背向滑步式掷铅球的三维运动学分析

Three-Dimensional Kinematic Analysis of Back Gliding Shot Put

为探索优秀男子铅球运动员个体动作技术特征;文中利用瑞士产AOS高速摄像运动捕捉系统,其中两台摄像机以120帧/s拍摄频率进行三维同步拍摄,截断频率为6Hz;建立20个关键点的人体和器械模型,数据解析应用美国产Kwon3D软件进行解析;应用EXCEL2003进行数据处理。得到铅球投掷各个阶段的关节角度、耗时、末速度、肢体位移、铅球出手速度、高度、角度等运动学参数及相关动作特征画面人体棍图或铅球运动轨迹.通过对两名样本运动学参数的分析,得出铅球的运动成绩构成中,出手初速起主导作用,出手角次之,出手高度作用最小.

The study was to explore technigal features of elite Male Shot Putters’actions.The AOS high-speed camera system made in switzer land,were used,with two of the cameras synchronously recording the actions from different angles （the recording frequency is 120 frames/sec and the cut off frequency is 6 Hz）.The human body and equipment models at 20 key points were established.Kwon 3D software and EXCEL2003 were used to analyze and process the experimental data.The kinematic parameters at each stage were obtained,such as joint angle,elapsed time,final speed,physical displacement,shot speed,height,angle as well as the human stick graph or screen shot traj ectory. Through analyzing the kinematics parameters obtained from two samples,it is concluded that,in the configuration of shot putting performance,the follow-throw velocity is dominant,the throw angle takes second place and the throw height is of the least importance.