Excellent And Ordinary Male Players Just Dance Comparative Analysis Of The Action Characteristics Of "Forward And Backward Lock Step"

Research background:Just dance "step forward and backward" is a fast-moving step.During the movement,the player will combine the mechanical movement of the knee with the music beat.This is the most basic and the key to the action.Because many dance combinations and performance routines have a lot of fluidity,they also require players to maintain a standard dance and correct posture in the flow to maintain beautiful limb rhythm.The complex and varied dance steps of the dance make the teacher mostly in the classroom with the explanation and the positive back demonstration,while the students are mainly based on the simple imitation,so the students’ control of the technical characteristics and the grasp of the action essentials only stay in the qualitative feeling.In the above,it is impossible to rise to a certain theoretical level,and there is no empirical research as a basis.As a result,the quantitative technical analysis of the correct dance is theoretically blank.Especially in daily training,when emphasizing the transformation of the center of gravity of the body and the interaction between the sole and the floor,it is completely dependent on the self-recognition and judgment of the player.Research purposes:The purpose of this paper is to combine the dance movements of Cha Cha Dance with the knowledge of sports biomechanics,and apply its theory and method to scientifically analyze the forward and backward lock-up movements of excellent male players and ordinary male players,and explore the kinematics and regularity of movements.Features and comparative analysis of the two.The purpose is to find out the gap between excellent male players and ordinary male players,and provide scientific theoretical basis for dance teaching and training.Research method:In this paper,six Latin male players(excellent players)who have achieved outstanding results in the major sports dance competitions in China and 16 male players(ordinary players)in the sports and dance specials of Wuhan Sports Institute are the research objects,and the application of literature and three-dimensional image analysis is applied.,theoretical analysis and other methods,using high-speed camera means to carry out the video capture of thecompleted "forward and backward lockstep" action,and then apply image analysis technology to obtain qualitative and quantitative contrast analysis of the relevant technical parameters of the action.Research result:(1)In a complete correct dance "forward and backward lock step",the average center of gravity of the excellent and ordinary players in the X direction is the largest,that is,in the "forward lock step" : 1.065 meters,0.864 meters;The lock step is: 0.755 meters and 0.502 meters respectively.From the minimum mean value of body center of gravity displacement,the Y direction in the "forward lock step" is the smallest,respectively: 0.030 meters,-0.002meters;the "back lock step" in the Z direction is the smallest,respectively: 0.024 meters and-0.011 meters.The maximum mean value of the center of gravity of each player’s body is also in the X direction and the corresponding action phase is the same,that is,in the "forward lock step" : 1.174 meters,0.931 meters,respectively,in the "reverse lock step" : 1.129 meters,0.913 meters.(2)In a complete correct dance "forward and backward lock step",the maximum mean line speed of the excellent and ordinary players’ body center of gravity is in the X direction,but the "forward lock step" appears in the right foot(main leg)for the second time.When the foot touches the ground,the mean values are 1.457 m / s and 1.289 m / s respectively;in the "reverse lock step",when the right foot(main leg)touches the ground for the third time,the mean values are: 1.281 Meters/second,1.086 m/s.There is no significant difference between the excellent and ordinary players’ center of gravity in the Y and Z directions.(3)In a complete correct dance "forward and backward lock step",the average time of total action of excellent and ordinary players is: 4.10 seconds,4.15 seconds,among which excellent players are in "forward lock step" and "back lock step".The time used was:2.050 seconds,2.067 seconds;the average players were: 2.050 seconds,2.084 seconds.From the total time ratio of the six action stages,the outstanding players are: 22.2%,7.5%,20.3%,12.6%,11.4%,26.0%;the average players are: 19.5%,9.3%,21.0%,11.8 %,10.7%,27.7%.(4)In a complete correct dance "forward and backward lock step",the action nodes corresponding to the maximum and minimum mean values ??of the hip and knee angles ofthe excellent and ordinary players are the same,in the "forward lock step" and "reverse lock step" The maximum mean value of the left hip and knee angle is about 172 degrees,and the minimum mean value is about 150 degrees in the "forward lock step" and about 160 degrees in the "reverse lock step".In the "forward lock step",the maximum and minimum mean values of the right hip and knee angle are 170 degrees and 160 degrees respectively.In the "recession lock step",the maximum mean values of the right hip and knee angle are 165 degrees and 175 degrees respectively;The minimum mean values are 152 degrees and 130 degrees,respectively.(5)In a complete correct dance "forward and backward lock step",the excellent and ordinary players have the largest X and hip speeds in the left and right hips,and the speed averages of both the "forward lock step" and the "reverse lock step" are excellent players.More than the average player,the difference between the left and right hips in the "forward lock step" is: 0.324 m / s;0.420 m / s,the difference between the left and right hips in the "reverse lock step" is: 0.441 m / s;0.144 m / sec,the left and right knee speed differences are: "forward lock step" is 0.227 m / s,0.370 m / s;"back lock step" is 0.292 m / s,0.874 m / sec.During the whole movement process,the difference between the left and right hip and knee line speeds in the Y and Z directions is small.Analysis conclusion:(1)In a complete correct dance "forward and backward lock step",regardless of "forward lock step" or "reverse lock step",the normal and excellent players’ body center of gravity has the largest displacement in the X direction,but the average player is better than the excellent player.Moved 0.201 meters and 0.253 meters respectively.From the displacement of the center of gravity in the Y and Z directions,there are certain differences in the displacements of ordinary and excellent players in the "forward lock step".The amplitude of the upper and lower undulations of the ordinary players in the Z direction is significantly smaller than that of the excellent players 0.049 meters;There is no significant difference in the "backward lock step".(2)In a complete correct dance "forward and backward lock step",the maximum linear velocity of the body of the ordinary and excellent players in the X direction appears at the same action node,but in the "forward lock step" and "back lock" The average player in thestep is about 0.17 m/s and 0.20 m/s slower than the elite players.At the other action nodes,there is no significant difference in the center line speed between the normal and the excellent players in the Y and Z directions.(3)In a complete correct dance "forward and backward lock step",the total time for the ordinary and excellent players to complete the action is not significantly different,the mean value is about 4.05 seconds,4.15 seconds.However,there are certain differences in the time allocation of each action stage,especially in the first two stages of the whole action,that is,the total time ratio of the first two action stages of excellent players is: 22.2%,7.5%,and ordinary The players are: 19.5%,9.3%.(4)In a complete correct dance "forward and backward lock step",the action nodes corresponding to the average left and right hip and knee maximum values of the average player are the same as the excellent players.In the action nodes of “forward lock step”,there is no significant difference between the left and right hips and knee angles of ordinary players,but in the action nodes of “backward lock step”,the difference between the hip and knee angle of ordinary players is obviously different from that of excellent players.Among them,the error of the right hip and knee angle changes is the most prominent.(5)In a complete correct dance "forward and backward lock step",the average hip and knee speed of ordinary and excellent players are the fastest in the X direction,but regardless of the speed of "forward lock step" or "reverse lock step" The average player is 0.30 m/s slower than the excellent player.Among them,the average speed of the right knee line of the "backward lock step" player is the largest,reaching 0.87 m / sec.During the whole movement process,the difference between the left and right hip and knee speeds of the ordinary and excellent players is small in the Y and Z directions.