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A differential catecholamine response during prolonged exercise and passive heating

S K Powers, E T Howley, R Cox

    Medicine and Science in Sports and Exercise
    |January 1, 1982
    PubMed
    Summary
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    Elevated core temperature during exercise significantly increases plasma norepinephrine (NE) but not epinephrine (E). Combined heat and exercise amplify the sympathetic nervous system response, impacting catecholamine levels.

    Area of Science:

    • Exercise Physiology
    • Environmental Physiology
    • Neuroendocrinology

    Background:

    • Plasma catecholamines (Ca) rise during prolonged exercise.
    • Potential contributing factors include hypoglycemia, dehydration, perceived exertion, and elevated body temperature.

    Purpose of the Study:

    • To investigate the specific contribution of elevated core temperature to plasma catecholamine responses during prolonged exercise.
    • To differentiate the effects of heat stress versus exercise alone on catecholamine levels.

    Main Methods:

    • Four trained men performed 45 minutes of cycling exercise at ~60% VO2max under two conditions: heat stress (nylon shell) and thermoneutral (fans).
    • Passive heating via a hot water bath was also conducted.
    • Plasma norepinephrine (NE) and epinephrine (E) concentrations were measured.

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    Main Results:

    • Exercise with heat stress significantly elevated plasma NE compared to thermoneutral exercise (P < 0.05).
    • Plasma E did not differ significantly between heat stress and thermoneutral exercise conditions.
    • Passive heating caused minimal changes in plasma E and NE.
    • The combined stress of exercise and heat produced a greater NE increase than the sum of individual stressors, suggesting synergistic effects.

    Conclusions:

    • Elevated core temperature during exercise augments plasma norepinephrine response.
    • The sympathetic nervous system response to combined exercise and heat stress is amplified.
    • Heat stress appears to differentially affect plasma NE and E concentrations during exercise.