Biomechanics analysis of badminton forehand smash in standing classification disability players

Abstract

High-velocity smashes are required by players to complete profitable rallies. The research purpose was analyzed the biomechanics of the badminton forehand smash in standing classification disability players. The research sample is Suryo Nugroho (a para-badminton player with standing upper classification (SU5)). The badminton forehand smash movements analyzed include the jump stage and the arm swing stage. The forehand smash movement is analyzed with dartfish software. Microsoft Excel used to calculate angular velocity, velocity and kinetic energy of shuttlecock, force, and power. The results showed that the shuttlecock speed of Suryo Nugroho’s forehand smash was 15.07 m/s. This speed was indicated by the shoulder angle of 164.6, the elbow extension angle of the hitting arm of 148.3, the frontswing angle of 10.80 rad/s. The kinetic energy of the moving shuttlecock is 0.62 J which is transferred by the arm swing force of 0.31 N and the arm swing power of 4.69 J/s. At the beginning of the forehand smash, Suryo Nugroho jumps using both legs with a knee flexion angle of 101.6 and a knee extension angle of 177.9 produces a force of 302.94 N and a power of 342.6 3 J/s. Suryo Nugroho’s jump height was 0.43 m to reach the shuttlecock as high as 2.95 m and resulted in a steep shuttlecock trajectory with a depression angle of 15.4. In this study, it can be concluded that in performing a forehand smash to produce optimal shuttlecock speed, it is necessary to pay attention to the shoulder angle, elbow extension angle of the hitting arm, frontswing elbow angular speed, kinetic energy of the moving shuttlecock which is transferred by force and power. In addition, the jump at the beginning of the smash movement plays a role in the steep shuttlecock trajectory, which is carried out using both feet and is influenced by the angle of flexion and extension of the knee, force, and power.