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Action potential parameters affecting excitation-contraction coupling.

S R Taylor, H Preiser, A Sandow

    The Journal of General Physiology
    |April 1, 1972
    PubMed
    Summary
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    Zinc ions (Zn2+) quantitatively enhance muscle contraction by prolonging action potentials, affecting twitch tension and duration. Higher zinc concentrations reveal complex effects on excitation-contraction coupling and contractile strength.

    Area of Science:

    • Muscle physiology
    • Pharmacology
    • Biophysics

    Background:

    • Type B potentiation effects on muscle contraction were previously described qualitatively.
    • Understanding the quantitative relationship between ion concentration and muscle response is crucial.

    Purpose of the Study:

    • To quantify the effects of zinc ions (Zn2+) on muscle action potential duration and mechanical responses.
    • To elucidate the role of action potential phases in mechanical activation and excitation-contraction coupling.

    Main Methods:

    • Treatment of muscle preparations with varying concentrations of zinc ions (Zn2+) and eserine.
    • Measurement of action potential duration, twitch tension, and contraction time.
    • Analysis of the relationship between ion concentration and mechanical parameters.

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    Main Results:

    • Low Zn2+ (1-50 microM) increased action potential duration, twitch tension, and contraction time proportionally to the log of concentration.
    • Higher Zn2+ (up to 1000 microM) prolonged spike and contraction but reduced twitch tension, indicating altered excitation-contraction coupling and intrinsic strength.
    • Eserine and high Zn2+ slowed action potential rise, delaying tension onset before potentiation effects from spike prolongation became evident.

    Conclusions:

    • Action potential duration is a quantitative determinant of mechanical activation in isometric twitches.
    • Different phases of the action potential independently influence mechanical output, suggesting distinct mechanical transforms.
    • Excitation-contraction coupling involves a graded release of calcium ions (Ca2+) from the sarcoplasmic reticulum in both rate and amount.