Journal of the Society of Biomechanisms

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The study was designed to analyze the jumping forehand smash motions of elite players by the three-dimensional kinematic data, and to provide this information with clarifying the basic badminton smash technique. Performances were recorded on 16mm film by two high speed cameras operating at a film speed of 250 frames per second. The jumping smashes of 4 males were selected for the analysis, and were digitized from the take-off of the jump to the end of the swing in the air. Thirty three-dimensional coordinates for the segment endpoints and racket were computed by the Direct Linear Transformation method. The results showed that rotational movement of the trunk and the shoulder, translational movement of the distal and racket head were the important movements for forehand smash in badminton. The average peak velocities of the joint of the shoulder, elbow, hand, and racket head were 3.6m/s, 8.9m/s, 12.8m/s, and 52.8m/s. The 53% of the peak velocity of racket head gained in approximately 0.032 second before contact. The time appearing instantaneously at the peak velocity of each joint of the segment was different in each segment. As other throwing performances the peak velocity proceeded from the trunk to the distal segment in order of time. But different from other throwing performances, the peak velocity of the shoulder and the elbow appeared in same timing in badminton jumping smash.

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