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Central and peripheral hemodynamics during maximal leg extension exercise.

D S Miles, J J Owens, J C Golden

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1987
    PubMed
    Summary
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    Maximal leg extension exercise increased blood pressure and total peripheral resistance. Stroke volume and cardiac output varied with exercise phase, indicating muscle forces impact cardiovascular response.

    Area of Science:

    • Exercise Physiology
    • Cardiovascular Physiology
    • Hemodynamics

    Background:

    • Understanding central and peripheral hemodynamic responses to exercise is crucial for optimizing training protocols.
    • Leg extension exercise presents a unique model for studying muscle-specific hemodynamic adaptations.

    Purpose of the Study:

    • To investigate the central and peripheral hemodynamic adaptations during maximal leg extension exercise.
    • To analyze the influence of exercise phases (concentric and eccentric) on stroke volume and cardiac output.

    Main Methods:

    • Seventeen healthy men performed maximal leg extension exercise to fatigue.
    • Impedance cardiography was utilized for beat-by-beat measurement of cardiac output and stroke volume.
    • Hemodynamic parameters including blood pressure and heart rate were continuously monitored.

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    Main Results:

    • Significant increases in systolic, diastolic, mean arterial pressure, total peripheral resistance, and heart rate were observed.
    • Mean cardiac output remained stable, while stroke volume decreased despite enhanced myocardial contractility.
    • Stroke volume and cardiac output were lower during the lifting (concentric) phase compared to the lowering (eccentric) phase.

    Conclusions:

    • Maximal leg extension exercise elicits substantial increases in arterial pressure and peripheral resistance.
    • The phase-dependent variations in stroke volume and cardiac output suggest that muscle-generated static forces impede venous return and increase afterload.
    • These findings highlight the complex interplay between muscle activity and cardiovascular regulation during resistance exercise.