In order to explore the relevant factors and the completion of difficult movements, this paper is an important theoretical basis for improving and constructing the evaluation of athletes’ movement quality. It presents a kinematic analysis of the difficult movements of competitive Tai Chi, taking the difficult movements of the swirl group of competitive aerobics as the research object. The data is collected by different methods. When completing difficult movements, due to different personal exercise habits, this paper takes the right leg as the swinging leg and the left leg as the take-off leg when completing the difficult movements. The test object in this paper adopts the traditional three-step up-step method. The starting time of the take-off stage is consistent with the illustration. By consulting experts for the stage division of the difficult movement, the two movement stages are equally divided into three stages according to the needs of the research: take-off, soaring, and landing. The results show that, from the moment the left foot hits the ground to the moment of maximum cushioning, the angles of the right knee are 176.48° and 165.06°, respectively, and the flexion of the right knee is not large; especially when the left foot touches the ground, the right leg is close to a straight line, indicating that the athlete’s body is in a straight line. The posture is relatively good, the left foot is used as the grounding leg, the angle of the knee joint is reduced from 160.82° to 124.41°, and the left knee buffer angle is 36.40°. As the right leg swings to the ground, the left knee and left hip are slightly stretched, and the right knee and right hip are slightly flexed. This change is also reflected in the fact that the center of gravity changes from the direction of the horizontal speed at this stage. Move the left side of the body slightly to the right. Difficulty movements are different in the landing stage, and their joint parameters are also different. When the landing leg touches the ground, there is no significant difference in the maximum cushioning time, the degree of torsion of the shoulder and the hip is different, the relative rotation position of the shoulder and the hip is opposite, and the posture of the shoulders at the time of landing is different. In teaching, the landing leg and the end direction of the rotation are not the same; it is necessary to strengthen the strength training of the legs, to experience the force feeling of the different degrees of rotation of the shoulder joint and the hip joint, as well as the spatial perception ability, and take the initiative to actively land. The magnitude of the rear cushion and the coordination of the trunk and the limbs are used to avoid unnecessary damage during the landing phase.

中文翻译：

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民族传统体育中跳跃难度动作的生物力学分析

为探讨高难度动作的相关因素及完成情况，本文为完善和构建运动员动作质量评价体系提供重要的理论依据。以竞技健美操漩涡组高难度动作为研究对象，对竞技太极拳高难度动作进行了运动学分析。数据是通过不同的方法收集的。在完成高难度动作时，由于个人锻炼习惯不同，本文在完成高难度动作时以右腿为摆动腿，左腿为起跳腿。本文的测试对象采用传统的三步上步法。起飞阶段的开始时间与图示一致。高难度动作的阶段划分请教专家，将两个动作阶段根据研究需要平均分为起飞、腾空、降落三个阶段。结果表明，从左脚着地的那一刻到最大缓冲的那一刻，右膝的角度分别为176.48°和165.06°，右膝的屈曲幅度不大；特别是当左脚着地时，右腿接近于一条直线，说明运动员的身体在一条直线上。姿势比较好，左脚作为接地腿，膝关节角度从160.82°减小到124.41°，左膝缓冲角度为36.40°。随着右腿摆动到地面，左膝和左臀部微微伸展，右膝和右髋微屈。这种变化还体现在这一阶段重心从水平速度方向的变化上。将身体的左侧稍微向右移动。落地阶段的动作难度不同，其关节参数也不同。落地腿着地时，最大缓冲时间无明显差异，肩部和臀部的扭转程度不同，肩部和臀部的相对旋转位置相反，着陆时的肩膀是不同的。在教学中，落地腿和旋转的终点方向不一样；需要加强腿部力量训练，体验肩关节和髋关节不同程度旋转的力感，以及空间感知能力，主动主动落地。后坐垫的幅度以及躯干与四肢的协调性，用于避免落地阶段造成不必要的伤害。