ABSTRACT. ABSTRACT. Physiological variations in serum sodium (Na +), potassium (K +) and chlorine (Cl) in half breed race horses before and after exercise were evaluated. Twenty equines, male and female, from 2 to 6 years of age were studied. Three blood samples were taken at different times: T0 (before the race), T1 (immediately after the race) and T2 (one hour after the race). Mean serum electrolytes expressed in mmol / L were: for T0: Na+ (133.9 ± 5.30), Cl-(112.7 ± 6.43), K+ (4.1 ± 0.54); T1: Na+ (133.2 ± 7.38), Cl-(113.4 ± 11.47), K+ (4.6 ± 1.15); and T2: Na+ (137.2 ± 6.23), Cl-(113.2 ± 8.31), K+ (3.9 ± 0.75). The results showed no statistically significant differences (p ? 0.05) between times T0, T1 and T2 to the average of the Na + and Cl-ions; instead the mean serum K + decreased (p ? 0.05) at T2 with respect to T1. Keywords RESUMEN.Se evaluaron las variaciones fisiológicas de las concentraciones séricas de sodio (Na+), potasio (K+) y cloro (Cl-) en caballos mestizos de carrera antes y después del ejercicio. Se utilizaron veinte equinos, machos y hembras, de 2 a 6 años de edad. Se tomaron tres muestras de sangre en diferentes tiempos: T0 (antes de la carrera), T1 (inmediatamente después de la carrera) y T2 (una hora después de la carrera). Las concentraciones séricas medias de los electrolitos expresadas en mmol/L fueron: para T0: Na+ (133,9 ± 5,30), 7 ± 6,43), K+ (4,1 ± 0,54); para T1: Na+ (133,2 ± 7,38), 4 ± 11,47), K+ (4,6 ± 1,15); y para T2: Na+ (137,2 ± 6,23), Cl-(113,2 ± 8,31), K+ (3,9 ± 0,75). Los resultados no evidenciaron diferencias estadísticamente significativas (p ? 0,05) entre los tiempos T0, T1 y T2 para la media de los iones Na+ y Cl-; en cambio la media de la concentración sérica de K+ disminuyó (p ? 0,05) en el T2 con respecto al T1.Palabras clave: electrolitos séricos, caballos mestizos, ejercicio físico.
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