Kinematic Analysis On Slightly Spiking Techniques Of Yuan Zhi,an Outstanding Volleyball Player In China

The study has conducted a kinematic test to Yuan Zhi,one of the most outstanding volleyball players in China,by describing his techniques of slightly spiking.It does not only disclose the various dimension of his shoulder,elbow,knee,hip and wrist,but also analyses the transformation of his torso twist,trunk bending and shoulder angle throughout his movements.Meanwhile,the relationships of his body gravity,jumping height and horizontal shift are included in the research.The study mainly aimed at providing some statistics and reference to volleyball talent players' cultivation in China.Applying to the methodologies of documents,image measurement,statistics and analysis,the study has collected some valid kinematic parameters with a high-speed camera,which are mainly focused on Yuan Zhi's slightly spiking movements including approaching,jumping off,ball hitting and landing.Therefore,it has displayed the specific features of angle,speed,shift and time duration to his hip,knee and ankle movements.The study has come to the following results:Firstly,it is shown that Yuan Zhi has narrower stride and faster speed with little angle transformation of hip and knee during approaching period,which ensure his steady techniques and better performance.Secondly,comparing with world famous volleyball players,Yuan Zhi's jumping off time is almost the same as Matthew Anderson and Evan Patak,which implies that he may lose very little horizontal speed.Moreover,Yuan Zhi's shoulders angle shows a bigger transformation and a wider arm-swing during his bending and stretching period,which undoubtedly are helpful to his ball hitting techniques.Thirdly,the statistics have displayed that Yuan Zhi costs shorter torso twist time and holds a lower ball hitting point,it has also shown that his body gravity shifts with a para-curve line,while his shoulder,elbow and wrist have a distinct horizontal speed transformation,especially the speed of wrist joint declines fast during the ball hitting period.It indicates that Yuan Zhi has a better initiative control of his wrist in ball hitting.The image and video show that Yuan Zhi could hold his palm wider and wrist hooker in his ball hitting in order to fully contact with the ball.Fourthly,because Yuan Zhi is a right-hand player,he could manage his cushion with left knee joint during his landing period,otherwise,right knee cushion could result in injuries more thanoften.The study has also promoted the following suggestions:Firstly,we should conduct deeper analysis and draw more conclusions of Yuan Zhi's slightly spiking techniques,in order to provide a better reference for young players' cultivation.Moreover,research could be highly focused on approaching and jumping off techniques.Secondly,videos and images could be delivered to some senior high school and middle school teams,therefore,young players could have a better understanding about his techniques.Thirdly,based on the statistics of Yuan Zhi's techniques,we could carry out some innovation and modification in order to popularize the slightly spiking techniques both in professional competition and amateur exercises.Finally,some better and more modernized high-tech instruments and equipments are highly demanded to conduct research about slightly spiking techniques of different court positons.