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1.
木球运动的起源与发展 总被引：1，自引：0，他引：1
运用文献资料法等研究方法,阐述木球运动的起源以及球场、球具、基本技术、比赛方法,对木球运动的推广与发展前景进行探讨,认为木球运动是一项集健身、休闲、竞技、娱乐为一体,适合社会各个阶层不同年龄、不同性别的人士参加的新兴运动项目,具有广阔的发展前景. 相似文献
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对木球教学的几点思考 总被引：2，自引：0，他引：2
王晓青 《体育健康知识画刊》2006,(2)
本文从木球运动产生、推广的背景以及木球的基本技术,实践技术特点,木球运动的特点等方面进行了分析,并提出了在具体教学中应该注意的一些问题。 相似文献
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文章通过问卷调查法、文献资料法、数理统计法等方法对北京语言大学、临沂大学、海南大学、临沂职业学院、商丘师范学院等十所高等院校的木球参与者开展了一系列的调查,对高校木球发展的现状进行调查与研究,进一步了解了高等院校木球的发展情况,总结目前存在的优点以及开展过程中的不足之处。为促进高等院校木球运动的文化建设,探索出一条真正适合高等院校木球的发展之路,为今后高等院校木球的发展提出切实可行的策略:深化教材改革,加强师资力量;丰富木球活动与教学内容;改善木球场地器材设施;增强学校领导对木球运动的重视程度。 相似文献
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木球对于大多数人来讲是一项比较陌生的运动。90年代初,由现任中华台北木球协会会长翁明辉先生构思和始创,由于该项运动的娱乐性、休闲性和健身价值,很快在祖国宝岛开展,继而推广到大陆和东南亚地区。近几年,在翁先生亲自 相似文献
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本文运用文献资料、数理统计法对2015-2021年“甬台木球锦标赛”共计6届，前8名杆数成绩进行研究。结果发现，在木球竞技运动中，性别对木球竞技的总杆数成绩影响较小，但是年龄对木球的竞技成绩影响比较大，尤其18-50岁年龄段是木球竞技水平发展的黄金期。然而，年龄对木球竞技运动各个赛道成绩影响各有差异，主要表现在短距离赛道上具有显著性差异（p<0.05），年龄越大成绩越好；而在长距离赛道上不显著（p>0.05），主要表现在距离越长的赛道，成绩也越不稳定。因此，不同赛道长度对参赛队员的杆数成绩影响比较大，距离越长所用的杆数就越多，与总杆数成绩相关性就越大（R=0.628、0.828、0.633且p<0.05）。距离越短的赛道与总杆数成绩相关系数就越小（R=0.471、0.408、0.427且p<0.05）。 相似文献
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金安铭 《哈尔滨体育学院学报》2008,26(1):60-61
从哈尔滨市休闲体育的特点进行分析,主要是以冰雪运动为主的现代休闲运动方式进行研究,从哈尔滨市冰雪休闲运动特点和现状入手,为哈尔滨市休闲体育健康、快速的可持续发展提供参考。 相似文献
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女性主义视角下的休闲运动 总被引：13，自引：0，他引：13
随着休闲运动的日益发展，女性休闲运动也越来越受到社会的关注。本文从女性主义的概念以及女性主义与休闲运动对女性的影响，剖析了女性主义的休闲运动观、女性休闲运动发展现状、开展休闲运动对女性的益处以及影响女性休闲运动的因素等方面，说明了休闲运动不仅仅是男性的权利而且是女性的权利。从而为女性休闲运动的发展提供了一定的理论依据。 相似文献
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Timing of ball release in overarm throws affects ball speed in unskilled but not skilled individuals
We tested the hypothesis that variability in the timing of ball release in overarm throws affects ball speed. Nine unskilled and six skilled throwers made 30 throws fast and accurately from a sitting and standing position. Angular positions of finger and arm segments were recorded with search-coils at 1000 Hz; ball speed was measured with a radar gun. The time of ball release from the fingertips was measured with respect to seven arm kinematic reference points. Mean timing windows for ball release were 28?ms for unskilled throwers and 7?ms for skilled throwers. Mixed-model analyses of variance showed that a there was a statistically significant relationship between ball speed and the timing of ball release in unskilled throwers, but not in skilled throwers. This was presumably due to the difference in variability of the timing of ball release between the two groups. In contrast, skilled throwers showed a relationship between ball speed and peak forearm angular velocity (one measure of arm speed). We conclude that although variability in the timing of ball release can affect ball speed, this is only a major factor in unskilled throwers. When skilled throwers throw fast, variability in ball speed is due to variability in arm speed. 相似文献
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Timing of ball release in overarm throws affects ball speed in unskilled but not skilled individuals
We tested the hypothesis that variability in the timing of ball release in overarm throws affects ball speed. Nine unskilled and six skilled throwers made 30 throws fast and accurately from a sitting and standing position. Angular positions of finger and arm segments were recorded with search-coils at 1000 Hz; ball speed was measured with a radar gun. The time of ball release from the fingertips was measured with respect to seven arm kinematic reference points. Mean timing windows for ball release were 28 ms for unskilled throwers and 7 ms for skilled throwers. Mixed-model analyses of variance showed that a there was a statistically significant relationship between ball speed and the timing of ball release in unskilled throwers, but not in skilled throwers. This was presumably due to the difference in variability of the timing of ball release between the two groups. In contrast, skilled throwers showed a relationship between ball speed and peak forearm angular velocity (one measure of arm speed). We conclude that although variability in the timing of ball release can affect ball speed, this is only a major factor in unskilled throwers. When skilled throwers throw fast, variability in ball speed is due to variability in arm speed. 相似文献
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Measurements are presented of the friction force acting on a tennis ball incident obliquely on the strings of a tennis racket.
This information, when combined with measurements of ball speed and spin, reveals details of the bounce process that have
not previously been observed and also provides the first measurements of the coefficient of sliding friction between a tennis
ball and the strings of a tennis racket. At angles of incidence less than about 40° to the string plane, the ball slides across
the strings during the whole bounce period. More commonly, the ball is incident at larger angles in which case the ball slides
across the string plane for a short distance before gripping the strings. While the bottom of the ball remains at rest on
the strings, the remainder of the ball continues to rotate for a short period, after which the ball suddenly releases its
grip and the bottom of the ball slides backwards on the string plane. The bounce angle depends mainly on the angle of incidence
and the rotation speed of the incident ball. Differences in bounce angle and spin off head-clamped and hand-held rackets are
also described. 相似文献
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Takahito Iga Hiroyuki Nunome Shinya Sano Nahoko Sato Yasuo Ikegami 《Sports biomechanics / International Society of Biomechanics in Sports》2018,17(4):477-493
To assess ball impact force during soccer kicking is important to quantify from both performance and chronic injury prevention perspectives. We aimed to verify the appropriateness of previous models used to estimate ball impact force and to propose an improved model to better capture the time history of ball impact force. A soccer ball was fired directly onto a force platform (10 kHz) at five realistic kicking ball velocities and ball behaviour was captured by a high-speed camera (5,000 Hz). The time history of ball impact force was estimated using three existing models and two new models. A new mathematical model that took into account a rapid change in ball surface area and heterogeneous ball deformation showed a distinctive advantage to estimate the peak forces and its occurrence times and to reproduce time history of ball impact forces more precisely, thereby reinforcing the possible mechanics of ‘footballer’s ankle’. Ball impact time was also systematically shortened when ball velocity increases in contrast to practical understanding for producing faster ball velocity, however, the aspect of ball contact time must be considered carefully from practical point of view. 相似文献
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There are several ways of carrying the ball in rugby union, which could influence the speed at which a player can run. We assessed 52 rugby players (34 males, 18 females) during a maximum sprint over 30 m without the ball, with the ball under one arm, and with the ball in both hands. Timing gates were used to measure time over the initial 10 m and the last 20 m. It has previously been reported (Grant et al., 2003) that running with the ball produces a slower sprinting speed than running without the ball. We hypothesized that the decrease in speed caused by carrying the ball would become less marked with the experience of the player. The male and female players were each divided into two groups: a "beginner" group that consisted of players in their first or second season and an "experienced" group that was composed of players who had played for more than two seasons. A 2 x 3 mixed-model analysis of variance was used to identify differences (P < 0.01) between the beginner and experienced groups in the three sprinting conditions. The times for the males for the first 10 m sprints without the ball, with the ball under one arm, and with the ball in both hands were 1.87 +/- 0.08 s, 1.87 +/- 0.08 s, and 1.91 +/- 0.1 s for the beginners, and 1.87 +/- 0.1, 1.88 +/- 0.1 and 1.88 +/- 0.12 for the more experienced players respectively. The times for the females for the first 10 m without the ball, with the ball under one arm, and with the ball in both hands were 2.13 +/- 0.16 s, 2.19 +/- 0.17 s, and 2.20 +/- 0.16 s for the beginners, and 2.03 +/- 0.12 s, 2.03 +/- 0.09 s, and 2.04 +/- 0.1 s for the more experienced players respectively. For the last 20 m of the 30-m sprint, there were differences between the different sprint conditions (P < 0.001) but no differences that were attributable to experience (P = 0.297). The times for the males over the last 20 m without the ball, with the ball under one arm, and with the ball in both hands were 2.58 +/- 0.19 s, 2.61 +/- 0.12 s, and 2.65 +/- 0.12 s for the beginners, and 2.59 +/- 0.12, 2.62 +/- 0.23, and 2.65 +/- 0.18 s for the more experienced players respectively. The times for the females over the last 20 m without the ball, with the ball under one arm, and with the ball in both hands were 3.25 +/- 0.38 s, 3.35 +/- 0.42 s, and 3.40 +/- 0.46 s for the beginners, and 3.04 +/- 0.32 s, 3.06 +/- 0.22 s, and 3.13 +/- 0.27 s for the more experienced players respectively. No gender-specific differences were detected. The results of this study suggest that practising sprints while carrying a ball benefits the early phase of sprinting while carrying the ball. 相似文献
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对第18届世界杯足球赛16强的16场比赛的铲球技术进行统计分析,探讨高水平球队铲球技术运用的规律。结果显示,随着比赛的进行,铲球次数递减,提高体能储备,才能保证在全场的强对抗中有充沛的体能进行抢截,保证铲球动作的合理性和准确性。后卫、前卫球员讲究铲球的准确性和有效性,前锋球员追求抢点铲射的意识和铲球技巧。提高正面铲球的成功率,方能减少铲球犯规而给对方制造机会。 相似文献
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In this study, we develop a finite element model to examine the oblique soccer ball bounce. A careful simulation of the interaction between the ball membrane and air pressure in the ball makes the model more realistic than analytical models, and helps us to conduct an accurate study on the effect of different parameters on a bouncing ball. This finite element model includes a surface-based fluid cavity to model the mechanical response between the ball carcass and the internal air of the ball. An experimental set-up was devised to study the bounce of the ball in game-relevant impact conditions. Ball speed, angle, and spin were measured before and after the bounce, as well as ball deformation and the forces during the impact. The finite element model has been validated with three different sets of data, and the results demonstrate that the finite element model reported here is a valuable tool for the study of ball bounce. After validation of the model, the effect of the friction coefficient on soccer ball bounce was studied numerically. Simulation results show that increasing the friction coefficient may result in reversal of the horizontal impact force. 相似文献
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练习实心球的投掷是进行体育锻炼和提高体育素质的好方法之一。实心球投投掷也是体育训练达标的五项内容之一。所以文中设计了三种实心球投掷的强制训练方法。从这种达标训练方法的实验结果中我们可以分析最有利和最合理的实心球训练的本质内容,从而来提高投掷实心球的教学和提高检测实心球达标的水平。 相似文献
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本文讲解了果岭边沙坑球基本技术:从球位、站姿、杆面、提倡“V”型挥杆进行了分析。例举了果岭边沙坑球功能性训练方法:1.架球梯(避免翻手腕动作)训练;2.沙坑画线(入沙点精准)训练;3.爆炸式(利用反弹角)训练。针对下坡沙坑球、上坡沙坑球、人高球低沙坑球、人低球高沙坑球、球陷入沙坑(荷包蛋)四种特殊果岭边的沙坑球进行了详细的技术分析。 相似文献
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In recent years, variability in behaviour of the sliotar, a small leather-bound ball used in the Irish sport of hurling, has become evident in championship matches. The inconsistency in performance was attributed to the range of constructions and material compositions of currently approved ball types. With a view to adopting a standard core, a new methodology has been commissioned to assess the dynamic impact behaviour of approved sliotar cores. In this paper, the relationship between the dynamic stiffness and the coefficient of restitution is presented with regard to material properties, ball construction and viscoelastic strain and strain-rate dependencies. The modern polymer ball types were shown to exhibit strain-rate sensitivity, while the performance of the traditional multi-compositional ball types exhibited lesser strain-rate dependence. The traditional balls types were shown to be up to 2.5 times stiffer than the modern ball types, with this finding having implications for ball energy dissipation. 相似文献