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Muscle damage: nutritional considerations.

W J Evans1

  • 1USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111.

International Journal of Sport Nutrition
|September 1, 1991
PubMed
Summary

Unaccustomed or eccentric exercise causes significant muscle damage, leading to delayed soreness and weakness. Adequate recovery time is crucial for muscle repair and glycogen replenishment after strenuous workouts.

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Area of Science:

  • Exercise Physiology
  • Muscle Biology
  • Sports Science

Background:

  • Exercise, particularly unaccustomed or eccentric, induces skeletal muscle damage.
  • This damage triggers a metabolic cascade impacting muscle function and recovery.

Purpose of the Study:

  • To elucidate the metabolic events following exercise-induced muscle damage.
  • To understand the implications for athletes and coaches regarding recovery and nutrition.

Main Methods:

  • The abstract describes the physiological and metabolic responses to exercise-induced muscle damage.
  • It focuses on the temporal changes in muscle soreness, weakness, inflammatory markers, protein degradation, and glycogen stores.

Main Results:

  • Delayed onset muscle soreness and weakness peak within 24-48 hours post-exercise.
  • Elevated neutrophils and interleukin-1, prolonged muscle damage, and protein degradation are observed.
  • Muscle glycogen stores are depleted, indicating a potential increase in dietary protein needs.

Conclusions:

  • Significant muscle damage from exercise necessitates adequate recovery periods between competitions.
  • Athletes and coaches should consider the prolonged repair and repletion phases, especially after high-eccentric exercise.
  • Nutritional strategies, particularly protein intake, may need adjustment during initial training phases.

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