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Predicted values for clinical exercise testing.

J E Hansen, D Y Sue, K Wasserman

    The American Review of Respiratory Disease
    |February 1, 1984
    PubMed
    Summary
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    This study defines normal cardiorespiratory responses during maximal exercise in 77 healthy men. Key findings include specific thresholds for breathing reserve, arterial oxygen, and anaerobic threshold, crucial for exercise physiology research.

    Area of Science:

    • Cardiorespiratory Physiology
    • Exercise Science
    • Occupational Health

    Background:

    • Shipyard workers often have occupational exposures impacting cardiorespiratory health.
    • Establishing normative data for cardiorespiratory responses during maximal exercise is essential for accurate health assessments.
    • Previous studies may lack comprehensive data on diverse populations undergoing rigorous exercise testing.

    Purpose of the Study:

    • To define normal cardiorespiratory and blood gas responses during maximal exercise in a cohort of healthy former shipyard workers.
    • To establish reference ranges for key physiological parameters at maximal exertion.
    • To identify predictors of maximal oxygen uptake and oxygen pulse in overweight individuals.

    Main Methods:

    • Cardiorespiratory evaluation at rest and during maximal cycle ergometry in 77 healthy men (mean age 54).

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  • Continuous noninvasive cardiorespiratory monitoring and intermittent intra-arterial blood pressure and blood gas measurements.
  • Assessment included history, physical exam, ECG, chest X-ray, pulmonary function tests, and exercise performance metrics.

    • Main Results:

    • Normal maximal exercise parameters included breathing reserve > 11 L/min, arterial PO2 > 80 mm Hg, alveolar-arterial PO2 difference < 38 mm Hg, and dead space/tidal volume ratio < 0.28.
    • The normal anaerobic threshold/maximal oxygen uptake ratio exceeded 40%.
    • Maximal exercise increased systolic and diastolic blood pressures by an average of 68 and 13 mm Hg, respectively. Age and height were better predictors of maximal oxygen uptake and oxygen pulse in overweight men than age and weight.

    Conclusions:

    • This study provides valuable normative data for cardiorespiratory responses during maximal exercise in a specific adult male population.
    • The findings highlight specific physiological thresholds indicative of a normal cardiorespiratory system during intense exercise.
    • Using age and height is recommended over age and weight for predicting maximal oxygen uptake and oxygen pulse in overweight individuals.