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Exercise responses following ozone exposure.

L J Folinsbee, F Silverman, R J Shephard

    Journal of Applied Physiology
    |June 1, 1975
    PubMed
    Summary
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    Ozone exposure alters exercise breathing patterns. Increased respiratory frequency and decreased tidal volume were observed, with effects dose-dependent on ozone concentration.

    Area of Science:

    • Environmental Health
    • Exercise Physiology
    • Respiratory Medicine

    Background:

    • Ozone (O3) is a respiratory irritant.
    • Understanding ozone's impact on exercise physiology is crucial for public health.

    Purpose of the Study:

    • To investigate the effects of varying ozone exposure levels on ventilatory responses during submaximal exercise.

    Main Methods:

    • 28 subjects underwent a three-stage ergometer test after 2-hour exposure to 0.37, 0.50, or 0.75 ppm ozone at rest or during intermittent exercise.
    • Continuous monitoring of ventilation, respiratory frequency, tidal volume, and ECG.

    Main Results:

    • No significant changes in oxygen consumption or minute ventilation were observed.
    • A dose-dependent increase in respiratory frequency and a decrease in tidal volume occurred following ozone exposure.

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  • The increase in respiratory frequency strongly correlated with ozone dose (r=0.98).

    • Conclusions:

    • Ozone's irritant properties modify ventilatory responses during exercise.
    • The observed changes in breathing pattern are a direct, dose-dependent effect of ozone exposure.