Abstract
This paper shows the carried research of basic motor abilities and their changes under the influence of experimental treatment (contents from athletics) at the sample of fifth grade female students of elementary schools. The objective of the research was to determine if the application of the proposed experimental treatment, with usage of different organizational forms of work, can cause an increase in efficiency of physical education instruction. The experiment was realized in the first semester of the academic 2000, with three lessons a week (2+1), at the total sample of 98 female students of the fifth grade of elementary schools (E=57; K=41). In the sub-sample of the E-group testers, significant statistic differences in the evaluation variables were noted: speed of alternative movements, flexibility, explosive power of legs, repetitive power of stomach muscles, power of arms and shoulders, agility and persistence of running. It can be concluded that the experimental treatment influenced positively the development of basic motor abilities.