Swimming performance is determined through several factors. In our work we concentrated on the technique of breast stroke. We used the method of tachography to measure the instantaneous velocity of a swimmer in one swimming cycle and to set velocity profiles. 18 elite swimmers, 11 male and 7 female, took part in the measurement. In the following analysis, we divided the curve into three parts and calculated 22 parameters, characterized by the curve and thus the swimmer.s technique. The relationship between basic variable, mean velocity in a swimming cycle and other 21 characteristics of a swimming cycle were determined through a statistical method of paired correlation. On the basis of derived results it is possible to state that a significant relationship (at P 0.01) between the mean velocity in a swimming cycle and 11 of the characteristics has been found. With the remaining 10 characteristics, any significant relationship failed to surface. On the basis of this analysis it is possible to determine crucial points of the technique as a reflection of its quality and thus to concentrate on them in practice.
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