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Increased protein degradation after eccentric exercise.

G J Kasperek, R D Snider

    European Journal of Applied Physiology and Occupational Physiology
    |January 1, 1985
    PubMed
    Summary
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    Eccentric exercise increases muscle damage and protein degradation, indicated by elevated enzyme activities like glucose 6-phosphate dehydrogenase (G6PDH) and N-acetyl-beta-glucosaminidase (NAG). Lysosomal enzymes may play a role in this exercise-induced muscle proteolysis.

    Area of Science:

    • Exercise Physiology
    • Biochemistry
    • Muscle Metabolism

    Background:

    • Eccentric exercise, characterized by muscle lengthening under tension, can induce significant muscle damage.
    • Understanding the biochemical markers of muscle damage and protein degradation is crucial for exercise science.

    Purpose of the Study:

    • To compare the activities of glucose 6-phosphate dehydrogenase (G6PDH) and N-acetyl-beta-glucosaminidase (NAG) in rat muscles post-exercise.
    • To assess protein degradation following eccentric exercise using the urinary 3-methylhistidine/creatinine ratio.

    Main Methods:

    • Measurement of G6PDH and NAG enzyme activities in rat muscles after eccentric exercise.
    • Analysis of urinary 3-methylhistidine/creatinine ratio as a marker of protein degradation.

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    Main Results:

    • Increased G6PDH activity correlated with a delayed and/or more prolonged increase in NAG activity.
    • Urinary 3-methylhistidine/creatinine ratio remained elevated for 3 days post-eccentric exercise, exceeding levels seen after level running.

    Conclusions:

    • Eccentric exercise leads to substantial muscle damage and subsequent protein degradation.
    • Lysosomal enzymes, such as NAG, are potentially involved in the proteolysis of exercise-damaged muscle tissue.