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Related Experiment Videos

Issues in exercise-induced asthma.

S D Anderson

    The Journal of Allergy and Clinical Immunology
    |December 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Exercise and inhaled cold air trigger asthma through airway water loss, not heat loss. Increased fluid osmolarity stimulates mediator release, leading to bronchial smooth muscle contraction and asthma symptoms.

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    Area of Science:

    • Respiratory Medicine
    • Pulmonary Physiology
    • Asthma Pathophysiology

    Background:

    • Exercise-induced asthma (EIA) and inhaled cold air-induced asthma (HIA) are common conditions.
    • The precise mechanisms triggering bronchoconstriction in EIA and HIA remain under investigation.
    • Previous theories focused on airway cooling, but evidence for water loss as a primary stimulus is emerging.

    Purpose of the Study:

    • To elucidate the shared mechanism underlying exercise and inhaled cold air-induced asthma.
    • To determine whether airway water loss or heat loss is the primary trigger for bronchoconstriction.
    • To investigate the cellular and neural pathways involved in asthma induction by airway challenges.

    Main Methods:

    • The study likely involved controlled challenges with exercise and inhaled cold air in subjects with and without asthma.

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  • Measurements probably included airway osmolarity, bronchoactive mediator release, and neural pathway activation.
  • Pharmacological interventions may have been used to assess the role of specific receptors and pathways.

    • Main Results:

    • Both exercise and inhaled cold air challenges induce asthma via the same mechanism.
    • The protective effect of water vapor suggests events initiating smooth muscle contraction occur within the airway lumen.
    • Water loss, rather than heat loss, is identified as the primary stimulus for EIA and HIA, increasing epithelial fluid osmolarity.

    Conclusions:

    • Asthma induction by exercise and inhaled cold air is primarily driven by airway water loss, leading to increased epithelial fluid osmolarity.
    • This osmotic shift stimulates mast cells and epithelial cells to release bronchoactive substances.
    • Vagal afferent pathways are activated by osmolarity changes and mediators, with potential modulation of efferent activity by alpha-adrenoceptor antagonists and SCG.