| Recruitment pattern of muscle fibre type during flat and sloped treadmill running in thoroughbred horses. | |
| | |
MedLine Citation:
|
PMID: 17402446 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
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. |
| | |
Authors:
|
D Eto; S Yamano; A Hiraga; H Miyata |
Related Documents
:
|
9638026 - Effects of prolonged strenuous endurance exercise on plasma myosin heavy chain fragment... 19495726 - High intensity running results in an impaired neuromuscular response in acl reconstruct... 3574046 - Fluid shifts with successive running and bicycling performance. 10126486 - Taxation, regulation, and addiction: a demand function for cigarettes based on time-ser... 19744946 - Exercise training decreases store-operated ca2+entry associated with metabolic syndrome... 933326 - Maximal cardiac output in angina patients before abd after coronary artery surgery. |
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 |
Affiliation:
|
Equine Research Institute, Japan Racing Association, 321-4 Tokami-cho, Utsunomiya, Tochigi 320-0856, Japan. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Biopsy, Needle / veterinary Exercise Test / veterinary Female Glycogen / metabolism* Horses* Immunohistochemistry / veterinary Male Muscle Fibers, Skeletal / classification, metabolism* Muscle, Skeletal / metabolism, physiology* Oxygen Consumption / physiology Periodic Acid-Schiff Reaction / veterinary Physical Conditioning, Animal / physiology* Time Factors |
| Chemical | |
Reg. No./Substance:
|
9005-79-2/Glycogen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Muscle, tendon, and somatotropin responses to the restriction of muscle blood flow induced by KAATSU...
Next Document: Monocarboxylate transporters (MCT) as lactate carriers in equine muscle and red blood cells.