| Blood lactate responses to submaximal field exercise tests in thoroughbred horses. | |
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MedLine Citation:
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PMID: 10775469 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The associations between velocity during a standardized, submaximal 800-m exercise test and blood lactate concentration after exercise were investigated in Thoroughbred racehorses on sand and grass racetracks. Predicted lactate concentrations for each horse's exercise test velocity were calculated from the line of best fit derived from results at each racetrack. The repeatability of the differences between the measured and predicted blood lactate response to exercise was also investigated. Exercise tests were conducted at speeds ranging from 12.8 to 16.6 m/s. The variability of velocity within the exercise test was expressed as the coefficient of variation (CV) of the times for the four 200-m sections.On the sand track, the coefficient of determination for the lactate-speed relationship was highest for an exponential regression equation [lactate (mmol/L) = 0.08e(0.33x)(m/s);r(2)= 0.58, P< 0.05;n = 21]. Similar coefficients of determination were calculated for linear (r(2)= 0.56) and second order polynomial equations (r(2)= 0. 57). On the grass racetrack, the relationship was best described by a second order polynomial equation [lactate (mmol/L) = -0.87x(2)+ 28. 17x - 211.41;r(2)= 0.57, P< 0.05;n = 25]. The mean differences between the measured and predicted blood lactate concentrations in repeated tests were 1.9 +/- 1.8 (SD) and 1.8 +/- 1.7 ( SD) on the sand and grass racetracks. There were no significant associations between the velocity of the exercise and the CV on either racetrack. Differences between measured and predicted blood lactate concentrations, based on track-specific lines of best fit, have potential application in field studies of fitness in Thoroughbred horses. |
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Authors:
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A L Davie; D J Evans |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Veterinary journal (London, England : 1997) Volume: 159 ISSN: 1090-0233 ISO Abbreviation: Vet. J. Publication Date: 2000 May |
Date Detail:
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Created Date: 2000-07-20 Completed Date: 2000-07-20 Revised Date: 2003-11-14 |
Medline Journal Info:
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Nlm Unique ID: 9706281 Medline TA: Vet J Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 252-8 Citation Subset: IM |
Copyright Information:
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Copyright 2000 Harcourt Publishers Ltd. |
Affiliation:
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School of Exercise Science and Sport Management, Southern Cross University, Lismore, Australia. adavie@scu.edu.au |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Breeding Exercise Test / veterinary Horses / blood, physiology* Lactic Acid / blood* Physical Conditioning, Animal / physiology* Reference Values Reproducibility of Results |
| Chemical | |
Reg. No./Substance:
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50-21-5/Lactic Acid |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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