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Hydration effects on muscle response.

H Hasan, J Unsworth

    Physiological Chemistry and Physics and Medical NMR
    |January 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Hypotonic solutions initially boost toad muscle force and stiffness by altering ATP-ase activity. However, excessive hypotonicity below 0.6 R causes these muscle functions to decline.

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    Area of Science:

    • Muscle physiology
    • Cellular biophysics
    • Biochemistry

    Background:

    • Sartorius muscles in amphibians are frequently used models for studying muscle contraction.
    • Muscle performance is sensitive to osmotic conditions.
    • Adenosine triphosphatase (ATP-ase) activity is crucial for muscle contraction.

    Purpose of the Study:

    • To investigate the impact of varying hypotonicity on toad sartorius muscle contractile properties.
    • To correlate changes in muscle function with alterations in ATP-ase activity.

    Main Methods:

    • Isolated toad sartorius muscles were bathed in solutions of decreasing tonicity (ranging from 1.0 R to below 0.6 R).
    • Measurements included twitch force, tetanus force, and active stiffness.
    • ATP-ase activity was assessed under different osmotic conditions.

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    Main Results:

    • Muscle twitch, tetanus force, and active stiffness increased as tonicity decreased from 1.0 R to 0.6 R.
    • Further decreases in tonicity below 0.6 R led to a reduction in these contractile parameters.
    • These functional changes were correlated with observed alterations in ATP-ase activity.

    Conclusions:

    • Muscle contractile function in toad sartorius is optimized at an intermediate level of hypotonicity (around 0.6 R).
    • Deviations from this optimal tonicity, particularly towards greater hypotonicity, impair muscle performance.
    • The observed effects are likely mediated by changes in ATP-ase activity influenced by osmotic pressure.