| Effects of intensity and duration of exercise on muscular responses to training of thoroughbred racehorses. | |
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MedLine Citation:
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PMID: 17255370 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study examined the effects of the intensity and duration of exercise on the nature and magnitude of training adaptations in muscle of adolescent (2-3 yr old) racehorses. Six thoroughbreds that had been pretrained for 2 mo performed six consecutive conditioning programs of varying lactate-guided intensities [velocities eliciting blood lactate concentrations of 2.5 mmol/l (v2.5) and 4 mmol/l (v4), respectively] and durations (5, 15, 25 min). Pre- and posttraining gluteus muscle biopsies were analyzed for myosin heavy chain content, fiber-type composition, fiber size, capillarization, and fiber histochemical oxidative and glycolytic capabilities. Although training adaptations were similar in nature, they varied greatly in magnitude among the different training protocols. Overall, the use of v4 as the exercise intensity for 25 min elicited the most consistent training adaptations in muscle, whereas the minimal training stimulus that evoked any significant change was identified with exercises of 15 min at v2.5. Within this range, muscular adaptations showed significant trends to be proportional to the exercise load of specific training programs. Taken together, these data suggest that muscular adaptations to training in horses occur on a continuum that is based on the exercise intensity and duration of training. The practical implications of this study are that exercises for 15 to 25 min/day at velocities between v2.5 and v4 can improve in the short term (3 wk) the muscular stamina in thoroughbreds. However, exercises of 5-15 min at v4 are necessary to enhance muscular features related to strength (hypertrophy). |
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Authors:
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José-Luis L Rivero; Antonio Ruz; Silvia Martí-Korff; José-Carlos Estepa; Escolástico Aguilera-Tejero; Jutta Werkman; Mathias Sobotta; Arno Lindner |
Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't Date: 2007-01-25 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 102 ISSN: 8750-7587 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2007 May |
Date Detail:
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Created Date: 2007-05-07 Completed Date: 2007-07-13 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 1871-82 Citation Subset: IM |
Affiliation:
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Laboratory of Muscular Biopathology, Dept. of Comparative Anatomy and Pathological Anatomy, University of Cordoba, 14014 Cordoba, Spain. an1lorij@uco.es |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adaptation, Physiological* Animals Capillaries / physiology Cell Size Glycerolphosphate Dehydrogenase / metabolism Glycolysis Horses / physiology* Lactic Acid / blood Muscle Fibers, Skeletal / physiology Muscle, Skeletal / blood supply, cytology, metabolism, physiology* Myosin Heavy Chains / metabolism Neovascularization, Physiologic Oxidation-Reduction Physical Conditioning, Animal / methods* Physical Endurance / physiology* Random Allocation Succinate Dehydrogenase / metabolism Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Myosin Heavy Chains; 50-21-5/Lactic Acid; EC 1.1.-/Glycerolphosphate Dehydrogenase; EC 1.3.99.1/Succinate Dehydrogenase |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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