• Res. Vet. Sci. · Apr 2000

    Quantitative analysis of acid-base balance in show jumpers before and after exercise.

    • E Aguilera-Tejero, J C Estepa, I López, S Bas, R Mayer-Valor, and M Rodríguez.
    • Departamento de Medicina y Cirugía Animal, Universidad de Córdoba, Campus Universitario de Rabanales, Ctra. Madrid-Cádiz km. 396, Córdoba, 14014, Spain.
    • Res. Vet. Sci. 2000 Apr 1; 68 (2): 103-8.

    AbstractThe acid-base status of venous blood was studied in 17 show jumpers before and after exercise using both a traditional and a quantitative approach. Partial pressure of carbon dioxide (PCO(2)), pH, haemoglobin, and plasma concentrations of sodium (Na(+)), chloride (Cl(-)), potasium (K(+)), ionized calcium (Ca(2+)), total proteins, albumin, lactate and phosphorus were measured in jugular venous blood samples obtained before and immediately after finishing a show jumping competition. Bicarbonate, anion gap and globulin concentration were calculated from the measured parameters. 'Quantitative analysis' of acid-base balance was performed utilising values for three independent variables: PCO(2), strong ion difference [SID = (Na(+)+ K(+)+ Ca(2+)) - (Cl(-)+ Lact)] and total concentration of weak acids [A(T)= Alb (1 paragraph sign23 pH - 6 paragraph sign31) + Pi (0 paragraph sign309 pH - 0 paragraph sign469) 10/30 paragraph sign97]; plasma concentrations of hydrogen ion ([H(+)]) were also calculated from these variables using Stewart's equation. No significant changes in blood pH were detected after the show jumping competition. Exercise resulted in a significant increase in lactate, Na(+), K(+), haemoglobin, total proteins, albumin, globulin and anion gap, and a decrease in bicarbonate, Cl(-)and Ca(2+). PCO(2)decreased after exercise while SID and A(T)increased. A significant correlation between measured and calculated [H(+)] was found both before and after exercise. However, individual [H(+)] values were not accurately predicted from Stewart's equation. In conclusion, even though pH did not change, significant modifications in the acid-base balance of horses have been found after a show jumping competition. In addition, quantitative analysis has been shown to provide an adequate interpretation of acid-base status in show jumpers before and after exercise.Copyright 2000 Harcourt Publishers Ltd.

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