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Metabolic adaptations in post-exercise recovery.

G Krzentowski, F Pirnay, A S Luyckx

    Clinical Physiology (Oxford, England)
    |August 1, 1982
    PubMed
    Summary

    Ingesting carbohydrates after prolonged exercise leads to altered hormonal responses, including higher glucagon and delayed insulin. This impacts glucose metabolism, favoring lipid oxidation and muscle glycogen replenishment.

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    Area of Science:

    • Endocrinology
    • Exercise Physiology
    • Metabolic Adaptations

    Background:

    • Carbohydrate ingestion post-exercise is crucial for recovery.
    • Hormonal and metabolic responses to glucose loading after exercise are not fully understood.

    Purpose of the Study:

    • To investigate hormonal and metabolic adaptations to carbohydrate ingestion following prolonged exercise.
    • To compare glucose metabolism after rest versus post-exercise.

    Main Methods:

    • Administered a 100-g oral glucose load (13C-glucose) to healthy volunteers.
    • Compared responses after rest (control) versus after 3-hour treadmill exercise.
    • Utilized indirect calorimetry and measured plasma glucose, insulin, glucagon, and free fatty acids (FFA).

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    Main Results:

    • Post-exercise oral glucose tolerance test showed higher blood glucose and delayed insulin response.
    • Elevated plasma glucagon and initial high FFA levels were observed post-exercise.
    • Reduced carbohydrate oxidation and increased lipid oxidation occurred post-exercise.
    • Exogenous glucose oxidation was significantly lower after exercise (21.1g vs 35.9g).

    Conclusions:

    • Higher glucagon and delayed insulin post-exercise may reduce hepatic glucose retention.
    • Increased lipid oxidation post-exercise could drive decreased carbohydrate oxidation and promote muscle glycogen repletion via the Randle cycle.
    • Further studies are needed to explain sustained lipid oxidation post-exercise.