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PMID: 2044528 Published · ppublish English Comparative Study Journal Article

The relationship of voluntary running to fibre type composition, fibre area and capillary supply in rat soleus and plantaris muscles.

European journal of applied physiology and occupational physiology ·Vol. 62 ·No. 3 ·1991-00-00 ·Pages 211-5

Ishihara A, Inoue N, Katsuta S

Abstract

Twenty 4-week-old Wistar rats exercised voluntarily in running wheels each day for 45 days. Fibre type composition, fibre cross-sectional area and the number of capillaries around a fibre of the slow-twitch soleus and fast-twitch plantaris muscles were examined and compared with animals which had no access to running wheels. The exercise group had a higher percentage of fast-twitch oxidative glycolytic (FOG) fibres and a lower percentage of fast-twitch glycolytic (FG) fibres in the deep portion of the plantaris muscle. The area of FOG fibres in the surface portion of the plantaris muscle was also greater in the exercise group. In the exercised animals, there was a positive relationship between the running distance and the area of FOG fibres in both the deep and surface portions of the plantaris muscle. In addition, the running distance correlated positively with the percentage of FOG fibres and negatively with that of FG fibres in the deep portion of the plantaris muscle. There were no relationships between the running distance and fibre type composition, or fibre area and capillary supply in the soleus muscle. These results suggested that the increase in the percentage and area of FOG fibres in the fast-twitch muscle was closely related to voluntary running.

MeSH Terms
Animals Body Weight Capillaries/anatomy & histology Hindlimb Male Muscles/anatomy & histology,blood supply,physiology Organ Size Rats Running Volition
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Ishihara A
College of Liberal Arts and Sciences, Kyoto University, Japan.
Inoue N
Katsuta S
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Article Info
Journal
European journal of applied physiology and occupational physiology
Abbr.
Eur J Appl Physiol Occup Physiol
ISSN
0301-5548
DOI
10.1007/BF00643744
Published
1991-00-00
Pages
211-5
Language
English
Region
Germany
NLM ID
0410266
Subset
IM
External Links
PubMed source DOI: 10.1007/BF00643744
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