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In-vitro stimulation on the rat epitrochlearis muscle. II. Effects of catecholamines and nutrients on protein degradation and amino acid metabolism.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences.
1989 (English)In: Acta Physiologica Scandinavica, ISSN 0001-6772, E-ISSN 1365-201X, Vol. 135, no 4, 523-9 p.Article in journal (Refereed) Published
Abstract [en]

The influence of catecholamines and branched-chain amino acids (BCAA) plus insulin on protein degradation and amino acid metabolism was investigated in isolated and electrically stimulated rat epitrochlearis muscles. 10(-7) M adrenaline significantly increased the total amount of muscle tyrosine during 40 min of stimulation with 50 Hz (I s min 1) pulse trains. On the other hand, BCAA + insulin at normal and five times normal plasma concentrations had no effect on muscle tyrosine. Muscle 3- methylhistidine was not influenced by any of the treatments. Muscle release and content of aspartate, alanine, glutamate and glutamine showed individual response characteristics to catecholamines and BCAA + insulin. The data indicate that adrenaline can induce an increased total protein degradation in rat fast muscle during acute contractions in vitro and, furthermore, that BCAA + insulin does not retard protein breakdown during acute muscle contraction.

Place, publisher, year, edition, pages
1989. Vol. 135, no 4, 523-9 p.
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Medical and Health Sciences
Identifiers
URN: urn:nbn:se:gih:diva-1008DOI: 10.1111/j.1748-1716.1989.tb08611.xPubMedID: 2660488OAI: oai:DiVA.org:gih-1008DiVA: diva2:240381
Available from: 2009-09-28 Created: 2009-09-28 Last updated: 2011-05-12Bibliographically approved

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