Kinematics And Dynamics Quantitative Analysis On Jump Spike Movement Of Excellent Volleyball Players

This paper, taking more than nine secondary volleyball players as the test object, and all of them are men. The excellent volleyball players in 4 a jump ball movement process, do the quantitative analysis of kinematics and dynamics process of takeoff action, so as to reveal the volleyball takeoff action of kinematics and dynamics characteristics. Mainly adopts the methods including literature method, test method and mathematical statistics.According to the change of the Centre of gravity, volleyball players’ step spike can be divided into three phases:the earlier cushion phase, the older cushion, pedal and stretch phase.The main indicators:the F-t dynamic curve of two sides, the moment of left foot touchdown of lower limb joint-angles, center of gravity low lower limb joint-angles, the time characteristics of each stage, horizontal speed and vertical speed characteristics and the movement and dynamic index correlation analysis with take-off height H, According to the predecessors research results and the research, the subjects are grouped for discussion. Research conclusions are as follows:Conclusion one:When taking off, the F-t power curve shape of the left-foot and right foot is similar, but on the right side of the buffer period is longer than the other; behavioral sequence of lower limb joint is hip, knee, ankle, namely large joints drive small joints.Conclusion two:When left foot-landing and center of gravity low, there is no difference between left and right sides of the hip Angles, and the Angle of the right knee and ankle joints are smaller than on the left side, buffer amplitude, the left side is bigger than on the right side.Conclusion three:because his right foot first, lower limb on the left side of the buffer significantly longer than lower limb left foot buffer, late in the early stage of the buffer and buffer, left and right sides of the lower limb joint Ang,le change is obvious different, changes in the stretching issue left-and right sides of the lower limb joints are basically the same. On the right side of contribution to the takeoff action is greater than the right, but the left side of the movement process is very short.Conclusion three:Smash takeoff, the early stage of the buffer action on maximum percentage in the takeoff time; Center of gravity horizontal velocity when both feet off the ground, and did not reduce to zero, center of gravity of the maximum vertical speed appears before the feet off the ground.Conclusion four:Different types of takeoff, the F-t power curve and joint Angle change curve is not the same, and a good jump movement is unity of all jump processes better.Conclusion five:Left and right side of the jump in the process of muscle contraction are stretched before, so we must strengthen the leg extensor group to wait long strength training; Furthermore based on the differences of left and right side lower limb takeoff action, on the left side of the practice action significantly faster than on the right side; Due to lower limb joints takeoff has power order, pay attention to when strength training so joint power order. Recommended left and right side lower limb respectively load and is consistent with the jumping action structure strength training.Conclusion six:Coming up at various stages of the lower limbs of the time, his left foot landing each joint Angle, the lowest center of gravity lower limb joint angles and highly negative correlated to the minimum height H, so suggest spiking takeoff time should not be too long, and on his left foot and center of gravity of the minimum of lower limb joint angles should not be too big.