Impaired muscle glycogen resynthesis after eccentric exercise

Costill, D.L., Pascoe, D.D., Fink, W.J., Robergs, R.A., Barr, S.I., & Pearson, D. (1990) Impaired muscle glycogen resynthesis after eccentric exercise. Journal of Applied Physiology, 69(1), pp. 46-50.

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Abstract

Eight men performed 10 sets of 10 eccentric contractions of the knee extensor muscles with one leg [eccentrically exercised leg (EL)]. The weight used for this exercise was 120% of the maximal extension strength. After 30 min of rest the subjects performed two-legged cycling [concentrically exercised leg (CL)] at 74% of maximal O2 uptake for 1 h. In the 3 days after this exercise four subjects consumed diets containing 4.25 g CHO/kg body wt, and the remainder were fed 8.5 g CHO/kg. All subjects experienced severe muscle sorenes and edema in the quadriceps muscles of the eccentrically exercised leg. Mean (± SE) resting serum creatine kinase increased from a preexercise level of 57 ± 3 to 6,988 ± 1,913 U/l on the 3rd day of recovery. The glycogen content (mmol/kg dry wt) in the vastus lateralis of CL muscles averaged 90, 395, and 592 mmol/kg dry wt at 0, 24, and 72 h of recovery. The EL muscle, on the other hand, averaged 168, 329, and 435 mmol/kg dry wt at these same intervals. Subjects receiving 8.5 g CHO/kg stored significantly more glycogen than those who were fed 4.3 g CHO/kg. In both groups, however, significantly less glycogen was stored in the EL than in the CL.

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ID Code: 96961
Item Type: Journal Article
Refereed: Yes
Keywords: glycogen, article; carbohydrate diet; exercise; histology; human cell; human experiment; male; muscle metabolism; normal human; priority journal, Adult; Dietary Carbohydrates; Exercise; Glycogen; Human; Male; Muscle Contraction; Muscles; Support, Non-U.S. Gov't; Time Factors
ISSN: 8750-7587
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Schools > School of Exercise & Nutrition Sciences
Deposited On: 18 Jul 2016 23:50
Last Modified: 18 Jul 2016 23:50

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