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Related Experiment Videos

Post-exercise ketosis

J H Koeslag, T D Noakes, A W Sloan

    The Journal of Physiology
    |April 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Exercise does not typically cause ketosis in trained athletes or sedentary individuals. However, older adults may experience post-exercise ketosis, influenced by carbohydrate intake and diet.

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    Area of Science:

    • Exercise physiology
    • Metabolic responses to exercise

    Background:

    • Understanding the metabolic effects of exercise is crucial for health and performance.
    • Ketone bodies are an alternative fuel source for the body, particularly during low carbohydrate availability.

    Purpose of the Study:

    • To investigate the impact of exercise on blood ketone body concentrations in different subject groups.
    • To explore factors influencing post-exercise ketonaemia, including age, training status, and diet.

    Main Methods:

    • Trained athletes and sedentary subjects performed bicycle ergometer exercise.
    • Blood samples were analyzed for ketone bodies, lactate, free fatty acids, glucose, growth hormone, and insulin.
    • Dietary interventions (high-carbohydrate vs. low-carbohydrate) were implemented.

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    Main Results:

    • Neither trained athletes nor sedentary subjects developed ketonaemia even after intense or prolonged exercise.
    • Older subjects exhibited post-exercise ketonaemia, peaking approximately 3 hours post-exercise.
    • A high-carbohydrate diet prevented, while a low-carbohydrate diet enhanced, post-exercise ketonaemia.

    Conclusions:

    • Exercise alone does not induce ketosis in most individuals.
    • Post-exercise ketosis in older adults is influenced by dietary carbohydrate intake.
    • Lower carbohydrate intake may contribute to post-exercise ketosis in untrained individuals compared to athletes.