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A study on the volleyball spiking motion to place the ball crosscourt or down the line
Sports and physical training
The purpose of this study was to investigate the volleyball spiking motion for placing the ball crosscourt or down the line. Three varsity male players who were instructed to spike the ball right-side area, center area, and left-side area of the opponent court were filmed at 80 f.p.s. with two 16mm cinecameras. Nine successfully performed spiking motions were selected for the analysis, and were digitized from the start of the approach run to the end of the swing in the air. 22 three dimentional coordinates for the segment endopoints and the ball were computed by the Direct Linear Transformation Method. The kinematic data were obtained from the three dimensional coordinates. The results were summarized as follows; The average ball angles to the net just after impact were 117 degrees in R trial, 86 degrees in C trial, and 65 degrees in L trial. The larger angle in order of R, C, L trials was the same in the approach angle or the takeoff angle. But the ball angle displacement from the largest angle of R trial to the smallest angle of L trial was much larger than that of the approach angle or the takeoff angle. The normalization and averaging of the displacement data for 21 segment endpoints permitted to compare the swing motions in the air. The trunk, right arm, and legs were much flexed leftward in order of L, C, R, trials during the forward swing phase. But the left arm was fixed at the left hip joint which was near the center of gravity.
広島体育学研究 : Hiroshima Journal of Physical Education
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Graduate School of Integrated Arts and Sciences