The Biomechanical Analysis Of Pigua-Quan Movement Of Daofawulei

Propose: Piguaquan is an ancient kungfu with the main technical characteristics of cutting and hard hanging,long-range strike and fast punch.“lulujin” is one of the main strength of Piguaquan.In the Piguaquan system,The fifth of “Shierdatangzi” is“Daofawuleiluluzhuan” mainly practices the strength of "Lulujin" through the action of Daofawulei.Daofawulei is a basic and representative action of Piguaquan.Therefore,the study of Daofawulei can not only reveal the biomechanical characteristics of its movements,but also reflect the characteristics of Piguaquan.Through the biomechanical analysis of the Daofawulei movement,the kinematic characteristics of the Daofawulei movement are analyzed,which provides a scientific basis for the formulation of movement norms.This paper analyses the leg muscle activity in the Daofawulei movement,and provides a theoretical basis for teaching and training.Method: This research divides the Daofawulei movement into four stages: left fist splitting stage,right fist splitting stage,left right fist splitting stage and left left fist splitting stage.This study used three-dimensional high-speed camera(120Hz)and electromyogram(1000Hz)were used to measure synchronously,Six subjects completed the reverse thunder action at the calibrated position of the site and recorded a successful action.Acquisition of EMG data and synchronous shooting MageWin6000 was used to analyze the amplitude change of sEMG.These include:RMS value and muscle activation sequence of four muscles of left and right lower extremities at each stage.And APAS three-dimensional image analysis system in the United States,19 points on the human body were processed,and the results of correlation Velocity,Angle,Time and Displacement were obtained.Result:(1)The total time to complete the Daofawulei was 2.08+0.11 s,and the longest time to complete the left fist splitting stage was 0.86+0.07 s.(2)During the left fist splitting stage,the speed of left fist has two peaks,the maximum speed is 11.64 + 1.15m/s.(3)In the right fist splitting stage,the peak speed of the right fist is13.84+1.31m/s.(4)The angle of right knee joint at the beginning of left fist splitting stage was111.58+13.02o,the angle of left hip joint and right hip joint were 113.86+10.41oand118.38+11.22orespectively,and the angle of left shoulder joint was 27.64+4.76o.(5)At the Zuoquanpi stage,the force of each muscle was left biceps femoris(0.78),left rectus femoris(0.63),left anterior tibialis(0.45),right rectusfemoris(0.39),right biceps femoris(0.33),right gastrocnemius(0.21),left gastrocnemius(0.20)and right anterior tibial muscle(0.20).(6)The starting sequence of EMG of lower limb muscles in Zuoquanpi stage is right rectus femoris,right anterior tibialis-left rectus femoris,left anterior tibialis-left biceps femoris-right biceps femoris-left gastrocnemius-right gastrocnemius.Conclusions:(1)In the Daofawulei movement,Right fist splitting stage is the main splitting stage.the right fist splitting stage takes less time,and the left fist splitting stage provides a larger initial speed for the right fist splitting.The peak speed of the right fist in the right fist splitting stage is larger than that of the left fist splitting stage.(2)In the fast splitting of Daofawulei movement,the body center of gravity does not fluctuate greatly.(3)In the four stages of the whole Daofawulei,because the first two stages are the same as the latter two stages,the direction is opposite.After standardization of each muscle in the four stages,RMS showed that the strength of the whole muscle activity was gradually transformed from the left leg to the right leg,which was consistent with the structure of the movement.(4)The force sequence of the left fist splitting stage of the Daofawulei movement conforms to the principle of the force sequence of the body link.