Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/7599
Appears in Collections:Faculty of Health Sciences and Sport Journal Articles
Peer Review Status: Refereed
Title: An abundant supply of amino acids enhances the metabolic effect of exercise on muscle protein
Authors: Biolo, Gianni
Tipton, Kevin
Klein, Samuel
Wolfe, Robert R
Contact Email: k.d.tipton@stir.ac.uk
Keywords: stable isotopes
blood flow
phenylalanine
leucine
lysine
alanine
Issue Date: Jul-1997
Publisher: the American Physiological Society
Citation: Biolo G, Tipton K, Klein S & Wolfe RR (1997) An abundant supply of amino acids enhances the metabolic effect of exercise on muscle protein, American Journal of Physiology - Endocrinology and Metabolism, 273 (1), pp. E122-E129.
Abstract: An abundant supply of amino acids enhances the metabolic effect of exercise on muscle protein. Am. J. Physiol. 273 (Endocrinol. Metab. 36): El22-E129, 1997. -Six normal untrained men were studied during the intravenous infusion of a balanced amino acid mixture (-0.15 g. kg-l. h-l for 3 h) at rest and after a leg resistance exercise routine to test the influence of exercise on the regulation of muscle protein kinetics by hyperaminoacidemia. Leg muscle protein kinetics and transport of selected amino acids (alanine, phenylalanine, leucine, and lysine) were isotopically determined using a model based on arteriovenous blood samples and muscle biopsy. The intravenous amino acid infusion resulted in comparable increases in arterial amino acid concentrations at rest and after exercise, whereas leg blood flow was 64 +/- 5% greater after exercise than at rest. During hyperaminoacidemia, the increases in amino acid transport above basal were 30-100% greater after exercise than at rest. Increases in muscle protein synthesis were also greater after exercise than at rest (291 +/- 42% vs. 141 +/- 45%). Muscle protein breakdown was not significantly affected by hyperaminoacidemia either at rest or after exercise. We conclude that the stimulatory effect of exogenous amino acids on muscle protein synthesis is enhanced by prior exercise, perhaps in part because of enhanced blood flow. Our results imply that protein intake immediately after exercise may be more anabolic than when ingested at some later time.
Type: Journal Article
URI: http://hdl.handle.net/1893/7599
URL: http://ajpendo.physiology.org/content/273/1/E122.full.pdf
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: University of Texas Medical Branch
Sport
University of Texas Medical Branch
University of Texas

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