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Related Experiment Videos

Reliability of noninvlasive methods for measuring cardiac function in exercise.

L A Wolfe, D A Cunningham, G M Davis

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |January 1, 1978
    PubMed
    Summary

    Systolic time intervals (STI) and cardiac output measurements during exercise are reliable and reproducible in healthy men. These cardiovascular assessments show higher reliability during moderate to heavy exercise compared to light exercise.

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    Area of Science:

    • Cardiovascular Physiology
    • Exercise Physiology
    • Biomedical Engineering

    Background:

    • Systolic time intervals (STI) and cardiac output (CO) are key indicators of cardiac function.
    • Accurate measurement of cardiovascular parameters during exercise is crucial for understanding physiological responses.
    • Previous studies have explored the reliability of these measures, but further validation during varying exercise intensities is needed.

    Purpose of the Study:

    • To assess the reliability and reproducibility of externally recorded systolic time intervals (STI), indirect cardiac output (CO), and auscultatory blood pressure during upright bicycle ergometer exercise.
    • To evaluate left ventricular function using the mean systolic ejection rate (MSER).
    • To compare the reliability of these cardiovascular measurements across different exercise intensities (light, moderate, heavy).

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    Main Methods:

    • Twenty healthy men (aged 24-56 years) underwent measurements of STI, CO (via CO2 re-breathing), and blood pressure during steady-state upright bicycle ergometer exercise.
    • Exercise was performed at three distinct workloads: light (mean heart rate [HR] = 96 bpm), moderate (HR = 118 bpm), and heavy (HR = 147 bpm).
    • Measurements were repeated on two separate days to determine reliability coefficients.

    Main Results:

    • Heart-rate-corrected STI demonstrated good to excellent reliability and reproducibility (reliability coefficients 0.63–0.96).
    • Reliability for CO, stroke volume, MSER, and systolic blood pressure was acceptable, with higher coefficients observed during moderate and heavy exercise (r = 0.85–0.95) compared to light exercise (r = 0.60–0.83).
    • Mean systolic ejection rate served as a valid measure of left ventricular function.

    Conclusions:

    • Externally recorded STI, indirect CO, and blood pressure measurements are reliable and reproducible in healthy men during graded exercise.
    • Cardiovascular measurements exhibit enhanced reliability during moderate and heavy exercise intensities.
    • These non-invasive methods provide valuable insights into cardiac function and cardiovascular adaptation to exercise.