Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/7570

Appears in Collections:School of Sport Journal Articles
Peer Review Status: Refereed
Title: Ingestion of casein and whey proteins result in muscle anabolism after resistance exercise
Authors: Tipton, Kevin
Elliott, Tabatha A
Cree, Melanie G
Wolf, Steven E
Sanford, Arthur P
Wolfe, Robert R
Contact Email: k.d.tipton@stir.ac.uk
Keywords: muscle protein synthesis
arteriovenous balance
net muscle protein balance
muscle biopsies
Issue Date: Dec-2004
Publisher: American College of Sports Medicine
Citation: Tipton K, Elliott TA, Cree MG, Wolf SE, Sanford AP & Wolfe RR (2004) Ingestion of casein and whey proteins result in muscle anabolism after resistance exercise, Medicine and Science in Sports and Exercise, 36 (12), pp. 2073-2081.
Abstract: PURPOSE: Determination of the anabolic response to exercise and nutrition is important for individuals who may benefit from increased muscle mass. Intake of free amino acids after resistance exercise stimulates net muscle protein synthesis. The response of muscle protein balance to intact protein ingestion after exercise has not been studied. This study was designed to examine the acute response of muscle protein balance to ingestion of two different intact proteins after resistance exercise. METHODS: Healthy volunteers were randomly assigned to one of three groups. Each group consumed one of three drinks: placebo (PL; N = 7), 20 g of casein (CS; N = 7), or whey proteins (WH; N = 9). Volunteers consumed the drink 1 h after the conclusion of a leg extension exercise bout. Leucine and phenylalanine concentrations were measured in femoral arteriovenous samples to determine balance across the leg. RESULTS: Arterial amino acid concentrations were elevated by protein ingestion, but the pattern of appearance was different for CS and WH. Net amino acid balance switched from negative to positive after ingestion of both proteins. Peak leucine net balance over time was greater for WH (347 +/- 50 nmol.min(-1).100 mL(-1) leg) than CS (133 +/- 45 nmol.min(-1).100 mL(-1) leg), but peak phenylalanine balance was similar for CS and WH. Ingestion of both CS and WH stimulated a significantly larger net phenylalanine uptake after resistance exercise, compared with the PL (PL -5 +/- 15 mg, CS 84 +/- 10 mg, WH 62 +/- 18 mg). Amino acid uptake relative to amount ingested was similar for both CS and WH (approximately 10-15%). CONCLUSIONS: Acute ingestion of both WH and CS after exercise resulted in similar increases in muscle protein net balance, resulting in net muscle protein synthesis despite different patterns of blood amino acid responses.
Type: Journal Article
URI: http://hdl.handle.net/1893/7570
URL: http://journals.lww.com/acsm-msse/Abstract/2004/12000/Ingestion_of_Casein_and_Whey_Proteins_Result_in.12.aspx
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: Sport - Academic
University of Texas Medical Branch
University of Texas Medical Branch
University of Texas Medical Branch
University of Texas Medical Branch
University of Texas

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