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Related Experiment Videos

Training decreases muscle glycogen turnover during exercise

J L Azevedo1, J K Linderman, S L Lehman

  • 1Department of Integrated Biology, University of California, Berkeley 94720-3140, USA.

European Journal of Applied Physiology and Occupational Physiology
|December 5, 1998
PubMed
Summary

Endurance training significantly reduces muscle glycogen degradation during exercise. This study found that trained rats had tenfold lower muscle glycogen degradation rates compared to untrained rats, preserving muscle glycogen stores.

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Area of Science:

  • Exercise Physiology
  • Metabolic Biochemistry

Background:

  • Glycogen kinetics, the balance between synthesis and degradation, is crucial for sustained exercise performance.
  • Endurance training is known to alter substrate metabolism during physical activity.

Purpose of the Study:

  • To investigate the impact of endurance training on glycogen synthesis and degradation rates during exercise.
  • To quantify glycogen kinetics using a novel model in trained versus untrained rats.

Main Methods:

  • Rats (trained and untrained) underwent rest and exercise periods with infusions of 3H-glucose and 14C-lactate.
  • Blood samples and tissue biopsies (muscle, liver, heart) were collected for glycogen concentration and isotope analysis.
  • A mathematical model was employed to determine glycogen synthesis and degradation rates.

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Main Results:

  • Muscle glycogen concentration decreased significantly in untrained rats but remained stable in trained rats post-exercise.
  • Liver glycogen decreased in both groups, with a greater reduction in untrained rats.
  • While muscle glycogen synthesis rates were similar, training led to a tenfold decrease in muscle glycogen degradation rates.

Conclusions:

  • Endurance training significantly reduces muscle glycogen degradation during exercise.
  • This adaptation in glycogen kinetics likely contributes to improved exercise capacity in trained individuals.