共查询到19条相似文献，搜索用时 109 毫秒
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投掷铁饼是一个技术动作比较复杂的项目。完整的投掷铁饼技术需要运动员通过一周半的旋转和不断变换的动作形式,使铁饼在最后出手的一刹那获得最大的出手速度,以此来获得理想成绩。决定投掷远度的因素很多,正确的铁饼技术是决定投掷远度的关键因素之一。评定运动员技术动作的 相似文献
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通过分析近年世界优秀铁饼运动员的投掷技术过程,笔者试将他们的技术动作特征简要归纳为"平衡旋转、持续位移和横向的弹性用力"。旋转掷铁饼技术过程,是"人体一器械"体系通过双脚与投掷圈地面的交替作用,围绕一个动态的垂直旋转轴向前旋转位移,并使器械最后沿旋转面的切线最大速度抛射出去的过程。旋转体系的平衡稳定及加速向前、上下超越扭紧的程度,对旋转技术效果至关重要。在此体系中,人体的双上肢和投掷器械在旋转过程中形成的旋转面与旋转轴之间 相似文献
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对我国5名优秀女子链球运动员使用近景动态三维录像分析系统分析运动员的投掷技术,结果表明,第四圈双支撑阶段加速能力较强,但在第四圈单支撑阶段速度损失过大;链球旋转速度增量与各圈轨迹中双支撑与单支撑的比值有关,增大链球各圈轨迹中双支撑与单支撑的比值有助于链球旋转速度增量的提高;加大投掷动作的动作幅度,增大各圈旋转中运动员的各运动环节的最大值与最小值的差值对链球旋转速度增量的提高具有十分重要意义。 相似文献
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陈老虎 《西安体育学院学报》2007,24(3):98-100
速度是掷链球旋转过程中的主要技术指标,也是提高链球运动成绩的关键。运用高速摄影对我国8名优秀女子链球运动员投掷过程中链球速度曲线进行了比较研究,表明运动员在链球旋转中存在着最后一圈速度下降明显,超越器械拉引角不足等关键技术问题。 相似文献
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我国部分优秀男子链球运动员旋转技术的运动学分析 总被引：15，自引：1，他引：14
陈洁敏 《西安体育学院学报》2000,17(2):49-52
旋转技术是掷链球技术中最关键的环节。通过两架高速摄影机 ,对我国部份优秀男子链球运动员的投掷技术进行了拍摄并解析 :在旋转时单双支撑时间分布 ,链球加速途径 ,重心变化及链球运行斜面变化等情况进行了运动学的分析 ,从中发现我国男子链球旋转技术中存在的一些问题 ,并提出了一些建议 ,以供训练时参考。 相似文献
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少年铁饼运动员由于学习掷铁饼的时间短，且旋转掷铁饼的技术较难，不好掌握，投掷时会出现这样或那样的技术性错误，如不及早纠正就会形成错误的动力定型，影响运动成绩的提高。少年铁饼运动员旋转掷铁饼常犯的技术性错误及纠正可归纳如下： 相似文献
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采用文献资料法、三雏高速摄像法、影像解析法和数理统计法,对现阶段我国优秀女子铁饼运动员的旋转技术进行运动学分析.研究发现,划分我国优秀女子铁饼运动员旋转技术风格的运动学特征主要有以下三个:1)摆动腿的摆动方式,包括"弧线"大半径和"直线"小半径摆动;2)重心的位移轨迹,包括拐点明显的"倒7"和拐点不明显的"倒7"以及重心轨迹方向同投掷方向是否一致;3)重心位移距离的长短.这三个主要运动学特征的不同组合构成了我国优秀女子铁饼运动员不同的旋转技术风格,不同运动员间的相似运动学特征对改进技术具有重要的指导意义. 相似文献
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本文对铅球传统滑步投掷技术与目前并不流行的旋转技术进行了比较。在1972年奥运会上,巴里斯尼科夫(苏联)首次采用了铅球旋转投掷技术,但是,这项技术早在1957年1月29日就已经由克申布罗科(苏联)最先试用并将它公布于世。但是,克申布罗科只是和一些链球运动员对铅球的旋转投掷技术进行了一些尝试,虽然他取得了很好的成绩,他还不能够使高水平的铅球运动员接受这一特殊的投掷方式。众所周知,奥布莱恩(美国)是第一个在1952年奥运会上采用向后转体180度投掷技术 相似文献
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A kinematic analysis of rugby lineout throwing 总被引：1，自引：1，他引：0
To characterize rugby union lineout throwing technique, three experienced male rugby players performed throwing trials under varying conditions of distance and trajectory. Motion analysis permitted the recovery of joint centre coordinates at 120 Hz and the construction of a three-dimensional linked segment model for calculation of joint angle and centre of mass time histories. All participants exhibited greater accuracy at shorter throwing distances, although the accuracy decrement was less in players of higher standard. Participants demonstrated different alterations in technique when performing throws of longer distances, either showing increased magnitudes of upper-body joint angle velocities (less accurate thrower) or lower-body joint velocities (more accurate thrower). The most elite thrower exhibited greater consistency in timing of peak joint angle velocities, with an overall standard deviation of 0.008 s compared with 0.027 s for the least accurate thrower. Data from participants of lesser ability suggest that changes are made to both magnitudes and timing of joint kinematics, which leads to increased variability in performance. The implications for players and coaches include the need to develop core strength to permit limited changes to the timing and magnitude of upper-body joint actions while allowing sufficient end-point velocity to be imparted on the ball. 相似文献
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我国优秀标枪运动员投掷步技术分析 总被引：5，自引：0，他引：5
通过对我国优秀标枪运动员 2 9人次投掷步技术纪录影片的解析 ,并与世界优秀运动员投掷步有关环节运动学参数变化的对比分析发现 ,我国男子标枪运动员投掷步第 1、2步躯干后倾角过大 ,使第 2～ 3步躯干后倾角变化量相对较小 ,影响了交叉步的动作幅度。我国女子标枪运动员交叉步存在的主要问题是下肢前移幅度不够。男女运动员都存在着投掷步第 4步左膝弯屈程度较大 ,左侧支撑无力的现象。 相似文献
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Sara M. Brice Doug Rosemond Keith Lyons Mark Davis 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(2):274-287
The development of cable force during hammer-throw turns is crucial to the throw distance. In this paper, we present a method that is capable of measuring cable force in real time and, as it does not interfere with technique, it is capable of providing immediate feedback to coaches and athletes during training. A strain gauge was mounted on the wires of three hammers to measure the tension in the wire and an elite male hammer thrower executed three throws with each hammer. The output from the gauges was recorded by a data logger positioned on the lower back of the thrower. The throws were captured by three high-speed video cameras and the three-dimensional position of the hammer's head was determined by digitizing the images manually. The five best throws were analysed. The force acting on the hammer's head was calculated from Newton's second law of motion and this was compared with the force measured via the strain gauge. Qualitatively the time dependence of the two forces was essentially the same, although the measured force showed more detail in the troughs of the force–time curves. Quantitatively the average difference between the measured and calculated forces over the five throws was 76 N, which corresponds to a difference of 3.8% for a cable force of 2000 N. 相似文献
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本文采用三维录像解析法、Person相关分析等方法,以2007年全国田径锦标赛中孙太凤的5次有效投掷技术为研究对象,对孙太凤掷铁饼最后用力技术阶段的运动学参数与投掷成绩进行相关分析,结果显示：在左脚着地瞬间以及铁饼出手瞬间存在着与投掷成绩密切相关的运动学参数,同时,在最后用力的初始加速阶段、最后用力的最后加速阶段以及整个最后用力阶段也存在着与投掷成绩密切相关的运动学参数。 相似文献
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本文通过文献资料法对掷铁饼运动的起源、发展趋势进行了系统的分析与论述。结果显示：掷铁饼运动起源于人类早期的生产劳动;掷铁饼技术大致经历原地投掷、上步投掷、侧向旋转投掷以及背向旋转投掷几个阶段;将来掷铁饼技术的发展趋势为：继续提高器械出手速度并保持良好的出手初始状态,加快和完善旋转技术,加强旋转与最后用力的衔接连贯,充分发挥基本技术原理与个人特点的完美结合。 相似文献
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采用两台JVC9800高速摄像机以200fps的速度同步拍摄优秀青少年男子铁饼运动员吴健的铁饼投掷技术,并采用SIMI-motion录像解析系统进行图象解析.分析与诊断他的投掷技术并与优秀运动员进行比较研究,对加强我国男子铁饼后备人才队伍的建设和提高我国铁饼的整体水平具有重要意义. 相似文献
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该研究使用运动测速雷达仪,结合高速电影摄影,对我国优秀男子标枪运动员的投掷技术进行了比赛现场测试,获得了大量有用的曲线与数据。整理分析后,揭示出优秀运动员助跑速度的变化及其与投掷成绩的关系。为今后掷标枪枝术的理论和教学训练实践,提供了较有价值的理论参考。 相似文献
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Development and validation of a method to directly measure the cable force during the hammer throw 总被引：1，自引：0，他引：1
Brice SM Ness KF Rosemond D Lyons K Davis M 《Sports biomechanics / International Society of Biomechanics in Sports》2008,7(2):274-287
The development of cable force during hammer-throw turns is crucial to the throw distance. In this paper, we present a method that is capable of measuring cable force in real time and, as it does not interfere with technique, it is capable of providing immediate feedback to coaches and athletes during training. A strain gauge was mounted on the wires of three hammers to measure the tension in the wire and an elite male hammer thrower executed three throws with each hammer. The output from the gauges was recorded by a data logger positioned on the lower back of the thrower. The throws were captured by three high-speed video cameras and the three-dimensional position of the hammer's head was determined by digitizing the images manually. The five best throws were analysed. The force acting on the hammer's head was calculated from Newton's second law of motion and this was compared with the force measured via the strain gauge. Qualitatively the time dependence of the two forces was essentially the same, although the measured force showed more detail in the troughs of the force-time curves. Quantitatively the average difference between the measured and calculated forces over the five throws was 76 N, which corresponds to a difference of 3.8% for a cable force of 2000 N. 相似文献