Document Detail

Exogenous amino acids stimulate human muscle anabolism without interfering with the response to mixed meal ingestion.
MedLine Citation:
PMID:  15572657     Owner:  NLM     Status:  MEDLINE    
We sought to determine whether ingestion of a between-meal supplement containing 30 g of carbohydrate and 15 g of essential amino acids (CAA) altered the metabolic response to a nutritionally mixed meal in healthy, recreationally active male volunteers. A control group (CON; n = 6, 38 +/- 8 yr, 86 +/- 10 kg, 179 +/- 3 cm) received a liquid mixed meal [protein, 23.4 +/- 1.0 g (essential amino acids, 14.7 +/- 0.7 g); carbohydrate, 126.6 +/- 4.0 g; fat, 30.3 +/- 2.8 g] every 5 h (0830, 1330, 1830). The experimental group (SUP; n = 7, 36 +/- 10 yr, 87 +/- 12 kg, 180 +/- 3 cm) consumed the same meals but, in addition, were given CAA supplements (1100, 1600, 2100). Net phenylalanine balance (NB) and fractional synthetic rate (FSR) were calculated during a 16-h primed constant infusion of L-[ring-2H5]phenylalanine. Ingestion of a combination of CAA supplements and meals resulted in a greater mixed muscle FSR than ingestion of the meals alone (SUP, 0.099 +/- 0.008; CON, 0.076 +/- 0.005%/h; P < 0.05). Both groups experienced an improvement in NB after the morning (SUP, -2.2 +/- 3.3; CON, -1.5 +/- 3.5 nmol x min(-1) x 100 ml leg volume(-1)) and evening meals (SUP, -9.7 +/- 4.3; CON, -6.7 +/- 4.1 nmol x min(-1) x 100 ml leg volume(-1)). NB after CAA ingestion was significantly greater than after the meals, with values of 40.2 +/- 8.5 nmol x min(-1) x 100 ml leg volume(-1). These data indicate that CAA supplementation produces a greater anabolic effect than ingestion of intact protein but does not interfere with the normal metabolic response to a meal.
Douglas Paddon-Jones; Melinda Sheffield-Moore; Asle Aarsland; Robert R Wolfe; Arny A Ferrando
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.     Date:  2004-11-30
Journal Detail:
Title:  American journal of physiology. Endocrinology and metabolism     Volume:  288     ISSN:  0193-1849     ISO Abbreviation:  Am. J. Physiol. Endocrinol. Metab.     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-03-18     Completed Date:  2005-04-12     Revised Date:  2014-07-17    
Medline Journal Info:
Nlm Unique ID:  100901226     Medline TA:  Am J Physiol Endocrinol Metab     Country:  United States    
Other Details:
Languages:  eng     Pagination:  E761-7     Citation Subset:  IM; S    
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MeSH Terms
Amino Acids, Essential / administration & dosage*,  blood,  metabolism
Dietary Carbohydrates / administration & dosage,  metabolism
Dietary Proteins / administration & dosage*,  metabolism
Dietary Supplements*
Eating / physiology
Feeding Behavior / physiology
Middle Aged
Muscle Proteins / metabolism*
Muscle, Skeletal / drug effects*,  metabolism
Grant Support
Reg. No./Substance:
0/Amino Acids, Essential; 0/Dietary Carbohydrates; 0/Dietary Proteins; 0/Muscle Proteins
R R Wolfe / U TX Med Br, Galveston

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