A Research Of Diversity And Effect Of Two Ping-pong Technical Movements: Forehand High Loop And Low Fast Loop

Through analyzing the kinematics parameters of two technical movements which are forehand high loop and low fast loop, this thesis has a systematic and comprehensive discuss towards these two movements. Since most research focus on the whole rules of them, this thesis focus on direct experiment data. The experiment subjects come from outstanding athletes of Shenyang Physical Education College. The experiment data are kinematics parameters of lower limb, center of gravity, upper limb, bat, ping-pong ball while doing two technical movements. Combined with the knowledge of sports biomechanics, sports physiology and sports anatomy, the author tries to find the characteristics and difference of two technical movements and its specific moves, and then provides theoretical reference for teaching and training these two technical movements.By analyzing and comparing those direct data, coaches and athletes can notice in essence the key points and difference of these two technical movements, especially ping-pong major students and all the ping-pong amateur could grasp the technical rules, improve their technical movements and break through the bottleneck of loop-drive techniques. The experiment conclusions are listed as below:1. Forehand high loop and low fast loop are accord with joints moving sequence, and the force are transmitted from feet, ankle, knee, hip, trunk, shoulder, elbow, wrist, hand, bat and ping-pong ball. The speed increases progressively while the largest speed appears from shoulder, wrist, hand, and elbow.2. All the joints of the left part of lower limb change obviously when doing both technical movements. The ankle of right leg bends and extorts obviously during the whole process of both movements, and the angles decrease from the right knee to the right hip. But after hitting, the angle of the right hip begins to increase.3. The center of gravity differs a lot from the beginning to the end of the swing. At the beginning, the center of gravity of forehand high loop is lower than low fast loop while at the end the former is higher than the latter. The twisting angle of trunk of the former is obviously larger than that of the latter.4. at the beginning of swing the bat, the range of all the joints of upper limb when doing forehand high loop is larger than that when doing low fast loop. And at the end of swing, the location of the upper limb when doing forehand high loop is upward while the location of that when doing low fast loop is forward5. At the very moment of hitting the bat, the angle between the ping-pong ball and the bat differ obviously, and that of forehand high loop is larger than that of low fast loop. As for the displacement of the bat, on the Y axle, that of forehand high loop is larger than that of low fast loop while on the X axle, that of the former is smaller than that of the latter.6. the moving trail of the ping-pong ball differ obviously on the angles and speed when doing two technical movements, thus the curve of arc of the ball differ obviously. When doing forehand high loop, the curve of the first arc is very obvious and the bouncing angle of the second arc is large than the other one. The ping-pong ball is still speeding up after touching the table when doing forehand high loop while the ball is slowing down after touching the table when doing low fast loop.