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Título: Degree of correspondence between contractile and oxidative capacities in horse muscle fibre, a histochemical study
Fecha de publicación: 1990
Editorial: Murcia : F. Hernández
ISSN: 0213-3911
Materias relacionadas: CDU::6 - Ciencias aplicadas::61 - Medicina
Palabras clave: Muscle fibre types
Resumen: Samples taken from the middle gluteal muscle of 95 untrained adult horses of different ages and sex were subjected to histochemical analysis using the myosin adenosine triphosphatase (m-ATPase) and nicotinamide adenine dinucleotide tetrazolium reductase (NADH-TR) staining techniques. Fibres were classified into types 1, IIA and IIB according to m-ATPase activity after preincubation at pH 4.4. The percentage of FT (Fast-Twitch Glycolytic) fibres and the proportion of IIB fibres with «high» and «low» oxidative capacity were determined in serial sections stained for NADH-TR. Statistical analysis revealed a significantly higher proportion of IIR fibres than FT fibres (P < 0.001), though both percentages were correlated. Thus, 72.2 +/- 17.6% of type IIB fibres showed low oxidative capacity , but the remaining 27.8 +/- 17.6% showed high aerobic potential, and thus did not correspond to FT fibres. These results confirm that the contractile capacity of a muscle fibre does not determine its oxidative profile. The different types of muscle fibre should thus be classified solely according to m-ATPase activity, since this characteristic is related to the molecular structure of contractile proteins. Oxidative capacity should be assessed separately, and not be used as a criterion for fibre classification in horses.
Autor/es principal/es: López-Rivero, J.L.
Agüera, E.
Rodríguez Barbudo, M. V.
Galisteo, A. M.
Morales-López, J. L.
Publicado en: Histology and histopathology
URI: http://hdl.handle.net/10201/18145
Tipo de documento: info:eu-repo/semantics/article
Número páginas / Extensión: 5
Derechos: info:eu-repo/semantics/openAccess
Aparece en las colecciones:Vol. 5, nº 1 (1990)

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