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Carbohydrate supplementation during exercise.

E F Coyle1

  • 1Department of Kinesiology and Health, University of Texas, Austin.

The Journal of Nutrition
|March 1, 1992
PubMed
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During prolonged strenuous exercise, fatigue is often caused by inadequate carbohydrate oxidation, partly due to hypoglycemia. Carbohydrate feeding delays fatigue by maintaining blood glucose levels and oxidation rates.

Area of Science:

  • Exercise Physiology
  • Sports Nutrition
  • Metabolic Research

Background:

  • Skeletal muscle uses muscle glycogen and plasma glucose for energy during strenuous exercise.
  • With prolonged exercise, there's a shift from muscle glycogen to blood glucose utilization.
  • Hypoglycemia can occur during prolonged exercise, leading to muscle fatigue.

Purpose of the Study:

  • To investigate the role of carbohydrate oxidation in exercise fatigue.
  • To determine the effects of carbohydrate feeding on fuel utilization and fatigue during prolonged exercise.
  • To understand the relationship between blood glucose levels and exercise performance.

Main Methods:

  • Monitoring substrate utilization (muscle glycogen, plasma glucose) during prolonged exercise.

Related Experiment Videos

  • Assessing the impact of carbohydrate feeding on blood glucose concentration and exercise capacity.
  • Measuring maximal oxygen consumption and fatigue onset during exercise protocols.

    • Main Results:

    • Blood glucose levels decline to hypoglycemic levels during prolonged exercise, contributing to fatigue.
    • Carbohydrate feeding delays fatigue by 30-60 minutes by maintaining blood glucose and oxidation rates.
    • Muscle glycogen utilization is minimal when carbohydrate is consumed during exercise, indicating blood glucose as the primary source.

    Conclusions:

    • Inadequate carbohydrate oxidation, often due to hypoglycemia, is a primary cause of fatigue during prolonged strenuous exercise.
    • Carbohydrate supplementation during exercise helps delay fatigue but does not prevent it.
    • There is a limit to the rate at which blood glucose can be utilized for energy, even with supplementation.