The relationship between response-effect cannot be understood mechanically. Tracking the current response to training load in disciplines of speed and strength character is relatively complicated. Aim of the study. The main aim of this thesis was to follow the immediate, delayed, and short-term cumulative training effect. Two hurdle runners were followed during a specific preparatory period. The training effect is rated according to changes in the level of explosive power of the lower extremities during training units in one training microcycle. Material and methods. These athletes underwent testing consisting of repeated jumps for 10 seconds on the jump ergometer (FITRO JUMPER) at the beginning of the main part of the training session, after their warm-up, and after general and specific workouts. We repeated this test after the end of the main part of the training unit. Results. We found differences in the intraindividual and interindividual reactions of runners in individual training: contact time, power in the active phase of the take-off, height of jump, and force of reflection. A reduction of effectiveness at the end of training sessions focused on speed was recorded in the performance of both athletes. Different immediate and delayed effects were recorded in the performance of both athletes in training sessions focused on strength. Regenerative training focused on endurance brought a slight immediate and also a delayed impact on the increase of effectiveness. Taking both athletes into consideration we recorded a similar body response during the first 2 days of the microcycle in the immediate and delayed effect. In the second part of the microcycle, differences were recorded in intraindividual response to training load. Conclusion. Both analyzed athletes achieved an increase in jumping explosiveness in the first part of microcycle and a decrease in the second part of the microcycle.
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