Study On Characteristics Of Muscle Force In Snatch Technique Of Elite Female Weightlifters In China

Research purpose: this study aims to through the kinematics and muscle electrical phase synchronization method to our country outstanding female weightlifting athletes snatch techniques are studied,selected the movement rhythm in kinematics characteristics,speed,height and joint Angle changes such as indicators,muscle electrical muscle activation time from among the peak amplitude,the peak amplitude,the corresponding electrical values and muscle activation time,integral contribution indicators,such as precise understanding to each stage,the characteristics of the corresponding muscles involved in power for coaches to understand the characteristics of snatch movement and provided a reference for guiding scientific training.The research object and methods: this study chooses two types for the EX-FH25 casio high-speed cameras and Mega Win6000 16 guide methods of electric meter eight athletes to participate in the test of snatch action test,participate in the test the level of the movement of athletes are athlete,ARIEL APAS,produced by our company in the United States after 3 d motion analysis system and megawin software on kinematics and muscle electrical analysis respectively,the use of Excel and SPSS26.0 for analytical data collection and analysis.Results:1.At and the height of the fluid phase as the barbell height is 0.27±0.03 m,hip and knee joint Angle change for 41±9 ° and 64±8 °,barbell velocity increment of0.808±0.171 m/s,measured muscle activation sequence is: the latissimus dorsi,shaft sma,gastrocnemius laterally,triceps,deltoid toe,glutes,muscle contribution: triceps >the latissimus dorsi muscle > vertical ridge > gastrocnemius laterally > deltoid toe >glutes;2.In the lead knee lift fluid phase barbell lifting height of 0.14± 0.03 m,the hip joint Angle is increased to 25±15 °,reduced to 19±7 ° knee joint Angle,barbell velocity increment of 0.328±0.233 m/s,measured muscle activation sequence is: the triceps,shaft sma,back,gastrocnemius laterally,musculus glutaeus maximus muscle,deltoid toe,muscle contribution rate is: the triceps muscle > vertical ridge > the latissimus dorsi > gastrocnemius laterally > deltoid toe > glutes.3.The power is in the stage of the height of the barbell up to 0.22±0.06 m,hip and knee joint Angle change to 46±12 ° respectively and 30±15 °,barbell velocity increment of 0.644±0.197 m/s,measured muscle activation sequence is: the triceps,gastrocnemius laterally,shaft sma,deltoid toe,back,musculus glutaeus maximus muscle,muscle contribution rate is: the triceps muscle > vertical ridge > the latissimus dorsi > gastrocnemius laterally > deltoid toe > glutes.4.Rising in inertial phase barbell rising height was0.34±0.05 m,the changes in the Angle of hip and knee,respectively-56 ±11°and-68±15 °,measured muscle activation sequence is: the vertical spinal muscular,deltoid toe,the latissimus dorsi,gastrocnemius laterally,triceps,glutes,muscle contribution:triceps > deltoid toe > vertical spinal muscular > the latissimus dorsi > gastrocnemius laterally > glutes;5.Next crouching support phase barbell drop height is 0.15±0.04 m,the changes in the Angle of hip and knee,respectively-40 ±14 ° and-30±15 °,barbell speed increment of 0.230±0.116 m/s,measured muscle activation sequence is: the latissimus dorsi,deltoid toe,shaft sma,triceps,gastrocnemius laterally,glutes,muscle contribution: deltoid toe > triceps muscle > vertical ridge > gastrocnemius laterally >the latissimus dorsi > glutes;6.The activation sequence of the muscles measured in the support stage was: triceps brachii,anterior deltoid,erector spinalis,lateral gastrocnemius,latissimus dorsi,and gluteus maximus.The muscle contribution rate was: anterior deltoid triceps > triceps brachii > erector spinalis > latissimus dorsi >gastrocnemius laterally > gluteus maximus.Conclusion:1.In the stage of knee extension and bell lifting,the barbell speed showed an upward trend,and the Angle of knee joint and hip joint increased to varying degrees,and the increment of knee joint Angle was greater than that of hip joint,which proved that active knee extension was mainly used to complete the work.The first muscles to be activated are the latissimus dorsi and erector spinal muscles.At this stage,the latissimus dorsi and erector spine muscles are more involved in exerting force for the purpose of hip extension.2.In the knee-pulling stage,the speed of the barbell keeps increasing,the knee joint Angle recovers,the "trough" of the knee joint Angle curve appears,and the hip joint Angle continues to increase.At this stage,the barbell is lifted by the active hip extension;The exertion of all measured muscles was lower than that of the knee extension stage.3.At the end of the power generation stage,the speed of the barbell reaches the maximum,and in this stage,the slope of the speed curve increases,and the Angle of the hip and knee also increases,which reflects the characteristics of explosive force in weight lifting.The early activation of the triceps,erector spines,and gastrocnemius muscles indicates that the force stage is generated by an active ground push and heel lift and hip extension,with the anterior deltoid,gastrocnemius,and gluteus maximus being the primary forces.4.In the process of inertia rise,the barbell speed begins to decrease,and the hip and knee angles begin to decrease.At this stage,the rise of the barbell does not only depend on the inertial rise of the velocity at the end of the force generating stage.The large participation of all muscles in the force generating stage proves that work is still being done on the barbell at this stage.5.During the squat support stage,the hip and knee angles continue to decrease and the height of the barbell begins to decrease until it reaches the support point.The upper limbs and trunk muscles are activated earlier to complete the bell receiving action of the arms,while the gluteus maximus and latissimus dorsi muscles do not actively participate in the force.In the stand stage of support,the barbell rises to the highest point and the knee joint extends more than the hip joint.This stage is mainly completed by the knee extension.