A Comparative Study On The Kinematics Characteristics Of Some Universities In Shanxi Province Have Different Grades Of Men's Volleyball Plsyers

in this paper,through the literature material method,interview method,experimental method,mathematical statistics research methods,such as selection of shanxi part man volleyball players,jump serving motion is analyzed in kinematics comparative study.In northwestern polytechnical university men's volleyball athletes,their kinematics data as reference,men's volleyball second-level athlete with xi 'an institute of physical education,the kinematics data they jump serving action comparison.First and second class athletes on the jump serving technology analysis of the characteristics and differences,and points out that the first and second class athletes men's volleyball in jump serving,a common phenomenon,and the secondary athletes existing deficiency and identify areas in need of improvement.For jump serving technology in the future training and teaching provides the quantitative indicators,help coaches put forward reasonable improvement scheme,to improve and raise the level of secondary athletes jump serving technology and performance,as well as coaches know men's volleyball athletes to jump serving the master degree of technology,provide a reference basis.Conclusion:1.The common characteristics of the two-stage players' jumping service technology:during the running stage,the athletes are all throwing the ball with one hand,and the two-step running mode is used in both front and back steps.In the jumping stage,the athletes have left and right feet from the ground,and the right knee joint Angle is less than 170.The air hitting stage is the key link that affects the speed of the hand at the stroke.The speed of the hand is correlated with the shoulder rotation Angle,hip displacement and knee Angle displacement,and the swing amplitude will affect the swing speed.At the stroke of the ball,the two groups of players held the elbow joint at about 138 points,not straight.In the landing buffer stage,there is a time interval between the landing of the left foot and the right foot.In the same case,the success rate of the two groups was more than 60%.In the order of complete technical force,the upper limbs of the ball are shoulder,elbow,wrist and hand.The lower limbs are the hips,knees and ankles,and the fastest is the terminal point.2.The difference of first and second class athletes jump serving technology : in the run-up,two groups of athletes exist significant differences in the way size,level of athletes throwing height is significantly higher than the secondary athletes;In the jump stage,the second level athlete has insufficient cushioning of the right knee,and the unilateral leg continues to stretch out too short;First and second class athletes tohit the ball in the air phase,are hand speed to hit the ball with a very significant difference,first class player hit the ball with his speed is higher than second class athletes,secondary athletes right at shoulder swing Angle,Angle of hip,knee angular displacement,the three index is lower than the level of athletes.There is an obvious gap between the height of the center of gravity and the distance between the two players.In the quality of the jump serve,the first class athlete is better than the second-class athlete.3.Secondary athletes jump serving technology can improve link: training age,body shape,physical differences will affect the jump serving technology proficiency,the quality of the height of the jump serving the ball and hit the ball.The secondary athletes can increase the number of practice and improve the physical quality to improve the consistency and quality of the service.Secondary athletes can technically was promoted by improving links including,reasonable arrangement of approach and the way the size of the stride,increased during takeoff knee to improve takeoff buffer amplitude jump height and increase the distance between,especially in the air,the onset of need coordination and to improve handwaving speed increase of amplitude.When landing buffer,it is necessary to shorten the landing time of left and right feet to prevent sports injury.