engleski

The modern sprint model

The modern sprint model is conceived on the basis of a biomechanical study of the world’s fastest runner Usain Bolt. We analysed the kinematic structure of the double running stride in the phase of maximum sprint velocity in the zone between 80 and 90 m. The parameters of the sprint stride technique were established using the 2-D kinematic analysis and the APAS software (Ariel Dynamics Inc., San Diego, CA. The recordings were made with two synchronised Casio 300 video cameras operating at the frequency of 300 Hz. The analysed space was calibrated using the measurement frame of the following dimensions: 1 m x 1 m x 2 m. The 15-segment model of the sprinter was digitized and defi ned with 18 reference points. A high level of biomechanical rationality of the sprint stride was established. The stride length was 2.72 m, the frequency 4.35 Hz, the horizontal speed of the centre of gravity 11.69 m·s-1, the duration of the contact phase 0.086 s, the duration of the fl ight phase 0.145 s and the vertical amplitude of the centre of gravity 0.049 m. The ratio between the braking phase and the acceleration phase was 37:63%. Th e vertical ground reaction force was 4106 kN. The results of the study showed a high efficiency of the stride technique, which was manifested in the parameters of the ground reaction force, the stride length and frequency, the angle velocity of individual segments and the low level of velocity reduction in the braking phase.

sprint stride; biomechanics; technique; kinematic; Bolt

nije evidentirano