The Kinematic Analysis Of Whiplash Legs To 720 Degrees Difficulty Of Classical Ballet Movements

Research purposesThrough the kinematic analysis of whiplash legs to 720 degrees difficulty of classical ballet movements , this research reveals the inherent characteristics and laws of the action,provides the corresponding theoretical basis for teaching and training. Research methodsThis paper take the specialized outstanding young teacher of Hubei Province as the research object. Mainly using the three-dimensional picture analysis and the theory analytic method, taking the related theory of sports biology mechanics as the basis, carries on the qualitative analysis and the quantitative evaluation to its technical movement.Research results1.Physical displacement ,speed and movement timeThe bodily center of gravity nearly has no departure in X and Y axis, but it move 0.200 m in the Z axis. It's speed also changes along the changing of swivel posture, and the maximum speed values of the three axes respectively are 0.515 m/s, 0.710 m/s and 1.367 m/s. It takes about 1.040 seconds to swerve the first circle, and about 0.920 seconds to swerve the second circle.2.Swinging leg speed, angle and movement timeThe speed of the swinging leg appears three obvious acceleration stages. The increasing and reducing of the hip and the knee angle decide the speed of hole body's rotation. The start of the swinging leg is launched by the rotation of the body. The time to complete the first circle is slightly shorter than the second one.3.Support leg angle and movement timeAlong with the rotation of the body and the swing of the limbs, the bodily center of gravity has two movements progress by the top digit to the low position to the top digit . And the angle changes from the maximum to the minimum, later from the minimum return to the maximum.The movement time is nealy same between the second movement time zone and the fifth movement time zone ,it is aslo the same between the third movement time zone and the sixth movement time zone. But the movement time of the fourth movement time zone is slightly shorter than the seventh movement time zone.4.Upper limb angle and movement timeThe angle between the shoulder and the elbow should be reduced and increased along the increasing and reducing of the bodily center of gravity. The movement of the upper limb and the swinging leg are basis synchronization. It just corresponds to the lowest point and the highest point of the Bodily center of gravity when the upper limb and the swinging leg is fully stretched and completely closed up. In the movement of the upper limb, even if the identical type movement, it also has a certain difference in the movement time. Conclusion1.For whip lashing legs to 720 degrees difficulty of classical ballet movements, it should control the body in the three-dimensional space displacement scope. It indicates in the macroscopic way, the more slightly the bodily center of gravity deviation regulation goes the better the body rotational stabilities are.2.The bodily center of gravity speed changes along the changing of the swivel posture. In the three axes of X, Y, Z, the speed is pindling and has no appearance difference in the front-to-back direction and left-to-right direction, but speed in the vertical direction is the fastest.The speed of the swinging leg appears three acceleration stages obviously. But they correspond the movement and the opportunity are different.3.In the rotation of the body, primers arm bands to follow and the pendulum of the swinging leg, which has manifested the physical body longitudinal axis relative mass distribution changes. And adjusted to achieve the purpose of body rotation speed. So whiplashing legs to 720 degrees difficulty of classical ballet movements satisfies the law of conservation of angular momentum.4.The rotation of the body and the swing of the limbs has the certain difference in the movement time. On the body and the swinging leg case, the rotation of the body is earlier than the swing of the leg. But the movements of the upper limb and the lower limb is at the same time.5.The degree and the timing of body folding and stretching and the bodily center of gravity position must coordinate unifies, the limbs completes receives, fully folds or fully launches when the bodily center of gravity is located on the highest and the lowest position.