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Pulmonary mechanics during exercise in normal males

D G Stubbing, L D Pengelly, J L Morse

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |September 1, 1980
    PubMed
    Summary
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    During steady-state exercise, residual volume increased significantly, while lung compliance decreased. These changes highlight the importance of measuring thoracic gas volume and lung elasticity during exercise testing.

    Area of Science:

    • Pulmonary physiology
    • Exercise physiology
    • Respiratory mechanics

    Background:

    • Pulmonary mechanics assessment is crucial for understanding respiratory function.
    • Exercise significantly impacts physiological parameters, including respiratory system function.
    • Limited data exists on concurrent measurements of thoracic gas volume and lung mechanics during steady-state exercise.

    Purpose of the Study:

    • To investigate changes in pulmonary mechanics during steady-state exercise.
    • To assess the relationship between thoracic gas volume and lung elasticity during physical exertion.
    • To evaluate the impact of exercise on lung volumes and airflow dynamics.

    Main Methods:

    • Utilized a body plethysmograph integrated with a cycle ergometer for simultaneous measurement.

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  • Recruited 12 healthy male subjects aged 22-65 years for steady-state exercise testing.
  • Measured pulmonary resistance, lung volumes (residual volume, functional residual capacity, total lung capacity), and expiratory flow-volume curves.

    • Main Results:

    • Residual volume increased significantly (119% of rest, P<0.01), while functional residual capacity and total lung capacity remained unchanged.
    • Dynamic and static expiratory pulmonary compliance decreased significantly (to 91.3% and 76.9% of control, respectively, P<0.05).
    • Pulmonary resistance and maximum expiratory flow-volume curves showed no significant changes during exercise.

    Conclusions:

    • Exercise leads to significant alterations in lung volumes and elastic properties, specifically increased residual volume and decreased compliance.
    • The observed decrease in pulmonary compliance may be attributed to increased pulmonary capillary blood volume.
    • Accurate assessment of pulmonary mechanics during exercise necessitates measuring absolute thoracic gas volume and lung elastic properties.