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During a stressful situation, the infrared thermography can detect the alterations of the blood flow caused by the release of catecholamines and cortisol. The goal of this study was to evaluate the eye temperature change associated with physiological stress in response to a session of race training in thoroughbred horses. Thermal images of the left eye of 13 thoroughbred horses were captured before and after the last training day before their first official race and maximum eye temperature was analyzed. The respiratory rate before and after exercise was also measured and the ambient temperature and the relative humidity of the air at the stable and at the track were recorded. The experiment was performed under a complete randomized design with 13 replications. The analysis of changes in maximal eye temperature was done with an ANOVA procedure and a correlation between the maximal eye temperature, respiratory rate and Comfort Index was investigated. There was a significant increase (P<0.01) in the eye temperature measurements taken after the training session. There was a positive linear correlation between the respiratory rate and the maximal eye temperatures, but correlations between the Comfort Index and maximum eye temperature or between the respiratory rate and the Comfort Index were not found. The infrared thermography is able to effectively measure the eye temperature change, which may be related to stress levels in thoroughbred horses during race training. [ABSTRACT FROM AUTHOR]

Changes in venous blood pH, pCO2, pO2, HCO-3 and cBase, and in serum concentrations of sodium, potassium, ionized calcium and chloride were studied in eight Arabian horses during endurance ride of 60km, with controlled speed of 12km/h-. The blood samples were collected prior to the beginning (M0) of the exercise, immediately after the ride (M1) and one hour after the ride (M2), with the animals resting. Immediately after the end of the exercise (M1) the animals presented higher values for pH which, added to the increase of cHCO3- and cBase, characterized the metabolic alkalosis, probably due to losses of chloride ions in the sweat. The metabolic changes observed in M1 were quickly corrected by respiratory changes, characterized by increased pCO2 or hypoventilation. Additionally, the horses presented dehydration, hypocalcemia and hypokalemia. The metabolic disturbances observed were not associated with clinical changes.KEY WORDS: Acid-base, electrolytes, endurance, equine Avaliaram-se as alterações do pH, pCO2, pO2, HCO-3 e da cBase do sangue venoso e das concentrações séricas de sódio, potássio, cálcio ionizado e cloreto de oito cavalos adultos da raça Árabe, durante prova de enduro de 60 km de extensão, com velocidade média de 12km h-1. As amostras de sangue foram coletadas antes do início da prova (M0), imediatamente após o seu término (M1) e sessenta minutos após a realização da prova (M2), com os animais já em repouso. Imediatamente após o término do exercício (M1), os animais apresentaram aumento nos valores do pH o qual, associado ao aumento da cHCO3- e da cBase, caracterizou a alcalose metabólica, que teve como provável origem a perda de cloro no suor. As alterações metabólicas observadas no M1 foram rapidamente corrigidas por modificações respiratórias, caracterizadas pelo aumento da pCO2 ou hipoventilação. Adicionalmente, apresentaram desidratação, hipocalemia e hipocalcemia. Não se associaram os distúrbios hemogasométricos e bioquímico-séricos observados a alterações clínicas.PALAVRAS-CHAVES: Áido-base, eletrólitos, enduro, equino.

Avaliaram-se as alterações do pH, pCO2, pO2, HCO-3 e da cBase do sangue venoso e das concentrações séricas de sódio, potássio, cálcio ionizado e cloreto de oito cavalos adultos da raça Árabe, durante prova de enduro de 60 km de extensão, com velocidade média de 12km h-1. As amostras de sangue foram coletadas antes do início da prova (M0), imediatamente após o seu término (M1) e sessenta minutos após a realização da prova (M2), com os animais já em repouso. Imediatamente após o término do exercício (M1), os animais apresentaram aumento nos valores do pH o qual, associado ao aumento da cHCO3- e da cBase, caracterizou a alcalose metabólica, que teve como provável origem a perda de cloro no suor. As alterações metabólicas observadas no M1 foram rapidamente corrigidas por modificações respiratórias, caracterizadas pelo aumento da pCO2 ou hipoventilação. Adicionalmente, apresentaram desidratação, hipocalemia e hipocalcemia. Não se associaram os distúrbios hemogasométricos e bioquímico-séricos observados a alterações clínicas. PALAVRAS-CHAVES: Áido-base, eletrólitos, enduro, equino.