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Catecholamine-fuel interrelationships during exercise in fasting men

J M Pequignot, L Peyrin, G Pérès

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |January 1, 1980
    PubMed
    Summary
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    Fasting increases plasma catecholamines and adrenergic activity during exercise, reducing working ability. This adrenergic response is linked to altered blood energetic substrates, impacting endurance in sedentary men.

    Area of Science:

    • Exercise Physiology
    • Endocrinology
    • Metabolic Studies

    Background:

    • Fasting significantly impacts metabolic and hormonal responses during physical exertion.
    • Understanding the adrenergic response to exercise under fasting conditions is crucial for performance and health insights.

    Purpose of the Study:

    • To investigate the adrenergic response to exercise in fasted sedentary men.
    • To examine the relationship between plasma catecholamines and blood energetic substrates during exercise post-fasting.
    • To assess the impact of fasting-induced adrenergic activity on exercise performance.

    Main Methods:

    • Sedentary men underwent 15 hours of fasting followed by maximal oxygen consumption testing on a bicycle ergometer.
    • Plasma catecholamine (epinephrine and norepinephrine) levels were measured at rest and during exercise.

    Related Experiment Videos

  • Blood glucose, lactate, glycerol, and free fatty acid concentrations were analyzed.

    • Main Results:

    • Fasting diminished working ability and increased resting plasma norepinephrine levels.
    • Exercise resulted in significantly higher plasma epinephrine and norepinephrine concentrations in fasted subjects compared to fed subjects.
    • Plasma catecholamines correlated with blood glucose, lactate, and glycerol but not free fatty acids.
    • Increased adrenergic activity correlated with reduced endurance time.

    Conclusions:

    • Fasting enhances the adrenergic response to submaximal exercise in sedentary men.
    • Elevated catecholamines during exercise post-fasting are associated with changes in specific energy substrates.
    • The study highlights the role of catecholamine release in energy substrate mobilization and its impact on endurance during exercise, likely in conjunction with other hormonal factors.