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dc.contributor.authorOkoshi, Marina Politi-
dc.contributor.authorPadovani, Carlos Roberto-
dc.contributor.authorNardi, S. C.-
dc.contributor.authorCicogna, Antonio Carlos-
dc.identifier.citationJapanese Heart Journal, v. 35, n. 3, p. 333-343, 1994.-
dc.description.abstractIsolated papillary muscles have often been used in myocardial mechanical function studies. The objective of the present study was to compare the mechanical function of papillary muscle isolated from left ventricle between Wistar (W) and Wistar-Kyoto (WKY) rats of different ages (1, 3, 6 and 12 months), in order to examine whether there is a difference in intrinsic mechanical properties of muscle between the two rat strains. Muscles were perfused with Krebs-Henseleit solution at 28°C and studied isometrically and isotonically at a stimulation rate of 0.2 Hz. The W and WKY showed statistically significant differences during both isometric and isotonic contractions. During isometric contraction? (l) the peak developed tension (DT) and + dT/dt were lower in WKY rats in the 1 mo groups, (2) the resting tension (RT) was greater in WKY at 3, 6 and 12 mo. (3) time to peak tension (TPT) was greater in WKY at 3 and 12 mo, (4) time for tension to fall from peak to 50% of peak tension (RT 1/2) was greater in WKY at 3 mo and (5) - dT/dt was lower in WKY at 1 and 3 mo. During isotonic contraction, (1) the peak shortening (PS) and -dL/dt were lower in WKY at 12 mo, (2) the time to peak shortening (TPS) was greater in WKY at 3 and 12 mo; (3) + dL/dt was lower in WKY at 3, 6, and 12 mo and (4) the relative variation of length (Lmax-PS)/Lmax was greater in WKY at 6 and 12 mo. These data showed a difference in mechanical behaviour of the papillary muscle between Wistar and Wistar-Kyoto rats of different age.en
dc.subjectCardiac muscle function-
dc.subjectIsolated papillary muscles-
dc.subjectWistar rats-
dc.subjectWistar-Kyoto rats-
dc.subjectanimal experiment-
dc.subjectanimal tissue-
dc.subjectcomparative study-
dc.subjectheart function-
dc.subjectheart left ventricle-
dc.subjectheart papillary muscle-
dc.subjectmuscle isometric contraction-
dc.subjectmuscle isotonic contraction-
dc.subjectmuscle tone-
dc.subjectpriority journal-
dc.subjectComparative Study-
dc.subjectIn Vitro-
dc.subjectIsometric Contraction-
dc.subjectMyocardial Contraction-
dc.subjectOrgan Weight-
dc.subjectPapillary Muscles-
dc.subjectRats, Inbred WKY-
dc.subjectRats, Wistar-
dc.subjectSupport, Non-U.S. Gov't-
dc.titleComparative mechanical study of isolated papillary muscle from Wistar-Kyoto and Wistar ratsen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationDepartamento de Clinica Medica Faculdade de Medicina de Botucatu, Sao Paulo 18618-000-
dc.description.affiliationUnespDepartamento de Clinica Medica Faculdade de Medicina de Botucatu, Sao Paulo 18618-000-
dc.rights.accessRightsAcesso aberto-
dc.relation.ispartofJapanese Heart Journal-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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