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1.
我国优秀女子铅球运动员背向滑步推铅球技术动作速度节奏的特征与模式研究 总被引：8，自引：1，他引：7
肖林鹏 《天津体育学院学报》2002,17(1):30-32
以我国国际健将级女子铅球运动员为研究对象，采用高速摄影及解析、生物力学分析等方法，对女子铅球运动员背向滑步推铅球技术动作相关运动环节的速度节奏与铅球出手初速度之间的关系进行了研究，并通过数学方法建立了模型，以探讨我国优秀女子铅球运动员正确运用背向滑步推铅球技术动作的规律及特征，从而为提高我国女子铅球运动水平提供理论参考。 相似文献
2.
通过对运动员技术解析所提供的世界优秀男子铅球运动员的生物力学参数,对运动员的技术进行比较,分析了滑步和旋转推铅球技术之间以及不同旋转技术类型之间所存在的差异。重点研究了铅球本身和运动员身体的加速问题,从而得出了运动员和铅球这一系统的加速到出手阶段铅球最后加速动作序列过程变化特征,为高水平铅球运动员技术训练提供理论依据。 相似文献
3.
目前在国际大赛掷铅球项目竞赛中，取得优异竞技成绩的部分运动员采取了旋转推铅球技术，这种技术屡创佳绩，成为近年来铅球技术研究的热点，本文通过研究旋转式推铅球技术特点，结合我国运动员实际，为我国运动员采用旋转式推铅球技术训练提出合理化建议。 相似文献
4.
一、调研内容: 通过对一九七八年全国田径达标赛铅球项目的调研,我们对我国铅球运动员的技术和形态等情况,进行了分析,并对如何进一步提高我国铅球成绩和青少年运动员铅球教学训练中的某些问题进行了探讨。 相似文献
5.
优秀女子铅球运动员双脚支撑阶段速度节奏的特征与模式研究 总被引：1，自引：0，他引：1
背向滑步推铅球双脚支撑技术阶段是获得铅球出手初速度的重要环节，以生物力学方法，对我国优秀女子铅球运动员双脚支撑阶段相关运动环节及铅球的速度节奏进行了研究，研究发现，右膝与左踝速度是影响铅球运行速度的最重要因素，建立了有关运动环节速度节奏与铅球速度之间的数学模式。在一定范围内，可以进行铅球速度的评价和预测。建议优秀女子铅球运动员应加强双脚支撑阶段，各有关运动环节速度及其运作结构改进方面的训练，并特别重视双脚支撑阶段运动员铅球速度的提高。 相似文献
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马志云 《山东体育学院学报》2008,24(4):68-71
通过文献资料、专家访问、近景动态立体摄像测量、三维运动学分析、数理统计等方法,以我国8名优秀男子铅球运动员为研究对象,对推铅球过渡阶段技术进行了分析研究.结果显示:过渡阶段,我国8名运动员的铅球速度减小值较大;过渡时间较长,平均值为(0.1±0.04)s;我国运动员上体控制不理想. 相似文献
8.
对优秀女子铅球运动员衔接技术球速理想值的探讨 总被引：4，自引：0，他引：4
刘嘉津 《上海体育学院学报》1996,20(2):53-59
以12名中外优秀女子铅球运动员的26次较为理想的试掷为依据,对铅球衔接技术的平均球迷进行分析。建立了不同技术状态下过渡阶段铅球平均球迷理想值大小的球迷模式,并以此对我国优秀女子铅球运动员过渡阶段铅球球速作了简要分析。 相似文献
9.
运用文献资料法、数理统计法、对比分析法和归纳法,对1987~2012年中外女子铅球运动员最好成绩进行比较研究,同时对中外女子优秀铅球运动员的身高、体重及年龄特征进行对比归纳,结果表明：中国女子铅球运动水平提高幅度缓慢,与国外女子优秀铅球运动员的成绩有差距;女子优秀铅球运动员身高体大,且符合力量型技术风格,是今后中国女子铅球运动发展的基本趋势及选材参照。通过对中外女子铅球发展态势分析,寻找制约中国女子铅球发展中存在的主要问题,以期对中国女子铅球的发展提供客观依据。 相似文献
10.
《体育科技文献通报》2002,(6)
G824.1 20022776我国优秀女子铅球运动员背向滑步推铅球技术动作速度节奏的特征与模式研究[刊,中,A]/肖林鹏//天津体育学院学报.-2002.-17(1).-30-32图2表5参8(LF)女子//背向滑步//铅球//速度//节奏//技术以我国国际健将级女子铅球运动员为研究对象,采用高速摄影及解析、生物力学分析等方法,对女子铅球运动员背向滑步推铅球技术动作相关运动环节的速度节奏与铅球出手初速度之间的关系进行了研究,并通过数学方法建立模型,以探讨我国优秀女子铅球运动员正确运用背向滑步推铅球技术 相似文献
11.
A. P. Hollander G. de Groot G. J. van Ingen Schenau H. M. Toussaint H. de Best W. Peeters 《Journal of sports sciences》2013,31(1):21-30
In order to measure active drag during front crawl swimming a system has been designed, built and tested. A tube (23 m long) with grips is fixed under the water surface and the swimmer crawls on this. At one end of the tube, a force transducer is attached to the wall of the swimming pool. It measures the momentary effective propulsive forces of the hands. During the measurements the subjects’ legs are fixed together and supported by a buoy. After filtering and digitizing the electrical force signal, the mean propulsive force over one lane at constant speeds (ranging from about 1 to 2 m s‐1) was calculated. The regression equation of the force on the speed turned out to be almost quadratic. At a mean speed of 1.55 m s‐1 the mean force was 66.3 N. The accuracy of this force measured on one subject at different days was 4.1 N. The observed force, which is equal to the mean drag force, fits remarkably well with passive drag force values as well as with values calculated for propulsive forces during actual swimming reported in the literature. The use of the system does not interfere to any large extent with normal front crawl swimming; this conclusion is based on results of observations of film by skilled swim coaches. It was concluded that the system provides a good method of studying active drag and its relation to anthropometric variables and swimming technique. 相似文献
12.
Koji Murofushi Shinji Sakurai Koji Umegaki Junji Takamatsu 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(3):301-314
Ground reaction force and wire tensile force were measured during test throws by three hammer throwers: the Asian record holder, who had a personal best of 83.47 m at the time of the investigation, and two university athletes, with personal bests of 59.95 m and 46.30 m respectively. They were filmed using three high-speed video cameras (250 Hz). The displacements of the hammer head and the athletes' centres of mass were calculated using three-dimensional analysis procedures. The Asian record holder's centre of mass and the hammer head on the final two turns exhibited approximate conjunctions of the hammer high point and the thrower's low point and vice versa about the hammer's azimuth angle. It is conjectured that the reason why the thrower's movement is asynchronous with the hammer's movement by approximately half a turn is to accelerate the hammer head in a manner similar to the way that the amplitude of a pendulum increases when it is pulled upward by a string against the downward movement of the swinging weight. 相似文献
13.
The purpose of this study was the experimental validation of the OpenGo sensor insole system compared to PedarX sensor insole and AMTI force-plate systems. Sixteen healthy participants performed trials in walking, running, jumping (drop and counter movement jumps), imitation drills and balance, with simultaneous measures of all three systems. Detected ground contact and flight times with OpenGo during walking, running and jumping were similar to those of AMTI. Force–time curves revealed comparable shapes between all three systems. Force impulses were 13–34% lower with OpenGo when compared to AMTI. Despite differences in mean values in some exercise modes, correlations towards AMTI were between r = 0.8 and r = 1.0 in most situations. During fast motions, with high force and impact, OpenGo provided lower force and latency in force kinetics. During balance tasks, discrepancy in the centre of pressure was found medio-lateral, while anterio–posterior direction was closer to AMTI. With awareness of these limitations, OpenGo can be applied in both clinical and research settings to evaluate temporal, force and balance parameters during different types of motion. The fully mobile OpenGo system allows for the easy and quick system application, analysis and feedback under complex field conditions, as well. 相似文献
14.
文章从劲力对于技击和武术健身的作用两个方面阐述了劲力对于武术运动的重要性,并从系统论的角度分析了劲力质量与武术健身效果之间的关系,认为劲力的质量越高,武术对于人体的健身效果就越明显。 相似文献
15.
Rafael Soncin Bruno Mezêncio Jacielle Carolina Ferreira Sara Andrade Rodrigues Rudolf Huebner Julio Cerca Serrão 《Sports biomechanics / International Society of Biomechanics in Sports》2017,16(2):248-257
The aim of this study was to propose a new force parameter, associated with swimmers’ technique and performance. Twelve swimmers performed five repetitions of 25 m sprint crawl and a tethered swimming test with maximal effort. The parameters calculated were: the mean swimming velocity for crawl sprint, the mean propulsive force of the tethered swimming test as well as an oscillation parameter calculated from force fluctuation. The oscillation parameter evaluates the force variation around the mean force during the tethered test as a measure of swimming technique. Two parameters showed significant correlations with swimming velocity: the mean force during the tethered swimming (r = 0.85) and the product of the mean force square root and the oscillation (r = 0.86). However, the intercept coefficient was significantly different from zero only for the mean force, suggesting that although the correlation coefficient of the parameters was similar, part of the mean velocity magnitude that was not associated with the mean force was associated with the product of the mean force square root and the oscillation. Thus, force fluctuation during tethered swimming can be used as a quantitative index of swimmers’ technique. 相似文献
16.
青少年女性穿不同鞋行走时足底压力分布研究 总被引：8，自引：0，他引：8
通过F—scan足底压力分布解析系统对青少年女性穿不同类型鞋行走时的步态进行足底压力分布的测量和分析。结果表明，青少年女性穿跟高6．5cm以上的高跟鞋行走时，足底第1跖趾关节最大受力值是穿球鞋行走时该点最大受力值的4倍，是穿中跟鞋和松糕鞋行走时该点最大受力值的2倍。穿松糕鞋行走时，足底3点压力变化曲线图与裸足行走时足底3点压力变化曲线图相似，但是，穿松糕鞋行走时，足底3点最大受力值比裸足行走时足底3点最大受力值大。因此。也说明穿松糕鞋行走时下肢肌肉负荷较大。提示，穿高跟鞋行走对青少年女性足的生长发育有严重影响，建议他们日常生活中少穿或者不穿高跟鞋。 相似文献
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Johanna S. Rosén Anton Arndt Victoria L. Goosey-Tolfrey Barry S. Mason Michael J. Hutchinson Olga Tarassova 《Journal of sports sciences》2013,31(17):1942-1950
ABSTRACTPara Va’a is a new Paralympic sport in which athletes with trunk and/or leg impairment compete over 200 m. The purpose of this study was to examine the impact of impairment on kinematic and kinetic variables during Va’a ergometer paddling. Ten able-bodied and 44 Para Va’a athletes with impairments affecting: trunk and legs (TL), legs bilaterally (BL) or leg unilaterally (UL) participated. Differences in stroke frequency, mean paddling force, and joint angles and correlation of the joint angles with paddling force were examined. Able-bodied demonstrated significantly greater paddling force as well as knee and ankle flexion ranges of movement (ROM) on the top hand paddling side compared to TL, BL and UL. Able-bodied, BL and UL demonstrated greater paddling force and trunk flexion compared to TL, and UL demonstrated larger bottom hand paddling side knee and ankle flexion ROM compared to BL. Significant positive correlations were observed for both male and female athletes between paddling force and all trunk flexion angles and ROM in the trunk and pelvis rotation and bottom hand paddling side hip, knee and ankle flexion. The results of this study are important for creating an evidence-based classification system for Para Va’a. 相似文献
19.
All those who compete in the sport of rowing have used the land rowing machine, Ergometer (commonly called the ‘erg’), manufactured
by Concept II (Morrisville, Vermont, USA). Ergon is the Greek word for work, hence the Ergometer measures work. Rowers are
commonly ranked according to their ‘erg score.’ The fault in this ranking is that the land Ergometer cannot account for many
of the important technical aspects associated with rowing on the water. The goals of this project were to (1) develop a system
for on-the-water measurement of work during rowing and then (2) demonstrate the potential of such a system to quantify performance
and improve rowing technique. To achieve these goals, force was measured using strain gauges glued to the shaft of the rowing
oar and angular displacement was measured using a potentiometer. The force and displacement measurements were sent to a microcontroller,
which calculated the total work done in a particular stroke, as well as other parameters, and displayed the values to the
rower. The parameters were used to evaluate the performance of three collegiate rowers on the water. The data were also used
to plot force profiles, which were reviewed with each rower and the coach to illustrate the rowers’ habits and facilitate
improving technique. One rower was ‘tutored’ with the device through five on-the-water practices, after which his force profiles
and parameter values demonstrated significant improvement. The device not only provided a standard to which all rowers were
compared on the water, but also supplied the rowers with important information on technical aspects of their strokes and pacing
themselves. 相似文献
20.
广东田径后备人才可持续发展影响因素的研究 总被引：11，自引：1，他引：10
采用访问调查、问卷调查、个案分析和数理统计等方法,从社会学角度,分析田径后备人才培养的现状及存在问题,并探讨影响其可持续发展的因素,旨在促进广东田径运动可持续发展。研究认为:广东田径传统优势项目是短、跨、跳;后备人才成萎缩趋势,人才的选拔体系尚需完善;三线教练员人数偏少,训练科学化程度亟待提高;竞赛表现为模式成人化,记分、奖励制度需进一步调整;后备人才培养的经费不足;影响广东后备人才可持续发展的因素可归纳为八个,其中政策导向因子影响最大。 相似文献