Document Detail

Recruitment pattern of muscle fibre type during flat and sloped treadmill running in thoroughbred horses.
MedLine Citation:
PMID:  17402446     Owner:  NLM     Status:  MEDLINE    
REASONS FOR PERFORMING THE STUDY: There is little information about the muscle fibre recruitment pattern during sloped and flat track running in Thoroughbred horses. OBJECTIVES: To examine the glycogen depletion pattern of each muscle fibre type during running on a flat and sloped treadmill. METHODS: Thirteen Thoroughbred horses (3-9 years old) were used. They were initially subjected to incremental exercise tests on a treadmill at 10 and 0% inclines in each horse to determine running speed at 90 and 60% VO2max. Needle biopsy samples were obtained from the middle gluteal muscle immediately after the running at 90% VO2max for 4 min and 60% VO2max for 12 min on 10% and 0% inclines treadmill. Four muscle fibre types (Types I, IIA, IIA/IIX, and IIX) were immunohistochemically identified, and optical density of Periodic Acid Schiff staining (OD-PAS) in each fibre type and the glycogen content of the muscle sample were determined by quantitative histochemical and biochemical procedures. RESULTS: The changes in OD-PAS showed that the recruitment of all fibre types were identical after each exercise bout, i.e., 4 min running at 90% VO2max (8.4-9.4 m/sec on 10%, 13.9-14.1 m/sec on 0%), and 12 min running at 60% VO2max (5.4-6.0 m/sec on 10%, 7.9-11.2 m/sec on 0%). No significant differences were found in the recruitment patterns of each muscle fibre type between 10 and 0% inclined exercise bouts at the same exercise intensity. CONCLUSIONS: The recruitment pattern of muscle fibre type is mainly determined by exercise intensity (%VO2max) and duration, but not by running speed. POTENTIAL RELEVANCE: The results of this study indicate the possibility that up-hill running results in the same training effect as faster running on a flat track.
D Eto; S Yamano; A Hiraga; H Miyata
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Equine veterinary journal. Supplement     Volume:  -     ISSN:  -     ISO Abbreviation:  Equine Vet J Suppl     Publication Date:  2006 Aug 
Date Detail:
Created Date:  2007-04-03     Completed Date:  2007-05-02     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  9614088     Medline TA:  Equine Vet J Suppl     Country:  England    
Other Details:
Languages:  eng     Pagination:  349-53     Citation Subset:  IM    
Equine Research Institute, Japan Racing Association, 321-4 Tokami-cho, Utsunomiya, Tochigi 320-0856, Japan.
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MeSH Terms
Biopsy, Needle / veterinary
Exercise Test / veterinary
Glycogen / metabolism*
Immunohistochemistry / veterinary
Muscle Fibers, Skeletal / classification,  metabolism*
Muscle, Skeletal / metabolism,  physiology*
Oxygen Consumption / physiology
Periodic Acid-Schiff Reaction / veterinary
Physical Conditioning, Animal / physiology*
Time Factors
Reg. No./Substance:

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

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