Kinematic parameter characteristics of treading manipulation based on three-dimensional dynamic capture technique
10.3969/j.issn.1006-2157.2018.03.010
- VernacularTitle:基于三维运动捕捉技术的踩跷法运动学参数特征研究
- Author:
Yuanhua LIU
1
;
Yue FENG
;
Qingbing LI
;
Yiwen WAN
;
Caigui LUO
;
Jian LUO
Author Information
1. 成都中医药大学 四川610075
- Keywords:
treading;
motion capture;
biomechanics;
kinematics
- From:
Journal of Beijing University of Traditional Chinese Medicine
2018;41(3):235-241
- CountryChina
- Language:Chinese
-
Abstract:
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.
