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Related Experiment Videos

A comparison of pulmonary function tests in detecting exercise-induced bronchoconstriction.

J M Buckley, J F Souhrada

    Pediatrics
    |November 1, 1975
    PubMed
    Summary

    Specific airway conductance (SGaw), maximum mid expiratory flow (MMEF), and closing volume (CV) best detect exercise-induced airway obstruction in asthmatic boys. Flow-volume curves are sensitive but depend on MMEF and SGaw changes.

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    Area of Science:

    • Pulmonary Medicine
    • Pediatric Respiratory Research
    • Exercise Physiology

    Background:

    • Exercise can exacerbate airway obstruction in asthmatic individuals.
    • Pulmonary function tests (PFTs) are used to assess airway caliber changes.
    • The sensitivity of various PFTs in detecting post-exercise airway obstruction requires further comparison.

    Purpose of the Study:

    • To compare the efficacy of multiple PFTs in identifying airway obstruction post-exercise.
    • To investigate the relationship between traditional PFTs and flow-volume parameters after exercise in asthmatic children.

    Main Methods:

    • Two studies were conducted involving asthmatic boys undergoing treadmill exercise.
    • Pulmonary function parameters including FVC, FEV1, MMEF, SGaw, and CV were measured pre- and post-exercise.

    Related Experiment Videos

  • Flow-volume parameters were compared with spirometry (MMEF) and body plethysmography (SGaw) measurements.

    • Main Results:

    • Specific airway conductance (SGaw), maximum mid expiratory flow (MMEF), and closing volume (CV) demonstrated the highest sensitivity to post-exercise airway caliber changes.
    • Forced expiratory volume in one second (FEV1) and forced vital capacity (FVC) showed less significant changes.
    • Flow-volume curves correlated with MMEF and SGaw when both were reduced post-exercise, but not when only one was affected.

    Conclusions:

    • SGaw, MMEF, and CV are superior indicators of exercise-induced airway obstruction in asthmatic children.
    • Flow-volume curves can adequately reflect airway obstruction under specific conditions but may be less sensitive than traditional PFTs in other scenarios.