Document Detail

Effect of intravenous administration of furosemide on mass-specific maximal oxygen consumption and breathing mechanics in exercising horses.
MedLine Citation:
PMID:  10566819     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: To determine whether i.v. administration of furosemide (250 mg) to horses before maximal exercise affected maximal oxygen consumption (VO2max), breathing mechanics, or gas exchange during exercise. ANIMALS: 7 healthy, well-conditioned Thoroughbred horses. PROCEDURES: 5 horses initially performed an incremental treadmill exercise test to determine VO2max 4 hours after i.v. administration of furosemide (250 mg i.v.) or placebo (saline [0.9% NaCl] solution). Time to fatigue and distance run were recorded. All 7 horses were then used to determine the effects of furosemide on gas exchange and breathing mechanics at 40, 60, 80, and 100% of VO2max. Horses were weighed immediately before exercise. RESULTS: Furosemide treatment significantly increased mass-specific VO2max (5.3%), but absolute VO2max was not significantly altered. In the 2 parts of the study, body weights were 2.9 and 2.5% higher when horses were given placebo than when they were given furosemide. Time and distance run at speeds > or = 11.0 m/s were significantly greater following furosemide administration. Furosemide treatment had no effect on breathing mechanics or gas exchange. CONCLUSIONS AND CLINICAL RELEVANCE: Previous studies have suggested that prerace administration of furosemide may have a positive effect on performance. Results of this study indicate that this may be attributable, in part, to an increase in mass-specific VO2max but not to improvements in breathing mechanics or gas exchange. Most of the increase in mass-specific VO2max appeared to be attributable to weight loss associated with diuresis induced by furosemide.
W M Bayly; R F Slocombe; H C Schott; D R Hodgson
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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:  60     ISSN:  0002-9645     ISO Abbreviation:  Am. J. Vet. Res.     Publication Date:  1999 Nov 
Date Detail:
Created Date:  2000-01-11     Completed Date:  2000-01-11     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:  1415-22     Citation Subset:  IM    
Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman 99164-6610, USA.
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MeSH Terms
Exercise Test / veterinary
Furosemide / administration & dosage,  pharmacology*
Horses / physiology*
Injections, Intravenous
Oxygen / blood
Oxygen Consumption / drug effects*
Physical Conditioning, Animal
Respiratory Mechanics / drug effects*,  physiology
Reg. No./Substance:
54-31-9/Furosemide; 7782-44-7/Oxygen

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

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