed reductions in FVC following strenuous exercise.