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Type: Artigo
Title: Possible relationship between performance and oxidative stress in endurance horses
Author: Gondim, Fernando Jose
Zoppi, Claudio Cesar
Silveira, Leonardo dos Reis
Preira-da-Silva, Lucia
de Macedo, Denise Vaz
Abstract: The purpose of this study was to evaluate oxidative stress, antioxidant biomarkers, and performance during a multiday 210-km endurance race. Nine endurance athlete horses participated in this study. Samples were always taken at the same times of day, before the beginning of the race and after every day of competition. Analytic measurements included glutathione reductase (GR) and catalase activity, thiobarbituric acid–reactive substances (TBARs), and reactive carbonylated derivatives. Competition intensity was low, with an average speed of 12.56 ± 0.9 km/h. Four horses were unable to finish the race because of metabolic problems or fatigue. GR activity increased progressively (P < .001) throughout the competition, and TBARs showed a significant rise compared with baseline values (P < .01) but remained at the same levels throughout the 3 days of competition. Catalase and reactive carbonylated derivatives did not show any significant alterations in any time period. The best performance was obtained from horses who demonstrated higher GR capacity and/or lower TBAR concentration. In conclusion, redox status seems to modulate horses' performance in endurance races, but further studies are needed to better determine the adequate oxidant/antioxidant ratio to acquire optimal performance
Subject: Catalase
Country: Estados Unidos
Editor: Elsevier
Rights: Fechado
Identifier DOI: 10.1016/j.jevs.2009.02.006
Date Issue: 2009
Appears in Collections:IB - Artigos e Outros Documentos

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