【作者】 张育铭；

【导师】 闫红光；

【作者基本信息】 沈阳体育学院 ， 运动训练学， 2010， 硕士

【摘要】 研究目的:为了揭示单板U型场地滑雪项目正脚前刃540°动作的技术特点、技术关键及运动学参数,从而科学指导训练,为运动员取得好成绩打下良好的基础。研究方法:运用影像分析法,获取刘佳宇、孙志峰、蔡雪桐三名运动员正脚前刃540°的运动学参数。研究结果:运动员在一个动作阶段的身体重心轨迹呈抛物线,在出槽前的最大速度为10m/s左右,出槽角度为55°左右,在腾空阶段的转体理论角度与实际转体角度的偏差大约80°左右,落地时最大速度可达14m/s。研究结论:1、运动员出槽技术的好坏决定了腾空的高度。出槽技术中,滑行的重心速度、出槽角度、蹬壁用力大小及蹬壁时机都是影响高度的至关重要因素。出槽阶段,应尽量减小速度方向与用刃方向偏差,身体重心应与滑行方向尽量相同,以减小速度损失。2、由于场地坡度特点及运动员出槽方向的差异,在实际技术动作中,空中转体理论角度与实际转体角度有偏差。3、助滑技术作为出槽技术的前奏,其滑行方向与轨迹对出槽质量有很大的影响,助滑阶段的理想滑行路线为直线滑行,避免弧线或者S型。4、出槽阶段蹬壁最佳时机为滑雪板中点离开壁角时刻,而落地较适宜的位置是更靠近壁角。建议1、在出槽瞬间,蹬壁动作的效果是由下肢蹬伸力量决定的,因此适当加强下肢肌肉群有利于提高运动员出槽速度。2、运动员存在着转体度数偏差,在模仿训练时,应结合实际转体度数,使运动员形成动作定型更多还原

【Abstract】 Objective: In order to reveal the technical features of, key technology and kinematic parameters, and to identify the factors that affect the flight altitude on frontside 540air of halfpip of snowboard,thus providing scientific guidance training for athletes to achieve good results and make the strong foundation.Methods: passing the way of Photograph analysis, to get the kinematic Technical parameters of frontside 540air, which from the athletes of Liu Jiayu, Sun Zhifeng and Cai Xuetong.The results: The pathing way of the athlets in one stage is parabola.the most fast speed before living the lip is about 10m/s,the angle is about 55°,the angle of the twist is about 80°between theory and actual in the air, when they are landing,the speed could be 14m/s.Conclusions:1、The quality of living the lip technical decide the athlets’highth in the air. The crucial factor of the high level are the speed of the body center of gravity, the angle of living the lip, force size and timing of the diego wall. athlets shuould control the angle and learning to use the right side of the snowboard in the moment of living the lip . the body center of gravity should be the same as far as possible with the sliding direction in order to reduce the loss of velocity.2、Because of the difference of site characteristics and slope direction of slot players, in the actual technical movement, there will be little inaccuracy between the air swivel theoretical point and the actual twist angle of the track.3、As a prelude to help smooth out the trough technology, help slide technology’s sliding direction and trajectory has a great impact on the quality slot to help smooth glide phase of the ideal line as the straight-line sliding to avoid, or S-curve.4、The best time of a tank tread wall is at the time of the middle of the snowboard living the lip while more appropriate location to landing is closer the lip.Advice:1、Moment to leave the half-pipe, the push strength of lower limb decide the effect of tread wall, therefore appropriate to strengthen leg muscles could be improve the speed of athletes out of half-pipe 2、Deviation of twist degree is widespread,so with the imitation training must be combine with the actual twist degree , to produce the movement pattern.更多还原