Document Detail

Effect of prior high-intensity exercise on exercise-induced arterial hypoxemia in Thoroughbred horses.
MedLine Citation:
PMID:  11356804     Owner:  NLM     Status:  MEDLINE    
Strenuously exercising horses exhibit arterial hypoxemia and exercise-induced pulmonary hemorrhage (EIPH), the latter resulting from stress failure of pulmonary capillaries. The present study was carried out to examine whether the structural changes in the blood-gas barrier caused by a prior bout of high-intensity short-term exercise capable of inducing EIPH would affect the arterial hypoxemia induced during a successive bout of exercise performed at the same workload. Two sets of experiments, double- and single-exercise-bout experiments, were carried out on seven healthy, sound Thoroughbred horses. Experiments were carried out in random order, 7 days apart. In the double-exercise experiments, horses performed two successive bouts (each lasting 120 s) of galloping at 14 m/s on a 3.5% uphill grade, separated by an interval of 6 min. Exertion at this workload induced arterial hypoxemia within 30 s of the onset of galloping as well as desaturation of Hb, a progressive rise in arterial PCO2, and acidosis as exercise duration increased from 30 to 120 s. In the single-exercise-bout experiments, blood-gas/pH data resembled those from the first run of the double-exercise experiments, and all horses experienced EIPH. Thus, in the double-exercise experiments, before the horses performed the second bout of galloping at 14 m/s on a 3.5% uphill grade, stress failure of pulmonary capillaries had occurred. Although arterial hypoxemia developed during the second run, arterial PO2 values were significantly (P < 0.01) higher than in the first run. Thus prior exercise not only failed to accentuate the severity of arterial hypoxemia, it actually diminished the magnitude of exercise-induced arterial hypoxemia. The decreased severity of exercise-induced arterial hypoxemia in the second run was due to an associated increase in alveolar PO2, as arterial PCO2 was significantly lower than in the first run. Thus our data do not support a role for structural changes in the blood-gas barrier related to the stress failure of pulmonary capillaries in causing the exercise-induced arterial hypoxemia in horses.
M Manohar; T E Goetz; A S Hassan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  90     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2001 Jun 
Date Detail:
Created Date:  2001-05-17     Completed Date:  2001-07-26     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2371-7     Citation Subset:  IM    
Department of Veterinary Biosciences, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
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MeSH Terms
Anoxia / physiopathology*
Arteries / physiopathology
Bicarbonates / blood
Blood Gas Analysis
Blood-Air Barrier
Body Temperature / physiology
Hemorrhage / physiopathology
Horses / physiology*
Lactic Acid / blood
Lung Diseases / physiopathology
Physical Conditioning, Animal
Physical Exertion / physiology*
Reg. No./Substance:
0/Bicarbonates; 50-21-5/Lactic Acid

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

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