Document Detail


Determination of the lactate breakpoint during incremental exercise in horses adapted to dietary corn oil.
MedLine Citation:
PMID:  10685685     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVE: To determine lactate breakpoint of horses and test for effects of training and dietary supplementation with corn oil on that breakpoint. ANIMALS: 7 healthy Arabian horses. PROCEDURES: Horses received a control diet (n = 4) or a diet supplemented with 10% corn oil (4). A training program, which comprised two 5-week conditioning periods with 1 week of rest, was initiated. Submaximal incremental exercise tests (IET) were conducted before the first and after both conditioning periods. Blood samples for determination of blood lactate and plasma glucose concentrations were collected 1 minute before IET and during the 15 seconds immediately preceding each speed change. Data collected were fit to one- and two-slope broken-line models and an exponential model. RESULTS: Good fits were obtained by application of the broken-line models (adjusted R2 > 0.92) to blood lactate concentration versus speed curves. Lactate breakpoints increased 41% after training. After training, slope 2 and peak blood lactate concentrations were greater in the corn oil group, compared with controls. Mean blood lactate concentration at the breakpoint was not affected by training or diet. Plasma glucose concentration versus speed curves also fit the broken-line models, and glucose breakpoints preceded lactate breakpoints by approximately 1 m/s in the second and third IET. CONCLUSIONS AND CLINICAL RELEVANCE: Lactate breakpoints can be determined for horses, using blood lactate concentration versus speed curves generated during submaximal IET and may be useful for assessing fitness and monitoring training programs in equine athletes.
Authors:
D S Kronfeld; S E Custalow; P L Ferrante; L E Taylor; H D Moll; T N Meacham; W Tiegs
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of veterinary research     Volume:  61     ISSN:  0002-9645     ISO Abbreviation:  Am. J. Vet. Res.     Publication Date:  2000 Feb 
Date Detail:
Created Date:  2000-03-29     Completed Date:  2000-03-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0375011     Medline TA:  Am J Vet Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  144-51     Citation Subset:  IM    
Affiliation:
Department of Animal and Poultry Science, Virginia Polytechnic Institute and State University, Blacksburg 24061-0306, USA.
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MeSH Terms
Descriptor/Qualifier:
Animal Feed
Animals
Blood Glucose / metabolism
Corn Oil / pharmacology*
Dietary Fats, Unsaturated / pharmacology*
Horses / physiology*
Lactates / blood,  metabolism*
Models, Biological
Physical Conditioning, Animal / physiology*
Running
Time Factors
Chemical
Reg. No./Substance:
0/Blood Glucose; 0/Dietary Fats, Unsaturated; 0/Lactates; 8001-30-7/Corn Oil

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


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