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Left precordial isopotential mapping during supine exercise

D M Mirvis, F W Keller, J W Cox

    Circulation
    |August 1, 1977
    PubMed
    Summary
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    Physical exercise can cause junctional depression in healthy individuals. This study suggests it arises from competing repolarization and delayed depolarization forces during exercise.

    Area of Science:

    • Cardiology
    • Exercise Physiology
    • Electrophysiology

    Background:

    • Junctional depression is a common electrocardiographic finding during physical exertion in healthy individuals.
    • The underlying mechanisms of exercise-induced junctional depression remain incompletely understood.

    Purpose of the Study:

    • To investigate the pathogenesis of junctional depression observed during submaximal exercise stress tests in normal volunteers.
    • To elucidate the electrophysiological events contributing to ST segment changes during exercise.

    Main Methods:

    • Fifteen healthy volunteers underwent supine bicycle ergometer stress tests.
    • High-resolution electrocardiograms (ECGs) were recorded from 42 electrodes on the left anterior precordium.
    • Isopotential maps of the P-QRS-T intervals were constructed at rest and during exercise.

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    Main Results:

    • All subjects exhibited junctional depression during exercise, maximal along the lower left sternal border.
    • Early to mid-ST segment changes during exercise showed an intense minimum, continuous with terminal QRS forces.
    • Later ST segment changes revealed a decrease in this minimum, replaced by a maximum in the resting position.

    Conclusions:

    • Exercise-induced junctional depression likely results from the interplay between normal repolarization and delayed terminal depolarization forces.
    • These findings suggest a complex electrophysiological interaction influencing the ST segment during physical stress.
    • The study provides insights into the dynamic changes in cardiac electrical activity during exercise.