| The purpose of this study is to describe and analyze the motion state,time value,center of gravity track and change,angle change of joint,from the angle of kinematics trajectory,displacement and velocity,to help standard dancers understand the principles of tango dance more deeply,to guide standard dancers to understand the principles of action more scientifically and to improve their technical level.With the help of advanced experimental instrument 8 lens infrared high speed motion capture system(Motion Analysis Raptor-4,USA),the whole process of Tango dance and left slip axis rotation of undergraduate sports dance standard dancers in our college of art was tested and photographed.The kinematics parameters,such as center of gravity movement change,hip,knee and ankle angle change,were obtained.Results:(1)The excellent group has fast movement time in the stage of force storage and slow down in the left sliding stage and the end position of shaft rotation.(2)The moving distance between the push stage and the extension stage in the excellent group was greater than that in the control group.(3)In the excellent group,the ankle support ability of the left sliding stage and the end position of the axial rotation was stronger than that of the control group.(4)There was no significant difference in metatarsal flexion,dorsiflexion,internal rotation and external rotation between girls in the excellent group and those in the control group.Conclusion:(1)in the stage of force storage,the boys in the control group were insufficient,the moving distance of the power leg was short,the torsion angle of the main leg was small,and the signal of the guide partner was weak.Excellent group boys cross and retreat stage hip joint bending,twist angle is large,form CBM turn over action,help left slip stage early double body position coordination.In the control group,the left leg hip joint rotation angle was small and the power leg movement distance was short.In the left sliding stage to the end of the shaft rotation,the control group girls left ankle open,left foot toe to partner right foot,is one of the problems that lead to shaft rotation collision.(2)The excellent group male hip joint rotation,flexing and extending army flexible and control group male,lead partner signal is strong,main leg hip joint and thigh push center of gravity ability is strong,speed is fast,can partner guide back and drive partner center of gravity move.At the stage of crossover and retreat,the excellent group has more bending,adduction and twisting,and a better partner CBM,which is conducive to the reasonable physical cooperation of double and retreat.(3)Knee flexion and extension were greater in the excellent group than in the control group.In the stage of force storage,a larger moving distance is formed;in the left sliding stage,the boys’ right knee joint bends but the soles support the ground,and the girls’ right knee joint bends inward;at the end of the shaft rotation,the knee joint bends instead of the hip.(4)The weight-bearing strength of the ankle affects the support ability of the center of gravity and the flexibility affects the rotation direction of the human body. |
