Publication: Influence of age on fibre type characteristics in the middle gluteal muscle of Andalusian foals
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Date
1992
Authors
Martínez Galisteo, A. ; Diz, A. ; Agüera, E. ; Vivo, J.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
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.
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