Publication: Variations in fibre composition of the gastrocnemius muscle in rats subjected to speed training
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Date
1990
Authors
Morales-López, J. L. ; Agüera, E. ; Miró, F. ; Diz, A.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
Thirty-six adult Wistar rats were divided into
three groups. One group was used as a control, and the
other two underwent different training programmes in
which greater relevance was attached to the intensity of
exercise than to its duration. Samples of the red and
mixed portions of m. gastrocnemius (caputlateralis) were
stained with m-ATPase to determine the percentage of
type 1, IIA and IIB fibres, and with NADH-TR in order
to quantify variations in the percentage of low staining
intensity (FG) fibres.
The most notable results obtained were: a) the ratio of
type 1 type 11 fibres remained unchanged; b) the
proportion of IIA fibres increased, while that of IIB
fibres decreased correspondingly; c) FG fibres, which
were virtually absent from the red portion, recorded a
clear decrease which was more marked, and occurred
more rapidly, than in IIB fibres. These differences were
al1 statistically significant in the mixed portion of the
muscle. Adaptative changes in fibre composition in the
red portion were less marked.
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