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Related Experiment Videos

Impaired muscle glycogen resynthesis after eccentric exercise.

D L Costill1, D D Pascoe, W J Fink

  • 1Human Performance Laboratory, Ball State University, Muncie, Indiana 47306.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 1, 1990
PubMed
Summary

Eccentric exercise causes significant muscle damage and delayed glycogen replenishment compared to concentric exercise. Higher carbohydrate intake aids recovery, but eccentric exercise impairs overall muscle glycogen storage.

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Area of Science:

  • Exercise Physiology
  • Muscle Metabolism
  • Sports Nutrition

Background:

  • Eccentric muscle contractions are known to induce greater muscle damage than concentric contractions.
  • Understanding the impact of exercise type on muscle recovery and glycogen resynthesis is crucial for athletes and clinicians.

Purpose of the Study:

  • To investigate the effects of eccentric exercise on muscle damage and glycogen storage.
  • To compare glycogen replenishment rates between eccentrically and concentrically exercised muscles.
  • To assess the role of carbohydrate intake in recovery from eccentric exercise.

Main Methods:

  • Eight men performed 10 sets of 10 eccentric knee extensor contractions (120% maximal strength) with one leg (EL) followed by 1-hour cycling (CL).
  • Muscle soreness, edema, and serum creatine kinase levels were monitored.

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  • Vastus lateralis muscle glycogen content was measured at 0, 24, and 72 hours post-exercise.
  • Subjects consumed either 4.25 g or 8.5 g CHO/kg body weight daily during recovery.

    • Main Results:

    • Severe muscle soreness and edema were reported in the EL.
    • Serum creatine kinase levels significantly increased, peaking on day 3.
    • Glycogen content in the EL was significantly lower than in the CL at all recovery time points.
    • Higher carbohydrate intake (8.5 g CHO/kg) resulted in greater glycogen storage compared to lower intake (4.25 g CHO/kg).

    Conclusions:

    • Eccentric exercise leads to substantial muscle damage and impaired glycogen resynthesis compared to concentric exercise.
    • Adequate carbohydrate availability is essential for muscle glycogen recovery, though it does not fully overcome the deficit caused by eccentric exercise.
    • These findings highlight the importance of tailored recovery strategies following intense eccentric loading.