KINEMATICAL ANALYSES OF TWO STYLES IN BREAST STROKES SWIMMING

Abstract

In order to determine the best wave style technique for the youth Jordanian breaststrokers and to accurately pin point the differences in the kinematics variables a 3D analysis was conducted. Therefore, the purpose of this study was to investigate some kinematics variables of both styles: the Hip Wave Undulation (HWU) and the Hip Wave Undulation with Feet Breaking Surface (HWUBS), and to compare the variables: Stroke Length SL, Stroke Rate SR, Velocity V, Stroke Time ST, Hip Displacement HD and Feet Displacement FD. Subjects were assigned to swim at their maximum speed with both styles at different order so that the best trial according to their time was analyzed. Both males and females showed an intriguing feature of the CG body velocity curve per cycle and both had decreasing velocity in slow rate when they used (HWUBS). Thus, one may conclude that an exaggerated hip undulation was executed to allow for feet to break the surface of the water which affected their velocity reduction during the stroke cycle.