Abstract
This study was conducted to provide useful information for the scientific training of spikes and instruction, by analyzing all kinematical variants including time, distance, speed, and angle factors in open spike movements of volleyball matches. The subjects were eight women players, who participated in the 2003 University Volleyball League. The conclusion from this study is as follows. 1. The treading time in the jump section was 0.31 seconds. The rate between before and after impact in the flight section was approximately 3:2. 2. There were a lot of differences in the distribution of weights in both feet at the jumping moment depending on players. The rate of L:R was 54:46, which meant the right foot had more weight. As for the position style of the two feet, there were two types: front-back direction (S1, S2, S7, S8), which meant the left foot is front and the right back, and diagonal direction (S3, S4, S5, S6). It was found that the stride at the moment of spike was 0.54m and the moving distance in the flight section was 0.95m. 3. The speed of the ball immediately after impact was 19.41m/s. In the jumping section, the changing value of body-centered horizontal speed was -2.07m/s, and the changing value of vertical speed was 3.75m/s. 4. In the jumping section, the forward degree was 15 when the left foot took off and the backward degree was 23 when the right foot landed. The left foot angle just before jumping was 47 and the right foot angle was 40. It is appropriate that the left foot angle just before jumping is around 45. Also, it is regarded that the right foot angle should have a smaller angle than the left foot. In the jumping section, the maximum right knee angle was 115, and the maximum left knee angle was 92.