Alterations of fluid and electrolyte balance in Thoroughbred racehorses following strenuous exercise during training

Alterations of acid-base status, and fluid and electrolyte balance subsequent to exercise in Thoroughbred racehorses in North America have not been well-characterized. Des-cribed here are the results of an observational study conducted to characterize changes in fluid and electrolytes following stre...

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Bibliographic Details
Published in:Canadian journal of veterinary research 1993, Vol.57 (1), p.9-13
Main Authors: Cohen, N.D, Roussel, A.J, Lumsden, J.H, Cohen, A.C, Grift, E, Lewis, C
Format: Article
Language:English
Subjects:
Acid-Base Equilibrium
acidemia
Animals
blood plasma
Blood Proteins - analysis
body weight
electrolytes
Electrolytes - blood
Electrolytes - urine
exercise
Female
Hematocrit - veterinary
Horses - blood
Horses - metabolism
Horses - urine
Hydrogen-Ion Concentration
Lactates - blood
Lactic Acid
Male
Osmolar Concentration
osmotic pressure
Physical Conditioning, Animal
Physical Exertion - physiology
racehorses
Thoroughbred
urine
Water-Electrolyte Balance
Weight Loss
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Summary:Alterations of acid-base status, and fluid and electrolyte balance subsequent to exercise in Thoroughbred racehorses in North America have not been well-characterized. Des-cribed here are the results of an observational study conducted to characterize changes in fluid and electrolytes following strenuous exercise of 16 Thoroughbreds under routine training conditions. Changes following strenuous exercise were determined for the following variables: serum concentrations of sodium (Na), potassium (K), chloride (Cl) and protein; pH of blood; osmolality of plasma and urine; body weight; and, fractional urinary excretion (FE) of Na, K and Cl. The following changes occurred during exercise: increased concentration of Na in blood; increased FE of Na; decreased concentration of Cl in blood; decreased FE of Cl; increased urinary and plasmal osmolality; weight-loss; decreased pH of blood; and, increased concentration of lactic acid. The concurrent decreased concentration of chloride in plasma and acidemia in these horses differed from the hypochloremic, metabolic alkalosis previously described among endurance horses. Acidemia was attributed to production of lactic acid by anaerobic glycolysis.
ISSN:0830-9000