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Muscle fatigue and lactic acid accumulation.

K Sahlin

    Acta Physiologica Scandinavica. Supplementum
    |January 1, 1986
    PubMed
    Summary

    Intense exercise leads to lactic acid buildup, decreasing muscle pH. Muscle fatigue is linked to impaired energy production and ion balance, not just acidity.

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    Area of Science:

    • Exercise Physiology
    • Biochemistry
    • Muscle Metabolism

    Background:

    • Lactic acid and H+ ions accumulate in muscle during high-demand exercise.
    • Muscle fatigue is a complex phenomenon influenced by metabolic changes.

    Purpose of the Study:

    • To investigate the relationship between muscle acidosis, energy metabolism, and fatigue during intense exercise.
    • To elucidate the mechanisms underlying impaired muscle function under hypoxic conditions.

    Main Methods:

    • Analysis of muscle pH, phosphocreatine (PCr), and adenine nucleotide levels during fatiguing exercise.
    • Examination of the effects of H+ concentration on key enzymes like phosphofructokinase and creatine kinase.
    • Assessment of the role of Na-K-ATPase function and ionic balance.

    Main Results:

    • Muscle pH drops to 6.4-6.6 during fatigue, but force generation is more related to PCr levels than H+ concentration.
    • Phosphofructokinase inhibition by H+ is overcome by AMP and ADP; high H+ decreases PCr.
    • Reduced ADP rephosphorylation rates and impaired Na-K-ATPase function contribute to altered ionic balance and fatigue.

    Conclusions:

    • Muscle fatigue results from an insufficient rate of ADP rephosphorylation, leading to blocks in activation or excitation/contraction coupling.
    • Acidosis impacts glycolysis and PCr levels, affecting energy supply and muscle function.
    • Altered ionic balance due to impaired Na-K-ATPase function exacerbates muscle fatigue.

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