The main aim of this research was a dynamics and kinematics analysis of vertical (SV) and horizontal (SH) jumps and quantify the body segments` contribution to center of mass, CM, displacement during the propulsion phase. 28 athletes from different sport modalities where the vertical jump is a basic skill have participated. We used a force platform, operating at 500 Hz, time-synchronized to a video camera that recorded at 210 Hz the sagital plane of the jumps performed on the platform. The jumps have been considered as a symmetrical movement taking place in a plane, with a mechanical coordinated model of eight segments. In the SV condition, participants had to perform a maximum vertical jump, starting from a standing position on the force platform. In the SH condition, participants had to perform a maximal horizontal jump starting from the same position. The results show a greater time for the jump in SH, (0.898 vs 1.056 s) using a strategy extension-rotation in the horizontal jumps. The net force exerted during the braking impulse is higher for SV due to the greater velocity at the beginning of this phase (-1.166 vs -0.992 m/s). There was a greater involvement of the ankle and hip in SH, with a higher contribution of the trunk during the jump, also there was a greater contribution of the arms to the vertical displacement of the CM in SV.
© Copyright 2014 Revista Internacional de Ciencias del Deporte. Alle Rechte vorbehalten.