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Related Experiment Videos

Ammonia metabolism during exercise in man.

L S Eriksson, S Broberg, O Björkman

    Clinical Physiology (Oxford, England)
    |August 1, 1985
    PubMed
    Summary

    Exercise-induced hyperammonemia stems mainly from muscle ammonia release, not reduced liver removal. Muscle produces ammonia during exercise, which is then used for amino acid synthesis post-exercise.

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    Area of Science:

    • Exercise Physiology
    • Metabolic Biochemistry

    Background:

    • Physical activity elevates plasma ammonia levels.
    • The primary source of this ammonia increase (muscle production vs. liver clearance) remains unclear.

    Purpose of the Study:

    • To investigate the origin of exercise-induced hyperammonemia by examining ammonia exchange in leg and splanchnic tissues.
    • To determine whether muscle or liver is the main contributor to elevated ammonia during and after exercise.

    Main Methods:

    • Utilized the catheter technique in 11 healthy subjects.
    • Measured ammonia exchange at rest, during graded bicycle exercise (35-80% max oxygen uptake), and during post-exercise recovery.
    • Correlated ammonia levels with lactate and alanine concentrations.

    Main Results:

    • Arterial ammonia levels increased with exercise intensity, peaking at 84 +/- 12 mumol/l.
    • Leg tissues shifted from ammonia uptake to significant ammonia production during exercise.
    • Splanchnic (liver) ammonia uptake remained unchanged during exercise but increased post-exercise.
    • Ammonia levels correlated linearly with lactate and significantly with alanine.

    Conclusions:

    • Exercise-induced hyperammonemia is primarily due to ammonia release from exercising muscles.
    • Hepatic ammonia removal capacity is not significantly reduced during exercise.
    • Contracting muscles likely utilize some released ammonia for amino acid synthesis (glutamine, alanine).

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