Browsing by Subject "Muscle fibres"

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    Histochemical and morphometric study of the cricoarytenoideus lateralis muscle in the horse
    (Murcia : F. Hernández, 1994) López-Plana, C.; Sautet, J.Y.; Ruberte, J.; Sabaté, D.
    Histochemical and morphometric parameters of the cricoarytenoideus lateralis muscle of the horse are presented. Using myosin ATPase staining after acid preincubation, 3 fibre types (1, IIA and IIC) were identified. Using NADH-TR staining, type 1 fibres showed high oxidative capacity, whereas type 11 fibres had high or low oxidative capacity. The type 1 to type 11 ratio was of 35:65. This ratio remained constant in the age range examined. Statistically significant (p<0.01) differences were found in values for fibre size between groups of horses weighing more than 500 kg and less than 400 kg. Mean area of type 11 fibres was greater (p<0.001) than that of type 1 fibres. There were no significant differences in mean area between left and right muscles in the group of animals with less weight. In contrast, significant differences (p<0.05) in mean area between left and right muscles were found for type 1 fibres in the group of animals exhibiting a higher weight. The histographical distribution of fibre type areas was unimodal. Most adult horses showed muscle fibre type grouping in the left muscle
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    Influence of age on fibre type characteristics in the middle gluteal muscle of Andalusian foals
    (Murcia : F. Hernández, 1992) Martínez Galisteo, A.; Diz, A.; Agüera, E.; Vivo, J.
    34 Andalusian foals of both sexes were divided into three age-groups (A = mean age 1 month, B = 7 months, C = 14 months). Samples of the right m. gluteus medius were stained for m-ATPase and NADH-TR in order to determine fibre type composition and size as well as the relative area occupied by each type. Results revealed no statistically significant variation in the proportion of type 1 fibre among the three age-groups. Significant differences were recorded, however, for type 11 fibres; an increase in the proportion of IIA fibres was accompanied by a decrease in IIB ones, the difference being most marked between groups A and B. IIB high-oxidative fibres also decreased, while IIB low-oxidative ones showed no significant variation. Al1 fibre types increased significantly in size; types 1 and IIA recorded a threefold increase, whereas type IIB showed least growth. The relative area occupied by each type increased significantly between groups A and B, but only IIA fibres recorded a significant increase in relative area between groups B and C.