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Decrease in liver norepinephrine in response to exercise and hypoglycemia.

W W Winder, M A Beattie, C Piquette

    The American Journal of Physiology
    |June 1, 1983
    PubMed
    Summary
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    The sympathetic nervous system in the liver is activated by exercise and hypoglycemia. Endurance training reduces this activation, suggesting a role for liver sympathetics in metabolic regulation.

    Area of Science:

    • Physiology
    • Neuroendocrinology
    • Metabolic Regulation

    Background:

    • Sympathetic innervation of the liver is established.
    • Its precise role in liver metabolism remains unclear.

    Purpose of the Study:

    • Identify physiological conditions that activate liver sympathetic nerves.
    • Investigate the impact of endurance training on this activation.

    Main Methods:

    • Measured liver norepinephrine (NE) levels in rats under various conditions.
    • Included swimming, treadmill running, fasting, and insulin-induced hypoglycemia.
    • Compared trained and untrained rats during exercise.

    Main Results:

    • Liver NE significantly decreased with swimming, running, and hypoglycemia.

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  • Endurance-trained rats showed no decrease in liver NE during exercise, unlike untrained rats.

    • Conclusions:

    • Liver sympathetic nerves activate in response to exercise and hypoglycemia.
    • Endurance training attenuates exercise-induced sympathetic activation of the liver.