Study On The Biomechanical Characteristics Of The Lower Limbs Of Chen Style Taijiquan

In this paper,we use vicon infrared optical motion capture system,Kistler plantar pressure test system and noraxon surface electromyography test system in the State Key Laboratory of physical engineering of Wuhan Institute of physical education to test and analyze the foot shaking movement of the King Kong ramming platform of Chen Style Taijiquan high-level athletes,and explore the time characteristics of the movement process,joint angle of the lower limbs,foot speed and acceleration changes Characteristics,plantar pressure and plantar pressure center change characteristics,root mean square amplitude,muscle power sequence,integral EMG value and contribution rate of eight key muscles of the lower limbs,the biomechanical characteristics of Taijiquan's foot shaking action of King Kong ramming and piling are summarized and analyzed from three angles of kinematics,dynamics and surface EMG,in order to reveal the biomechanical characteristics and rules of its action process and facilitate its transportation Mobilize the intuitive understanding of the technical characteristics of the movement and the internal law of power generation,promote the further improvement of its movement technology,and provide scientific basis and reasonable suggestions for the further improvement of Chen Style Taijiquan training methods.Research findings:1)Before the shock foot touches the ground,the maximum shock foot speed is up to1066.98mm/s,but the moment before the shock foot touches the ground is not the maximum shock foot speed.During the fall process of the shock foot,it has been decelerated to prevent damage to the shock foot.The velocity of the foot is consistent with the acceleration law,but there is no direct correlation between the velocity of the foot and the maximum foot pressure at the moment of the foot.2)The ground reaction force of right foot in vertical direction is 1.98 times of body weight at the moment of foot shaking.The strong foot shaking force does not affect the stability of the body.Maintaining the stability of the body under the premise of ensuring the foot shaking force is the key technology of the foot shaking action of King Kong rammer.3)The most unstable stage of the foot shaking action of the King Kong hammer is the stage of foot shaking and suspension and the early stage of foot shaking and buffering,which mainly shows that the body's center of gravity moves backward,and the lower limbs adopt the strategy of focusing on the contraction of the left tibial anterior muscle to restore stability.4)By using the feedforward mechanism,the stability of the foot can be improved and the RMS peak value can be relatively low by consciously using the left tibial anterior muscle and the left gastrocnemius muscle before the foot shaking.5)The activation sequence of the muscles of the lower limbs in the foot shaking action of the King Kong hammer is: left semitendinosus hemimembranous muscle → left gastrocnemius muscle → left tibialis anterior muscle → right gastrocnemius muscle →left rectus femoris muscle → right semitendinosus muscle → right rectus femoris → right tibialis anterior muscle.6)The contribution rate of the right gastrocnemius and the left tibialis anterior muscle is the highest in the vibration foot movement of King Kong hammer,in which the right gastrocnemius muscle has the highest contribution rate in the vibration foot storage stage,the left tibialis anterior muscle and the right gastrocnemius muscle have the highest contribution rate in the vibration foot suspension stage,and the left tibialis anterior muscle and the right gastrocnemius muscle have the highest contribution rate in the vibration foot buffer stage.The contribution rate of leg shaking in the whole movement process is the same as that ofsupporting leg.The leg shaking quickly raises muscle fiber to shake the foot,while the supporting leg needs a long time to maintain the body stability and plays an important role in the shock foot touch buffer.