The University Volleyball Athletes Hard Smash And Sand Smash Kinematics Comparative Study

In this paper,eight of the outstanding members of the men's volleyball team of Jilin University were selected as the research object,and the 4-position spike was selected as the research position.The Quintic motion capture analysis system was used to carry out three-dimensional shooting.Biomechanical Analysis of Ball Action.And try to find out the similarities and differences between the spine and the hard spike.With a view to providing data support and reference for future training and competitions.After the test and analysis,the following conclusions: 1.Help run the beach when the spike and hard to spike when the stride is too small,and the pace of the pace of small.Small steps make the body flexible,easy to change the direction of movement.2.The vertical speed of the ground has an important effect on the jump height.Sand spike level speed loss rate is small,the speed is small,the center of gravity from the angle of small.Sandy spikes of the pedal extension process coherence are poor,ankle pedal extension start time is slower,whipping action is not full,the overall rhythm is not compact.3.Hard to spike swing arm for a long time,lead a short time,indicating the ball to play the ball for too long,unfavorable spike arm momentum transmission.4.Sand spike the right hip angle,right shoulder angle,right elbow angle are less than hard to spike.Indicating that the sand spike when the trunk extension is not complete.Shoulder angle in the hard spike when the value is small,indicating that the shoulder in the whipping action is very fast and coherent,can instantly give the ball a large initial speed.