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Adrenaline secretion during exercise.

J B Warren, N Dalton, C Turner

    Clinical Science (London, England : 1979)
    |January 1, 1984
    PubMed
    Summary
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    During mild to moderate exercise, plasma adrenaline levels do not significantly increase. This is because adrenaline clearance from the blood decreases during exercise, not due to reduced secretion by the adrenal medulla.

    Area of Science:

    • Exercise Physiology
    • Endocrinology
    • Human Physiology

    Background:

    • Venous plasma adrenaline levels typically rise during strenuous exercise.
    • The relationship between exercise intensity and adrenaline secretion/clearance is not fully understood.

    Purpose of the Study:

    • To investigate the dynamics of plasma adrenaline levels during graded treadmill exercise.
    • To determine the impact of moderate exercise on adrenaline clearance and secretion.

    Main Methods:

    • Six healthy subjects performed graduated treadmill exercise.
    • Adrenaline was infused intravenously in resting and exercising subjects to measure plasma levels.
    • Plasma adrenaline concentrations were measured at various time points during infusion and exercise.

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    Main Results:

    • Plasma adrenaline showed minimal increase during mild to moderate treadmill exercise.
    • Intravenous adrenaline infusion resulted in elevated plasma levels in both resting and exercising states.
    • Adrenaline clearance from plasma was reduced during moderate exercise.
    • Adrenal medulla secretion did not significantly increase in response to mild or moderate exercise.

    Conclusions:

    • The lack of significant plasma adrenaline rise during moderate exercise is attributed to reduced clearance, not diminished secretion.
    • Adrenaline clearance is impaired during exercise.
    • Adrenal medulla secretion is not significantly stimulated by mild to moderate exercise.