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Running at an even pace is, in both physical and tactical aspect, an essential factor when achieving good results in middle and long distance races. The appropriate strategy for running a tactically effective race starts by selecting the optimal running speed. Two models of training lasting for six weeks were applied on the group of subjects (N=43) composed of students from the Faculty of Sport and Physical Education, University of Belgrade. The aim of the study was to determine how the applied models of training would affect the deviations of running speed from the mean values in 2400m races when running for the best result and also, how the applied models of training would affect the improvement of aerobic capacities, showed through maximal oxygen uptake. The analysis of the obtained results showed that no statistically significant differences in the average deviations of running speed from the mean values in 2400m races were recorded in any of the experimental groups either in the initial (G1=2.44±1.74 % and G2=1±0.75 %) or the final measurements (G1=3.72±3.69 % and G2=4.57±3.63 %). Although there were no statistically significant differences after training stimulus in either final measurements, the subjects achieved better result, that is, they improved the running speed in the final (G1=4.12±0.48 m/s and G2=4.23±0.31 m/s) as compared with the initial measurement (G1=3.7±0.36 m/s and G2=3.84±0.38 m/s). The results of the study showed that in both groups, there was a statistically significant improvement in the final measurement (G1=56.05±6.91 ml/kg/min and G2=59.55±6.95 ml/kg/min) as compared to the initial measurement (G1=53.71±7.23 ml/kg/min and G2=54.58±6.49 ml/kg/min) regarding the maximal oxygen uptake so that both training models have a significant effect on this variable. The results obtained could have a significant contribution when working with students and school population, assuming that in the lessons of theory and practical teaching they are first educated and then, over a relatively extended period of time, are enabled to develop their own 'sense of space and time' with an aim to increase the efficiency of running in middle and long distance races, which in the end manifests itself through achieving better results

The effect of two training models on the average changes in running speed in 2400m races