Research On Kinematics And Muscle Force Features Of Left Rotate At Original Place In Flexible Ball

Objective: This paper analyzes the action technology of the elite athletes from the biomechanics and anatomical angles by the technology of the left side ball,and obtains the kinematics data and EMG parameters,to provide a theoretical basis for guiding teaching and training.Through the biomechanical and electromyographic analysis of the speed,joint angle and upper limb of the three stages athletes,the speed,angle characteristics and muscle participation of the left side of the fixed point were studied.So as to provide a scientific theoretical basis for the movement and force principle and technical training of soft power ball movement.In practice,the special strength training methods and methods consistent with the characteristics of the nervous muscle system are reasonably arranged,to improve the level of special training.Method: This paper selects four outstanding athletes who participated in the soft power ball national competition.Through the experiments of three-dimensional photography and surface EMG tester,the experimental data were obtained and analyzed by mathematical statistics method.Results: 1.at the the ball stage,the overall speed of the left lower limb articulation point is the maximum speed of left ankle,the speed of the left knee joint is the smallest,the speed of the right upper arm articulation point is from large to small,the right shoulder joint — right elbow — right elbow;In the lead ball stage,the overall rule of the left lower limb articulation point is the speed of the left leg,the speed of the left foot articulation point is the minimum.The speed of the right upper arm articulation point in four subjects is generally from large to small,the right hand-right elbow-right elbow joint-right shoulder joint;At the throw the ball stage,the overall velocity of the lower limb articulation point at the left of four subjects is the maximum speed of articulation point,and the speed of left hip is the minimum.The right upper arm articulation point of the four subjects as a whole grew from large to large,the right hand — the right elbow joint — the right elbow joint — the right shoulder.2.at the the ball stage,the angle of the left ankle joint of the athletes lower limb,the left knee angle,the angle of left hip joint gradually increase.The angle of shoulder joint was minimal at this moment,the angle of elbow joint and wrist angle were the greatest In the lead ball stage,and the the ball joint angle,the left knee angle,the left hip angle of the four athletes gradually increased as the four athletes.The angle of shoulder joint was minimal at this moment,the angle of elbow joint and wrist angle were the greatest At the with stage,the angle of the left knee joint of four athletes,left ankle joint angle,left hip joint angle increased gradually.The angle of the rightshoulder of the upper limb is the minimum at this moment,the elbow angle and wrist angle change the greatest.3.in the whole operation of the left side of the soft power ball,the time used by the static to the lead photograph stage is the longest,from the lead photograph to the instantaneous stage of the ball.4.from static to the ball stage,this stage is the longest in the whole stage,the leg muscles first strength.In the time of force,the right deltoid muscle force time is the longest,the left ventrolateral oblique muscle force time is the shortest,this shows the forced process of the low waist force is the least;According to the contribution rate,the right deltoid is the largest,and the left ventrolateral oblique muscle is the least.From the ball lead photograph to the ball contact to racquet face instant phase,this stage first the upper arm began to force and lower legs began to force.In the time of force,the right hamstring biceps first strength,the left triceps femoris the most,the deltoid muscle length of the longest duration;According to the contribution rate,the right deltoid is the largest,and the left ventrolateral oblique muscle is the least.From the ball contact to the racquet face instant to the ball to leave the racquet face instant phase,this stage is all in the force.In the time of force,the right hamstring biceps,left triceps,the first force,the left external oblique muscle of the latest force.The longest deltoid muscle on the right deltoid;According to the contribution rate,the right deltoid is the largest,and the left ventrolateral oblique muscle is the least.Conclusions : 1.kinematics analysis: in the the ball stage,the athletes to compare the technical actions of the other three athletes,Lead photograph is more fully prepared for the next stage.The angle of elbow joint and wrist joint of 4 athletes is close to 180 degrees,indicating that the upper limb of 4 athletes is fully extended to the left front of 4 athletes;In the lead ball stage,the athletes compared the speed and speed of the racket of the other three players,the quality is higher.Four athletes introduced the ball into the racket,the center of gravity of the speed of change,began to carry out arc lead conversion.The speed of the center of gravity of one of the athletes is the largest,and the action can be coordinated better in the lead ball;In the with stage,four athletes pedal force,the maximum speed of lower limbs,the lower extremity is gradually increasing and driving the upper limbs to do arc lead conversion.2.surface electromyography analysis: four excellent athletes in the whole process of the left side ball operation are the right triangle muscle integral score of upper extremity,the highest contribution rate.The waist integral is the smallest,indicating that the waist muscle in the whole process is not high.