The aim of the paper was to show the adaptations possibilities of the younger horses in relation to older horses in training during the competition season. The training analysis has been conducted during the competition period in two repetitions. During these periods, horse training. The study involved two groups: younger horses (inexperienced) that enter the Jumping and older horses (experienced) who supposed to achieve the full development of the motor movements on the parkour. Following parameters were examined: heart rate before, during and after jumping, the temperature of the seat, and concentrations of cortisol, glucose and lactate in saliva before and after. The study showed that the analysed physiological parameters of both horses groups decreased at the end of the competitive season. The heart rate equally decreased in both groups of horses. The analysed physiological parameters in saliva were always higher in the younger group of horses compared to the older ones. Also, their concentration at the end of the competition season compared to season beginning decreased more. Monitoring of the physiological parameters in horses saliva could be recommended for evaluation of the horses’ sports condition.