Document Detail

Beta-adrenergic blockade heightens the exercise-induced increase in leucine oxidation.
MedLine Citation:
PMID:  7762645     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to assess the interaction between beta-blockade and exercise on amino acid kinetics. This was a three-way crossover experiment using beta 1-blockade, beta 1,beta 2-blockade, and a placebo control. Three 6-h L-[1-13C]leucine and L-[alpha-15N]lysine infusions were performed. The first 3 h established an isotopic steady state, and 1 h of exercise (approximately 50% of maximal O2 consumption) and 2 h of recovery followed. Plasma glucose decreased with exercise during all trials (P < 0.0001). During beta 1- and beta 1,beta 2-blockade, plasma free fatty acids were reduced during rest and exercise (P < 0.001). Leucine and lysine rates of appearance were unaffected by beta-blockade during rest but were decreased with placebo exercise. Leucine oxidation increased with beta-blockade (P < 0.01) and exercise (P < 0.001). There was a statistical interaction between both treatments (P < 0.004). In conclusion, leucine oxidation increased with exercise, further increased with beta 1-blockade, and was additionally heightened with beta 1,beta 2-blockade. This cumulative response indicates that leucine oxidation was regulated through beta 1- and beta 2-receptors.
L S Lamont; A J McCullough; S C Kalhan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  268     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1995 May 
Date Detail:
Created Date:  1995-06-29     Completed Date:  1995-06-29     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  E910-16     Citation Subset:  IM    
Exercise Science Program, University of Rhode Island, Kingston, Rhode Island 02881, USA.
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MeSH Terms
Adrenergic beta-Antagonists / pharmacology*
Blood Glucose / analysis
Fatty Acids, Nonesterified / blood
Leucine / metabolism*
Lysine / metabolism
Oxidation-Reduction / drug effects
Physical Exertion*
Proteins / metabolism
Grant Support
Reg. No./Substance:
0/Adrenergic beta-Antagonists; 0/Blood Glucose; 0/Fatty Acids, Nonesterified; 0/Proteins; 56-87-1/Lysine; 61-90-5/Leucine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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