Objective To study the kinematic characteristics of Luo's treading manipulation,and provide evidence-based data reference for unique manipulations of prominent senior experts. Methods Three complete treading motions manipulated by Professor Luo Caigui and beginners were recorded by using 3D motion capture technique,and their motions of hip, knee and ankle joints were recorded by using high speed camera. The dynamic changes of angle, angular speed and barycentric velocity were observed in the total cycle and at important time points, and overall and local kinematic characteristics of Luo's treading manipulation were analyzed. Results Compared with beginners,the overall cycle characteristics of Professor Luo's treading motions showed that the difference in angles of hip and ankle joints had statistical significance (P <0.01). The local characteristics showed that angular speed of knee joint changed slightly at the moment of barycenter descending to the lowest point in cycle 1 (P<0.05),and hip angle was smaller(P<0.05) and angular speed of ankle joint changed slightly(P<0.01) in cycle 3. At the moment of barycenter ascending and knee joint straightening,angular speeds of knee joint and ankle joint changed slightly(P<0.01) and barycentric velocity was smaller(P<0.01) in cycle 1. The angular speeds of hip joint and knee joint changed slightly (P <0.05), and angle of ankle joint was smaller (P<0.05) in cycle 2, and angular speeds of hip joint and knee joint changed slightly (P <0.05) in cycle 3. At the moment of barycenter descending and maximum flexion of knee joint,Professor Luo's angle of knee joint was larger, angular speed changed slightly (P <0.01), and barycentric velocity changed slightly (P<0.05) in cycle 1. The barycentric velocity was smaller (P <0.05) in cycle 2,and angles of hip joint and knee joint were smaller(P<0.01) in cycle 3. Conclusion Professor Luo's motions have obvious local characteristics, i.e. both angles and angular speeds of joints change slightly during treading period,and at the same time of keeping body stable, his motions are constant, steady, dexterous and strengthened associated activity and inertia. Luo's treading manipulations lay emphasis not only on overall stable,but also on dexterous and trigger force,and reflect the characteristics of associating activity and inertia and combining softness and hardness.%目的 研究踩跷法运动学整体特征及局部特征,为名老专家特色手法提供数据参考.方法 应用三维运动捕捉技术记录罗才贵教授及初学者各3个完整踩跷动作,高速摄像头记录操作者下肢髋、膝、踝关节的活动,比较角度、角速度、重心速度在完整周期及重要时间点的动态变化,分析罗氏踩跷法整体及局部运动学特征.结果 与初学者相比,罗教授踩跷动作的整体特征显示髋关节、踝关节角度差异有统计学意义(P<0.01).局部特征方面显示,在重心下降最低点时刻,周期1中膝关节角速度较小(P<0.05),周期3中髋关节角度偏小(P <0.05)与踝关节角速度较小(P <0.01).在重心上升膝关节打直时刻,周期1中膝关节、踝关节角速度较小及重心速度偏小(P<0.01);周期2中髋关节角速度、膝关节角速度较小(P<0.05),踝关节角度偏小(P<0.05),周期3中髋关节角速度、膝关节角速度较小(P<0.05).在重心下降膝关节屈曲最大时刻,罗教授周期1中膝关节角度偏大、角速度较小(P<0.01),重心速度较小(P<0.05);周期2中重心速度偏小(P<0.05),周期3中髋关节角度、膝关节角度偏小(P<0.01).结论 罗氏动作切换过程及施力时关节角度及角速度均较小.说明罗氏踩跷整体稳定、柔和均匀之余,又注重局部"巧劲""寸劲"发力,体现了动静结合、刚柔并济的特点.
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