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Related Experiment Videos

Overtraining and glycogen depletion hypothesis

A C Snyder1

  • 1Department of Human Kinetics, University of Wisconsin-Milwaukee 53201, USA. acs@uwm.edu

Medicine and Science in Sports and Exercise
|July 15, 1998
PubMed
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Low muscle glycogen from extensive exercise causes fatigue. However, maintaining glycogen with carbohydrates did not prevent overtraining in cyclists, suggesting other factors contribute to overtraining syndrome.

Area of Science:

  • Sports Science
  • Exercise Physiology
  • Nutritional Biochemistry

Background:

  • Extensive exercise can deplete muscle glycogen stores, leading to fatigue and performance decline.
  • Low muscle glycogen may also contribute to peripheral and central fatigue through branched-chain amino acid oxidation.
  • The role of muscle glycogen in the development of overtraining syndrome remains unclear.

Purpose of the Study:

  • To investigate if low muscle glycogen contributes to overtraining.
  • To determine if sufficient carbohydrate intake can prevent overtraining.
  • To explore potential mechanisms of overtraining beyond glycogen depletion.

Main Methods:

  • Review of existing research on swimmers and cyclists.
  • Analysis of studies examining training load, energy intake, carbohydrate consumption, and muscle glycogen levels.

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  • Comparison of physiological responses to training in different athlete populations.

    • Main Results:

    • Swimmers with training non-responsiveness exhibited low muscle glycogen and insufficient energy/carbohydrate intake.
    • Cyclists who maintained muscle glycogen through increased carbohydrate intake still met over-reaching criteria.
    • These findings suggest that reduced muscle glycogen alone does not fully explain overtraining.

    Conclusions:

    • While low muscle glycogen contributes to fatigue, it may not be the sole or primary cause of overtraining syndrome.
    • Other physiological or psychological mechanisms likely play a significant role in the development of overtraining.
    • Further research is needed to elucidate the multifactorial nature of overtraining.