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Related Experiment Videos

Carbohydrate feeding during prolonged strenuous exercise can delay fatigue.

E F Coyle, J M Hagberg, B F Hurley

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |July 1, 1983
    PubMed
    Summary

    Carbohydrate feeding during exercise can delay fatigue in cyclists by maintaining blood glucose levels. This nutritional strategy improved endurance performance, extending exercise duration significantly.

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    Area of Science:

    • Sports Science
    • Exercise Physiology
    • Nutritional Biochemistry

    Background:

    • Exercise performance is limited by fatigue.
    • Carbohydrate availability is crucial for sustained energy during prolonged physical activity.
    • Understanding the role of exogenous carbohydrates in delaying fatigue is essential for athletes.

    Purpose of the Study:

    • To investigate if carbohydrate ingestion during exercise can postpone the onset of fatigue in trained cyclists.
    • To examine the physiological effects of carbohydrate feeding on blood glucose and insulin levels during endurance exercise.

    Main Methods:

    • Ten trained cyclists completed two ergometer tests separated by one week.
    • Subjects received either a glucose polymer solution or a placebo during exercise.

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  • Fatigue was defined as a 10% decrease in exercise intensity from the initial work rate.
  • Blood glucose, insulin, and respiratory exchange ratio were monitored.

    • Main Results:

    • Carbohydrate feeding resulted in 20-40% higher blood glucose concentrations compared to placebo.
    • The exercise-induced drop in plasma insulin was blunted by carbohydrate ingestion.
    • Fatigue was delayed in 7 out of 10 cyclists, with an average increase in exercise time from 134 to 157 minutes (P < 0.01).
    • Hypoglycemia prevention was the primary mechanism in only two subjects.

    Conclusions:

    • Carbohydrate ingestion during prolonged exercise effectively delays fatigue in trained cyclists.
    • The ergogenic effect is primarily mediated by maintaining higher blood glucose levels, not solely by preventing hypoglycemia.
    • Nutritional strategies involving carbohydrate intake can enhance endurance performance.