下肢某些肌肉活动、膝角和纵跳效果的生物力学分析

起跳是体育项目中普遍动作之一,而原地纵跳是各种其他起跳的基础。人体起跳又是在神经系统指挥下主要由肢体协调配合,依靠肌肉收缩曳引骨杠杆,通过足对地面的作用,从而地面给人体以反作用外力,以实现人体跳起一定高度的效应。研究肌肉活动以及人体受力的时空关系对正确理解基本动作的内、外因素关系,以及对教学与训练有着理论和实际的意义。     

对我国几名优秀跳高男运动员跳高动作的运动学分析

本文对我国几名优秀跳高男运动员在实际比赛中跳高起跳动作进行研究,运用影片解析仪获得数据并经计算机处理,发现我国优秀跳高运动员助跑最后三步人体重心和速度均有明显下降,助跑最后一步的步频不是提高(国外运动员最后一步步频增0.6步/秒)而是下降0.91步/秒,起跳速度5.282米/秒不亚于国外运动员,但起跳角(83～93°)大于国外运动员(74～83°),这恐怕是我国跳高运动员成绩不理想的运动学原因。     

体育系本科生毕业论文的现状调查

本文对体育系本科生近三年来的毕业论文随机抽样调查与研究,就选题范围、科研类型、研究方法、科研时间安排等获得了定量的数据,并对存在的主要问题进行了分析,提出了解决这些问题的措施。     

A Biomechanical Analysis of the Techniques of Elite Chinese Male Long Jumpers

The purpose of this paper was to make sport-biomechanical analysis of the techniques of chinese elite male long jumpers. By using the data obtained from the computer processing of the film motion analyzer, authors found that the horizontal velocity of the chinese athletes is higher than that of the foreign athletes. But the vertical velocity, on the contrary, of the chinese athletes is lower than that of the foreign athletes. This is perhaps the reason why the results of the chinese long jumpers have not been satisfactory.     

Biomechanical Analysis of Hao Zhongwei''''s High Jump Movements

Measuring the filmed take-off movement of Hao Zhongwei during the jumping over 2-2.19m in the contest discovered that the speed of the last step of run-up and the frequency of his last step were decreasing. Although during the jumping over 2.19m the vertical component of the take-off velocity is 5.076m/s, the take-off angle was as big as 93.26° and these are perhaps some of the reasons why his jumping record was not satisfactory. This paper can be presented to the coaches and athletes as a reference to improving the movements.     

人体下肢活动的生物力学研究

本文研究的目的是通过下肢数理模型,不同姿势起跳人体重心轨迹变化,下肢主要肌肉肌电活动以原地纵跳为例进行综合性研究,揭示其内在规律,为体育教育,运动训练,选才提供生物力学基础。研究对象为１０名男性运动员,年龄为２０岁,用ＪＴＩ－肌电仪测定下肢肌肉的肌电,用Ｂｏｌｅｘ摄影机以每秒６４幅频率拍摄原地起跳动作。