[The correlation between fluid and electrolyte imbalance and indicators of stress caused by physical exercises in horses during endurance rides. [M.Sc. thesis]] | Korelacija između disbalansa tečnosti i elektrolita i pokazatelja stresa izazvanog opterećenjem kod konja u daljinskom jahanju. Magistarski rad
2010
Đoković, S.
During prolonged physical exercises, such as endurance races, a complex changes occur in equine body. Great efforts lead to significant losses of fluid and electrolytes and clinically manifest dehydration, hemoconcentration and fatigue, which is a serious stress. In order to closer examine stress reactions caused by endurance ride and the correlation between indicators of stress and the degree of fluid and electrolyte imbalance, the trial was designed for a total of 10 trained sport horses that were subjected to competition on the course load of 40 km. The effects of stress were different depending on quality of horses and level of training. All horses showed statistically highly significant increase in erythrocyte count, hemoglobin and hematocrit values, which can be attributed to the displacement of blood from the spleen and, to some extent, dehydration. Statistical findings of the biochemical parameters and electrolytes important for assessing of fluid loss were of no significance. Only the average concentrations of sodium, potassium and chloride, with small individual variations, were at the lower limit of normal values. After exercise all horses show significant increase in the number of white blood cells, with a significant increase of neutrophil-lymphocyte ratio, which can be attributed to stress reaction. This finding corresponds to a statistically significant increase in concentrations of cortisol, especially among the worst-prepared horse. Horses with the highest neutrophil-lymphocyte ratio and the highest concentration of cortisol after the exercise showed visible differences in other hematological and biochemical parameters. This primarily refers to the activity of muscle enzymes. We can conclude that the load in endurance rides on the trial of 40 km in horses with insufficient training and lesser quality is a serious stress, which greatly contributes to the imbalance of fluid and electrolyte.
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