The purpose of this study was to compare the changes in power and speed of running versus time for 11 year-old boys training (n-17) endurance competitions and being out of training (n-17). The estimate bases were the changing speed of power on an inclined plane and the change of speed for 400 m run in 25 m sections. In both tests each effort required maximal intensity. During the experimental period very similar characters of speed and power changes versus time were obtained for both tested groups and the differences are due to the training degree.
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