共查询到20条相似文献，搜索用时 93 毫秒
1.
蒋秋艳 《体育成人教育学刊》2013,29(2)
对我国优秀女子竞走运动员蒋秋艳赛前技术训练进行发析,发现:蒋秋艳步幅适中、步频较快,没有人眼可见的腾空;送髋技术动作和后蹬用力都达到了较高的水平,摆动腿摆动半径长,摆速慢;速度提升慢,造成加速不快.蒋秋艳的技术特点可为我国运动员技术训练带来诸多借鉴和思考. 相似文献
2.
我国优秀女子竞走运动员竞走技术的生物力学分析 总被引：11，自引：0，他引：11
采用摄像及录像解析等研究方法 ,对我国优秀女子竞走运动员的技术进行生物力学研究与分析。研究表明 ,我国女子竞走运动员的步长、步频、着地角及支撑腿各阶段的膝角合理 ,但身体重心上下起伏偏大 (>5cm) ,并且单步腾空时间在模糊腾空时限 ,如果竞走技术不连贯、协调、轻松 ,容易造成犯规 ,需要在以后的训练中予以纠正。 相似文献
3.
《体育科技文献通报》1999,(2)
G821.3,HL006 9900744对中外竞走技术中腾空犯规临界点的生物力学研究[HL,中,A]/杨金田,葛长玉,李东河,张维寿//第五届全国体育科学大会论文摘要汇编.-1997.-416(XG)竞走//技术//腾空//犯规//生物力学//步长//步 相似文献
4.
《体育科技文献通报》1997,(9)
G821 9703666关于对竞走腾空观察要点的研究=Study onthe main points for observing flight in heel-to-toewalking[刊,中,I]/许世岩,苏锡华,王君侠,王强,李淑媛//中国体育科技.-1997.-33(4).-54-55,57表1参1(BJ)竞走//腾空//着地//后蹬//技术//步频//研究 相似文献
5.
谭元发 《武汉体育学院学报》1990,(3)
本文使用“运动录像解析仪”,对1988年全国春季竞走比赛,不同组别各项前三名和部分犯规运动员的竞走技术进行了解析,通过分析研究,指出了竞走腾空过程与合理腾空的时间,以及我国运动员腾空时间过长的原因,等等。 相似文献
6.
竞走技术原述与违背竞走定义技术的成因分析 总被引：2，自引：0，他引：2
竞走运动员的技术必须在理解和适应竞走定义过程中完善自己的技术.竞走裁判员主要依据竞走定义对比赛中运动员实施屈腿和腾空的判定,但腾空和屈腿的产生是有缘由的.对常见造成屈腿和腾空的成因进行分析,以利技术的改进和评判. 相似文献
7.
一、前言竞走不允许腾空。尽管裁判员的肉眼无法判定一定时间的腾空,但是因腾空被判罚的事常有发生。为了使我国女子竞走运动员的技术水平有一个长足的进步,以利于第25届奥运之战,有必要研究造成腾空的主要技术原因,谨供教练员参考。二、研究对象和研究方法研究对象是我国著名的女子竞走运动员:徐永久,关平和李素杰。在一次国内 相似文献
8.
竞走犯规包括屈膝和腾空。腾空是指竞走双支撑阶段双脚同时离开地面。竞走比赛中,运动员经常出现因腾空犯规而被罚下场。如何有效地控制竞走腾空呢?我们的做法供大家参考。 竞走下肢动作分前支撑阶段、后支撑阶段、后摆阶段和前摆阶段。竞走腾空必然出现高重心,要防止腾空,就要降低重心。为了使重心降低,一方面要使后摆阶段的脚要低收低摆;另一方面在前摆阶段脚要尽量贴近地面。最重要的是,要控制前摆腿的膝关节高度,其离地高度为接近小腿长高度。做好了这几 相似文献
9.
采用文献资料和现场观察等研究方法，对１９９５年世界杯竞走赛运动员技术犯规进行了统计。结果表明，高水平的世界竞走比赛，运动员的技术犯规主要是腾空。比赛距离越短，腾空犯规的比例越高，如女子１０ｋｍ竞走，腾空犯规率高达８８．１％，而饮水、用水站处，则是发生腾空犯规的易发区。 相似文献
10.
《体育科技文献通报》1999,(4)
G821.143.2,G804.32 9901669世居高原竞走运动员营养状况调查[刊,中,A]/孙楠,范云生,杨碧英,周铃仙,殷建忠,赵春,郎佳麟,王琦//贵州体育科技.-1998(4).-21-26表6参10(TY)竞走//高原训练//营养//膳食//调研//供能G821.2 9901670竞走的关键技术与教法=Discussion on teachingmethods of key skills of speed walking[刊,中,Ⅰ]/葛长虹,史东林,李宝宅//北京体育大学学报.-1999.-22(1).-82-85参4(XG)。竞走//技术//教学法//腾空//腿部动作//骨盆在竞走教学上试图改变目前教材上的常规教学法,拟采用通过对竞走技术的分析指出其技术上的关键,并对其关键技术如防止腾空、防止屈腿、骨盆的运动及其作用与下肢快速省力的技术提出教学方法,使基层教师和教练便于掌握与操作。 相似文献
11.
运用三维图像解析方法,对张峻的旋转推铅球技术中过渡阶段的身体各主要关节角度变化进行运动学分析,目的在于通过了解在不同的时空中张峻各主要环节的角度变化,对其技术进行有效地诊断。张峻推铅球技术的过渡阶段中,投掷成绩在19 m以上时的肩髋夹角都在50°以上,且肩髋夹角与投掷成绩呈显著正相关;随着铅球成绩的提高,左肩角逐渐减小,右肩角变化不大,左髋角度逐渐加大,右髋角的变化不太明显,左膝角度有所增大,而右膝角的变化不明显。 相似文献
12.
采用文献资料法、比较研究法和归纳法，分别从逻辑思维的角度、形象思维的角度、语言学的角度和实践的角度对体育的概念问题进行探讨。认为：用形式逻辑“属＋种差”和形象思维综合概括的方法定义“体育”都不成立。从语言学的角度即主要从语用学的角度进行研究有其优点，反映了人们认识上的进步。从实践的角度出发，讲究边发展边认识是定义“体育”的一条有效途径。 相似文献
13.
This paper describes the results of a numerical study to determine the optimal flight technique for V-style ski jumping. We
attempt to answer the question of how a jumper should fly in order to increase their flight distance in a V-style posture.
The index of performance in this optimization study is the horizontal flight distance, which is mathematically equivalent
to the total flight distance, and the control parameters are the ski-operning angle and the angle of forward lean that the
jumper employs (the body-ski angle). The flight trajectory is simulated on the basis of an aerodynamic database constructed
from wind tunnel test data. It is found that the ski-opening angle should be increased in the first half of the flight, and
then maintained at a constant value during the rest of the jump. Optimal control of the ski-opening angle when there is either
a headwind or tailwind is also discussed. It is found that the jumper needs to control the skiopening angle over a wider range
in the case of a headwind than in the case of a tailwind. The jumper's skill in controlling the ski-opening angle is very
important for increasing the flight distance, especially in the case of a tailwind. 相似文献
14.
Erich Petushek Chris Richter David Donovan William P. Ebben Phillip B. Watts Randall L. Jensen 《Sports Engineering》2012,15(3):159-166
Quantifying countermovement jump (CMJ) and landing knee flexion angle is important for performance and injury risk assessment. The purpose of the study was to compare electrogoniometer (El-Gon)- and video-derived CMJ and landing knee flexion angle. Twenty-two adults performed three CMJs while knee flexion angle was simultaneously assessed using an El-Gon and video. The average systematic offset (RMSE) of the El-Gon-derived knee flexion angle throughout the entire movement was 7.03°?±?2.69°. Excellent reliability was demonstrated by the El-Gon (ICCavg?=?0.92). Countermovement knee flexion angle, maximum landing knee flexion angle and flexion angle at maximum vertical ground reaction force were 12.0°, 10.9°, and 5.7° higher, respectively, when assessed using El-Gon (p?<?0.001), compared to video. Errors between instruments are likely due to El-Gon crosstalk, misalignment and/or axis determination. The El-Gon is a cost-effective and time-efficient alternative to video analysis for the assessment of knee flexion angle if the error is accounted for and the sensor is precisely attached. 相似文献
15.
运用多刚体模型及现代计算机仿真技术,探讨人体在不同姿势下踏板所引起的跳远远度的变化特征,以寻找最佳的起跳着板姿势。结果表明:着板时小腿的姿态角、膝关节角不同组合可以使人体获得相同的远度,故仅凭着板角的大小来衡量着板技术的优劣显然是不合理的;跳远踏跳着板时刻、人体各环节姿态角对跳远距离的影响作用大小并不一致,其重要性排序依次为踏跳腿小腿的姿态角最重要,其次是踏跳腿的膝角,而躯干斜角、大腿夹角及摆动腿的膝角对跳远距离的影响相对较小;运动员在跳远踏跳着板时刻,一定存在一个最佳的踏跳腿膝关节角和小腿与地面的夹角,以这种方式上板,可获得最大的跳远距离。 相似文献
16.
对优秀男子跳远运动员助跑速度与起跳角度的研究 总被引：1，自引：0，他引：1
周强 《哈尔滨体育学院学报》2000,(3)
跳远属于斜抛运动,根据斜抛运动远度公式S=V~2sin2a/g可知,跳远的成绩与腾起初速度(V)和腾起角(a)有关。通过对中外优秀男子跳远运动员跳远技术的对比分析,发现我国男子跳远运动员提高成绩可以通过两种途径:一是提高绝对速度,同时适当降低助跑速度利用率,改进助跑最后几步的节奏,二是增大着板角和离地角,减小扇角,提高腾起角。 相似文献
17.
Nicholas P. Linthorne 《Journal of sports sciences》2013,31(5):359-372
The aim of the study was to assess the accuracy of a method of calculating the optimum release angle in the shot put. Using the proposed method, the optimum release angle that produces the greatest flight distance is calculated by combining the equation for the range of a projectile in free flight with the relations between release speed, release height and release angle for the athlete. The method was evaluated using measurements of five college shot-putters who performed maximum-effort throws over a wide range of release angles. When the athletes threw with high release angles, the shot was released from a greater height above the ground and with a lower release speed. For all five athletes, the calculated optimum release angle was in good agreement with the athlete’s preferred release angle. Each athlete had his own specific optimum release angle because of individual differences in the rate of decrease in release speed with increasing release angle. Simple models of shot-putting were developed to explain the relations between release speed, height and angle in terms of the anthropometric and strength characteristics of the athlete. 相似文献
18.
目的:描述艺术体操运动员在日常状况下和完成专项动作时脊柱异常的表现及左右对称性,探讨与之相关的因素。方法:以9名艺术体操运动员为研究对象,进行站立位脊柱X光片拍摄,获得脊柱额状面和矢状面的弯曲方向和角度;使用三维摄像方法定量评价运动员完成后搬腿动作和侧搬腿动作时的脊柱活动幅度;运用后伸肌群和双侧屈肌群测试系统对运动员的坐姿躯干后伸和双侧侧屈等长收缩力量进行测试。比较躯干活动幅度和躯干肌肉力量的左右对称性,比较不同脊柱侧凸方向间躯干活动差异。检验脊柱弯曲角度与躯干活动特征的相关性。结果:后搬左侧腿时的活动幅度显著小于后搬右侧腿(P<0.01),对应躯干向左扭转的幅度显著大于向右扭转幅度(P<0.05)。侧搬腿时躯干活动幅度越大对应的躯干扭转角度越大。胸曲角度与右侧搬腿活动幅度角存在正相关(P<0.05),与右侧搬腿躯干扭转角之间为显著负相关(P<0.05),腰曲角度与左侧搬腿活动幅度角之间存在显著正相关(P<0.05),与右侧搬腿躯干扭转角之间存在显著负相关(P<0.05)。肌肉力量方面,胸曲角度越大,3个位置躯干后伸力矩峰值越小。侧屈力量上,运动员绝大多数角度下的右屈力量显著大于左屈力量。胸曲角度、腰°曲角度分°别与不同躯干侧屈角度下右屈力矩峰值存在显著负相关。腰曲角度与左屈0、15°、30和右屈15°位置的躯干左屈力矩峰值存在显著负相关。结论:艺术体操运动员躯干两侧活动度和肌肉力量存在不对称,后伸幅度左侧大于右侧,侧屈肌力右侧大于左侧;但这种不对称与脊柱额状面上异常弯曲无明显关系;集中于躯干右侧和躯干后伸动作的训练,可能是导致胸曲变直的原因。 相似文献
19.
Optimum release angle in the shot put 总被引：1，自引：0，他引：1
Linthorne NP 《Journal of sports sciences》2001,19(5):359-372
The aim of the study was to assess the accuracy of a method of calculating the optimum release angle in the shot put. Using the proposed method, the optimum release angle that produces the greatest flight distance is calculated by combining the equation for the range of a projectile in free flight with the relations between release speed, release height and release angle for the athlete. The method was evaluated using measurements of five college shot-putters who performed maximum-effort throws over a wide range of release angles. When the athletes threw with high release angles, the shot was released from a greater height above the ground and with a lower release speed. For all five athletes, the calculated optimum release angle was in good agreement with the athlete's preferred release angle. Each athlete had his own specific optimum release angle because of individual differences in the rate of decrease in release speed with increasing release angle. Simple models of shot-putting were developed to explain the relations between release speed, height and angle in terms of the anthropometric and strength characteristics of the athlete. 相似文献
20.
This paper describes the use of Pareto-optimal solutions for the screw kick in rugby. We attempted to optimise the initial
conditions for a screw kick. The optimisation was carried out using an elitist non-dominated sorting genetic algorithm. Distance
achieved in flight is considered as an objective function, as well as the lateral deviation between the ball and the touchline,
or the flight time. Six initial conditions were defined as control parameters: the magnitude of the velocity vector, the flight
path angle, the azimuth angle, the spin rate, the pitch angle and the yaw angle. The results are summarised as follows: it
is impossible for both objective functions to be satisfied simultaneously, although the greatest distance achieved in flight
and the smallest value of the lateral deviation between the ball and the touchline, or the least flight time, is the ideal
situation. This kind of conflicting solution is called a ‘Pareto-optimal solution’. The optimal kick in Pareto-optimal solutions
made by the leg nearest the touchline produces a greater flight distance than the optimal kick in Pareto-optimal solutions
made using the leg furthest from the touchline. The initial pitch angle, which is the angle between the longitudinal axis
of the ball and the horizontal plane, should be comparable to or slightly greater than the initial flight path angle in order
to satisfy the Pareto-optimal solutions. 相似文献