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Hyperventilation or exercise to induce asthma?

P M Tweeddale, D J Godden, I W Grant

    Thorax
    |August 1, 1981
    PubMed
    Summary
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    Isocapnic hyperventilation with dry air effectively induces bronchoconstriction in asthma patients, showing reproducible results comparable to exercise but with less physical demand. This method offers a more acceptable stimulus for assessing airway hyperresponsiveness.

    Area of Science:

    • Respiratory Medicine
    • Pulmonology
    • Clinical Physiology

    Background:

    • Asthma is characterized by airway hyperresponsiveness.
    • Exercise is a common method to induce bronchoconstriction for diagnostic purposes.
    • Alternative, less demanding methods for assessing airway reactivity are needed.

    Purpose of the Study:

    • To evaluate isocapnic hyperventilation with dry air as a potent and reproducible stimulus for inducing bronchoconstriction in asthma patients.
    • To compare the efficacy and patient acceptability of this method against exercise-induced bronchoconstriction.

    Main Methods:

    • Asthmatic patients underwent isocapnic hyperventilation with dry air.
    • Bronchoconstriction was assessed by measuring the fall in forced expiratory volume in one second (FEV1).

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  • Responses were compared to those obtained after exercise challenges.

    • Main Results:

    • Isocapnic hyperventilation with dry air induced a significant and reproducible fall in FEV1 (mean 36%).
    • The responses were consistent both within and between days.
    • This method was found to be physically less demanding and more acceptable to patients compared to exercise.

    Conclusions:

    • Isocapnic hyperventilation with dry air is a potent, reproducible, and well-tolerated method for inducing bronchoconstriction in asthma.
    • This technique provides a valuable alternative to exercise challenge for assessing airway hyperresponsiveness in asthmatic individuals.