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Related Experiment Videos

Variability of exercise performance during long-term placebo treatment.

B F McGraw, J A Hemberger, A L Smith

    Clinical Pharmacology and Therapeutics
    |September 1, 1981
    PubMed
    Summary

    Frequent exercise treadmill testing over six months did not alter maximal heart rate or double product in stable angina patients. However, exercise duration significantly increased, suggesting improved exercise tolerance with repeated testing.

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    Area of Science:

    • Cardiology
    • Exercise Physiology

    Background:

    • Exercise testing is crucial for evaluating antianginal drug efficacy.
    • Limited data exists on the impact of frequent exercise testing over extended periods.

    Purpose of the Study:

    • To investigate the effects of repeated exercise treadmill testing over six months on cardiovascular parameters in patients with stable angina pectoris.
    • To assess the reproducibility of maximal heart rate, double product, and exercise duration with frequent testing.

    Main Methods:

    • Ten patients with stable angina pectoris underwent treadmill testing every two weeks for six months.
    • A modified Bruce protocol was used, with exercise continuing until anginal pain or 1 mm ST depression.
    • Maximal heart rate, double product, and exercise duration were recorded.

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    Main Results:

    • Maximal heart rate and double product remained consistent throughout the six-month study period.
    • Exercise duration progressively increased from a mean of 7.8 minutes at two weeks to 9.9 minutes at six months.
    • These findings indicate reproducible measurements for heart rate and double product.

    Conclusions:

    • Repeated exercise treadmill testing over six months demonstrates stable maximal heart rate and double product measurements.
    • Progressive increases in exercise duration suggest potential improvements in exercise tolerance or adaptation to testing.
    • Exercise testing can provide reproducible physiological data over time in stable angina patients.