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Related Experiment Videos

Exogenous carbohydrate utilisation: effects on metabolism and exercise performance

M S el-Sayed1, D MacLaren, A J Rattu

  • 1Centre for Sport and Exercise Sciences, Liverpool John Moores University, School of Human Sciences, U.K.

Comparative Biochemistry and Physiology. Part A, Physiology
|December 24, 1997
PubMed
Summary

Maintaining adequate carbohydrate availability is crucial for preventing fatigue during prolonged exercise. Supplementing with carbohydrates, particularly moderately concentrated solutions, can enhance endurance performance and optimize energy delivery.

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Area of Science:

  • Exercise Physiology
  • Sports Nutrition
  • Human Metabolism

Background:

  • Decreased carbohydrate availability during prolonged exercise leads to fatigue in humans.
  • Carbohydrate ingestion before or during exercise can delay fatigue, spare muscle glycogen, and improve performance.
  • Carbohydrates are categorized by their glycaemic index and insulinemic response, influencing blood glucose levels.

Purpose of the Study:

  • To review the role of carbohydrate availability in exercise performance.
  • To examine the impact of different carbohydrate types and ingestion strategies on energy delivery and utilization during exercise.
  • To discuss the hormonal regulation of carbohydrate metabolism during physical activity.

Main Methods:

  • Review of existing literature on carbohydrate metabolism and exercise performance.

Related Experiment Videos

  • Analysis of factors influencing exogenous carbohydrate oxidation rates during exercise.
  • Examination of the effects of carbohydrate ingestion on hormonal responses and performance outcomes.

    • Main Results:

    • Peak exogenous carbohydrate oxidation rates during exercise range from 0.4 to 1.0 g/min.
    • Ingestion of moderately concentrated carbohydrate solutions (4-8%) optimizes energy and fluid delivery without adverse effects.
    • Fructose ingestion during exercise does not appear to offer additional benefits over glucose or glucose polymer solutions.

    Conclusions:

    • Carbohydrate ingestion, particularly moderately concentrated solutions, is effective in enhancing prolonged exercise performance.
    • Hormones like insulin, glucagon, adrenaline, cortisol, and growth hormone are critical in regulating carbohydrate metabolism during exercise.
    • While beneficial for prolonged exercise, the ergogenic effects of carbohydrate ingestion on intermittent exercise performance are less established.