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Further glycogen decrease during early recovery after eccentric exercise despite a high carbohydrate intake.

Monica Zehnder1, Mirjam Muelli, Reto Buchli

  • 1Exercise Physiology, Institute for Human Movement Sciences, Swiss Federal Institute of Technology and Institute of Physiology, University of Zurich, Zurich, Switzerland. zehnderm@access.unizh.ch

European Journal of Nutrition
|May 29, 2004
PubMed
Summary

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A carbohydrate-rich diet did not fully restore muscle glycogen after eccentric exercise in athletes experiencing delayed onset muscle soreness (DOMS). Glycogen levels continued to decrease initially, indicating potential muscle damage impacting recovery.

Area of Science:

  • Exercise Physiology
  • Sports Nutrition
  • Muscle Metabolism

Background:

  • Delayed onset muscle soreness (DOMS) is common in athletes.
  • Eccentric exercise impairs muscle glycogen resynthesis compared to concentric exercise.

Purpose of the Study:

  • To investigate if a carbohydrate-rich diet can compensate for reduced glycogen resynthesis after eccentric exercise.
  • To measure glycogen resynthesis using magnetic resonance spectroscopy.

Main Methods:

  • Muscle glycogen, phosphocreatine, ATP, and Pi were measured in athletes.
  • Two groups (DOMS and CONTROL) underwent running protocols.
  • DOMS subjects performed eccentric exercise; CONTROL subjects rested.
  • Subjects consumed a carbohydrate-rich diet (> 10 g/kg body mass/24 h).

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Main Results:

  • Glycogen reduced by approximately 50% in both groups.
  • DOMS group showed a further glycogen decrease (-15.6 mmol/kg ww) in the first 2 hours post-exercise, while the CONTROL group increased (+18.4 mmol/kg ww).
  • CONTROL subjects replenished glycogen within 24 hours; DOMS subjects required over a day.
  • Indicators of muscle injury (Pi and Pi/PCr) increased significantly in the DOMS group.

Conclusions:

  • A carbohydrate-rich diet was insufficient to fully replenish muscle glycogen stores after eccentric exercise.
  • Glycogen levels initially decreased further in the DOMS group during recovery.
  • This initial glycogen loss is likely due to muscle cell damage and repair processes.