The study was performed on 12 sport horses Blood was taken 3 times before and after exertion, also checked heart rate and count of breath.Made calculate indicates reaction on exertion and indicates sport success. Horses were divided into two groups, with lower indicate sport success (group I) and higher indicate sport success (group II). Made analyses differences between groups and between parameters before and after exertion. Horses with better sport results (group II) had more significant differences between blood parameters before and after exertion. They had lower mean hart rate after training and lower indicate reaction on exertion, than horses group I. In this study better tolerance exertion by horses group II, reflected better result in sport.

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