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Dynamics of ECG parameters in competitive horses under the effect of exercise

Analysis of the dynamics of electrocardiographic parameters in healthy jumping horses and horses with CVS pathologies in training showed that healthy horses reacted to physical activity by intensifying the processes of depolarization (an increase in the R wave voltage by 4%) and repolarization (an increase in the T wave voltage by 27%) in conduction system of the heart (in the second standard lead), and, consequently, an increase in ventricular systole. In sick animals, the reaction to physical activity is the opposite: a weakening of the processes of depolarization (a decrease in the voltage of the R wave by 27,8%) and repolarization (a decrease in the voltage of the T wave by 12,5%) in the cardiac conduction system (according to the second standard lead), which indicates a weakening of the systole of the ventricles. Such a response to physical activity can serve as one of the criteria for assessing the state of the cardiovascular system of jumping horses and be a prerequisite for a deeper cardiological diagnosis.