Kinematic Analysis Of "Fallaway With Reverse Slip Pivot" In Waltz Dance

Objective: "Fallaway with Reverse Slip Pivot" in waltz dance is a very common dance movement in standard textbooks and competitive combinations.The difficulty coefficient is very high,and there are many action techniques that need to be applied.The action beauty combined by action,technology and tactics is the core content of sports dance competition.This paper analyzes and studies the technical movements of "backward",so as to provide a reference for improving the quality of movements.This article aims to analyze the "Fallaway with Reverse Slip Pivot" using kinematic methods and means,so as to explore the technical characteristics and rules of the male and female partners,and summarize the differences of athletes with different movement technical levels in the movement process.Explore the kinematic characteristics,rules and mechanisms of action,distinguish the pros and disadvantages of action technology,and provide ideas and basic theoretical support for the teaching and training of standard dance in the future.Research method: through the expert interview method,3 D image analysis method and mathematical statistics method.High-speed camera was used to collect the movements completed by the subjects,and the image analysis technology was applied to obtain kinematic technical indicators such as the vertical displacement of the center of gravity,the change of left and right knee and ankle angles,and the length of each action stage.Test selected 6 standard dance competition outstanding athletes（excellent athletes）and 6 xi’an physical education university dance performance students（ordinary athletes）for the experimental research object,through Simi Motion software image analysis,Matlab software was used to interpolate Spline data for each time of each movement.Comparative analysis also analyzes the technical movement gap between excellent and ordinary athletes to provide reference for better scientific training.Results:（1）During the push movement and drop stages,athletes in the good group will use less times than those in the regular group,while athletes in the leg movement stage,the gravity rise stage,and the shaft end stage will use shorter times than those in the regular group.（2）For the male athletes in the excellent group,the lowest value of the heart height of the time after the center of gravity height（0.603m）is 0.569 m.In the general group,the lowest value of the center of gravity height was0.533 m after the center of gravity height reached the highest point（0.608m）.The female athletes in the excellent group have the highest gravity height It was 0.592 m,while the highest value of center of gravity height in the general group was 0.567m（3）The maximum angle of shoulder and hip torsion angle in ordinary male athletes was35.5°,which was 26.924° different from the highest angle of 61.924°.In excellent male sports.The maximum torsion angle was 52.17° in the rising and descending stages,while the general group was 33.243°.（4）The right knee joint flexion and extension Angle of the excellent male athletes is large.At the end of the rotation,the elite male athletes had less changes in the left knee angle.Excellent group of female luck Mobilization had smaller angles to the right knee during the push extension movement phase and leg swing movement phase.Female athletes in the excellent group have a large flexion and extension Angle in their left knee.Conclusion:（1）In the "Fallaway with Reverse Slip Pivot",the male and female athletes should accelerate in the pedal movement stage,elongate the time in the leg movement and the center of gravity rise stage,which will better form the swing of the dance movements.（2）Male athletes and female athletes should not increase their center of gravity too late,and the rise too late is easy to lead to incoherent movement.The vertical height change of the body should be relatively gentle to ensure a more smooth and stable overall movement.（3）Excellent group of male athletes and female athletes in the action of the hip twist,inversion is stronger,male athletes can in rotation movement hip lead is very obvious,female athletes can complete the action of hip guide and follow the more obvious,and excellent group of athletes can partner between the body position transformation processing more in place,action will be more smooth,range will be larger.（4）Male athletes in the elite group had a large flexion and extension angle through the right knee during the pedal movement phase,while men in the general group had a smaller right knee angle.It shows that the right leg of the excellent group stretches the leg line after the push.