Document Detail

Isometric training of young rats--effects upon hind limb muscles. Histochemical, morphometric, and electron microscopic studies.
MedLine Citation:
PMID:  126115     Owner:  NLM     Status:  MEDLINE    
The soleus, rectus femoris, and gastrocnemius muscles of young rats trained isometrically for 4 weeks were studied by light and electron microscopy.--The percentage of fast-twitch oxidative muscle fibers decreased at the cost of the fast-twitch glycolytic fibers in the rectus femoris muscle. The percentages of the slow-twitch oxidative fibers did not change significantly in any of the muscles studied. The changes in the areas of the muscle fibers were specific for the muscle and the fiber type and indicate geometrical rearrangements of the fibers in the trained muscles. The Z and M lines were broader in the soleus (containing about 85% slow-twitch oxidative fibers) than in the rectus femoris muscle (containing about 90% fast-twitch glycolytic fibers), while the sarcomere length and the pseudo-H zone were similar. The length of the myosin filaments appeared to be slightly shorter in the fast rectus femoris than in the slow soleus muscle.--The hypothesis on the temporal progress of muscle adaptation to training (Müller, 1974) was substantiated. Correlations between biochemical (Exner et al., 1973a) and histochemical parameters measuring the oxidative capacity were preserved during adaptation to training. The comparison of the histochemical results with the physiological data on similar animals (Exner et al., 1973a) suggests a complex relationship between the contraction time and the percentage of fast-twitch muscle fibers.
W Müller
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Cell and tissue research     Volume:  161     ISSN:  0302-766X     ISO Abbreviation:  Cell Tissue Res.     Publication Date:  1975 Aug 
Date Detail:
Created Date:  1975-12-30     Completed Date:  1975-12-30     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0417625     Medline TA:  Cell Tissue Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  225-37     Citation Subset:  IM; S    
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MeSH Terms
Adaptation, Physiological
Adenosine Triphosphatases / analysis
Body Weight
Mitochondria, Muscle / ultrastructure
Muscle Contraction
Muscles / metabolism,  ultrastructure*
Myofibrils / enzymology
Organ Size
Physical Conditioning, Animal*
Rats, Inbred Strains
Succinate Dehydrogenase / analysis
Reg. No./Substance:
EC Dehydrogenase; EC 3.6.1.-/Adenosine Triphosphatases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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