Effect of carbohydrate intake on net muscle protein synthesis during recovery from resistance exercise

  • Børsheim E
  • Cree M
  • Tipton K
 et al. 
  • 7

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Abstract

Elisabet Børsheim, Melanie G. Cree, Kevin D. Tipton, Tabatha A. Elliott, Asle Aarsland, and Robert R. WolfeDepartment of Surgery, Metabolism Unit, Shriners Hospitals for Children-Galveston, University of Texas Medical Branch, Galveston, Texas 77550 Address for reprint requests and other correspondence: R. R. Wolfe, 815 Market St., Galveston, TX 77550 (E-mail: rwolfe{at}utmb.edu). Submitted 3 April 2003.Accepted 24 October 2003.Abstract The purpose of this study was to determine the effect of ingestion of 100 g of carbohydrates on net muscle protein balance (protein synthesis minus protein breakdown) after resistance exercise. Two groups of eight subjects performed a resistance exercise bout (10 sets of 8 repetitions of leg presses at 80% of 1-repetition maximum) before they rested in bed for 4 h. One group (CHO) received a drink consisting of 100 g of carbohydrates 1 h postexercise. The other group (Pla) received a noncaloric placebo drink. Leg amino acid metabolism was determined by infusion of 2H5- or 13C6-labeled phenylalanine, sampling from femoral artery and vein, and muscle biopsies from vastus lateralis. Drink intake did not affect arterial insulin concentration in Pla, whereas insulin increased several times after the drink in CHO (P < 0.05 vs. Pla). Arterial phenylalanine concentration fell slightly after the drink in CHO. Net muscle protein balance between synthesis and breakdown did not change in Pla, whereas it improved in CHO from -17 ± 3 nmol·ml-1·100 ml leg-1 before drink to an average of -4 ± 4 and 0 ± 3 nmol·ml-1·100 ml leg-1 during the second and third hour after the drink, respectively (P < 0.05 vs. Pla during last hour). The improved net balance in CHO was due primarily to a progressive decrease in muscle protein breakdown. We conclude that ingestion of carbohydrates improved net leg protein balance after resistance exercise. However, the effect was minor and delayed compared with the previously reported effect of ingestion of amino acids. resistance exercisemuscle protein metabolismcarbohydrate ingestionstable isotopesCopyright © 2004 the American Physiological Society

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Authors

  • Elisabet Børsheim

  • Melanie G Cree

  • Kevin D Tipton

  • Tabatha A Elliott

  • Asle Aarsland

  • Robert R Wolfe

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