40mm乒乓球和11分制对比赛和正手拉球的影响

分析研究40mm乒乓球和11分制对比赛和正手拉球的影响，找出适应大球和新赛制的训练方法，为乒乓球训练提供参考和借鉴。     

40mm乒乓球击球部位新解

40mm乒乓球大球，由于球体加大，球速减慢，旋转减弱，使乒乓球运动更具群盘性、广泛性，众多而普用的乒乓球人口继续为乒乓球运动、为实行全民健身纲要作贡献。如何适应和较快掌握乒乓球大球的运行与击球规律，本文在40mm乒乓球球体击球部位方面进行了探讨和研究。     

40mm乒乓球和11分制对比赛和正手拉球的影响

分析研究了40mm乒乓球和11分制对比赛和正手拉球的影响，进而找出适应大球和新赛制的训练方法，为乒乓球运动员和教练员们在训练时提供参考和借鉴。     

新时期乒乓球竞赛规则的改革和发展

新时期国际乒联对竞赛规则的改革及其对乒乓球运动项目发展的影响 进入新世纪,国际乒联关于乒乓球规则、规程、赛制、甚至包括器材方面的改革持续不断。2000年10月1日国际乒联规定：乒乓球直径由原来的38mm改为40mm,从此乒乓球运动进入了大球时代;     

浅析40 mm大球对乒乓球运动的影响

采用文献资料和访谈研究方法，归纳并阐明了大球对乒乓球运动员技、战术水平、身体素质以及乒乓球器材等方面所产生的影响和变化。     

乒乓球改大球后技术动作和打法的变化

38mm乒乓球改为40mm乒乓球,使乒乓球在运行中的速度、旋转、反弹角度等发生了相应的变化,增加了击球回合次数,提高了乒乓球运动的观赏性,同时也给乒乓球运动的技术动作和打法带来了新的挑战。必须了解各种变化,调整技术动作,才能更好地掌握乒乓球技术,提高运动技术水平。     

我国残疾人乒乓球国家队运动员赛前情绪分析

对我国残疾人乒乓球国家队运动员的焦虑程度、自信心进行测查分析.结果表明:男残疾人乒乓球运动员的平均焦虑水平略高于女残疾人乒乓球运动员,而平均自信心水平也较高于女残疾人乒乓球运动员;冠军运动员与非冠军运动员平均焦虑水平相差不大,但自信心水平较低;男残疾乒乓球冠军运动员的平均焦虑水平与女残疾乒乓球冠军运动员相差不大,而平均自信心水平略高于女残疾乒乓球冠军运动员;不同性别、不同残疾类别的乒乓球残疾运动员的焦虑程度、自信心略有差异,对残疾人乒乓球运动员的焦虑、自信心均无显著影响;年龄、训练年限特征对残疾人乒乓球运动员的焦虑程度、自信心无显著影响;组别、是否冠军特征对残疾人乒乓球运动员的焦虑程度、自信心无显著影响;我国残疾人乒乓球国家队队员的焦虑水平略低于甲D联赛运动员,运动自信心水平却比甲D联赛运动员略高,但差异不明显.     

测定乒乓球运动员扣杀挥拍速度的简易方法

在现代乒乓球技术中，特别是改用40mm大球的今天，不断加快挥拍的速度，增大击球力量是提高竞技水平的重要途径之一。然而，要测定乒乓球运动员极快的挥拍速度，必须使用高速摄影等特殊手段，一般很难完成。为寻求一种简便易行的办法，我们对击球瞬间挥拍速度与被击出的球飞出距离的关系进行了实验研究。结果发现，挥拍速度与球的飞出距离两变量间存在显著的相关关系。在使用40mm乒乓球的情况下，相关系数男子为0．881(P(0．01)，女子为0．889(P(0．01)。用测量扣杀时球飞出距离来推算击球瞬间的挥拍速度，作为一种简便方法是可行的。     

河北省少年乒乓球教练员现状分析

采用访谈法、问卷调查法和数理统计法,对河北省43名少年乒乓球教练员进行研究分析,表明教练员训练科学化水平较低,影响了河北省乒乓球运动的持续发展,加强少年乒乓球教练员队伍建设至关重要。     

规则催化剂

满眼青涩的橙子中．唯有正中央一只黄橙橙地艳丽夺目．上面印着“双鱼”的40mm三星大球标记．上方印着“40mm出类拔萃”。这则广告．既喻意着双鱼40mm乒乓球已通过国际乒联检测、符合其最新标准，也预示着乒乓球用品行业即将迎来“大球”的丰收时节。     

40 mm 乒乓球对比赛状态的影响

运用调研法对参加１９９８年中国苏州国际乒联大球比赛的运动员、国际乒联执委会委员和部分观众进行调查。调查内容包括：球的速度、旋转、回合数、对大球的态度以及乒乓球改革的看法。文章对调查结果进行了讨论。     

大球对乒乓球比赛的影响及对策

大球的采用使得乒乓球比赛的对抗更加激烈、精彩。由于球体的增大 ,造成了球速减慢、旋转减弱、回合球增多等一系列的变化 ,从而大大增强了乒乓球比赛的观赏性 ,同时也在训练方法、手段、技战术等方面对教练员和运动员提出了新的要求。对这一系列的变化因素进行分析 ,并在应如何适应大球的相关对策上进行初步的探讨     

关于大球对高水平男子横拍弧圈类打法运动员技术影响的研究

为了使国球的长盛不衰,掌握大球的基本规律,笔者采用文献资料、调查访问、观察统计、数理统计、对比分析等研究方法,并通过对他们在大小球时代录像统计中的发球进行对比分析,为乒乓球教练员、运动员的训练、比赛提供参考依据。     

The relationship between the golf swing plane and ball impact characteristics using trajectory ellipse fitting

The trajectory of the clubhead close to ball impact during the golf swing has previously been shown to be planar. However, the relationship between the plane orientation and the orientation characteristics of the clubhead at ball impact has yet to be defined. Fifty-two male golfers (27 high skilled, 25 intermediate skilled) hit 40 drives each in an indoor biomechanics laboratory. This study successfully fitted the trajectory of the clubhead near impact to an ellipse for each swing for players of different skill levels to help better explain this relationship. Additionally, the eccentricities of the ellipses were investigated for links to skill level. The trajectory of the clubhead was found to fit to an ellipse with RMSE of 1.2 mm. The eccentricity of the ellipse was found to be greater in the high-skilled golfers. The club path and angle of attack generated from the ellipse fitted clubhead trajectory were found to have a normalised bias-corrected RMSE of 2% and 3%, respectively. A set of “rule of thumb” values for the relationship between the club path, angle of attack and delivery plane angle was generated for use by coaches.     

对新型乒乓球性能的计算与研究

据国际乒联透露,为提高乒乓球的观赏性,吸引群众,将把现用乒乓球的直径由３８毫米改为４０毫米,被称为“新型球”或“大球”,并将在１９９７年第４４届世乒赛期间举行一次实验性的大球比赛。为了解大球的性能,探索其可行性,以尽快掌握其运动规律,对大球的参数和性能进行了计算与分析。如果制作大球的材料与小球的相同,计算结果：大球的质量增加０．２７１７克,材料体积增加０．１８８４厘米３,球的体积增大４．７８１厘米３,绕通过质心额状轴为转动惯量增加１．３９１立方厘米。如果用大球比赛,以与击小球同样的方式和大小相等的力来打击大球,大球的转速将比小球减少９．４１转／秒（约减少１／５）,速度减慢４．１４米／秒（约减少１／１０）,但大球的性能发生了明显的变化。     

The importance and development of ball control and (self-reported) self-regulatory skills in basketball players for different positions

This study first investigated the importance of ball control and (self-reported) self-regulatory skills in achieving the elite level in basketball. The second aim was to gain insight into the development of, and association between ball control and (self-reported) self-regulatory skills that contribute to achieving the elite level, with taking into account positional differences. Talented male players (N = 73; age 16.56 ± 1.96) completed the STARtest to measure ball control and a questionnaire to measure (self-reported) self-regulation from 2008–2012. Results showed that (self-reported) reflective skills were most important to achieve the elite level (OR = 11.76; P < 0.05). There was no significant improvement in (self-reported) reflection over time for guards, forwards, and centers. Improvement in ball control was evident for guards (r = ?0.65; P < 0.05). Furthermore, guards and forwards had better ball control compared to centers (P < 0.01). For those two positions, negative correlations were found between (self-reported) reflection and ball control, i.e., higher reflection was related to better ball control (guards r = ?0.19; forwards r = ?0.18) in contrast to centers (r = 0.34). It is concluded that (self-reported) reflective skills are important to achieve the elite level, while ball control seems especially important for guards.     

Anthropometric and kinematic influences on release speed in men's fast-medium bowling

The main aim of this study was to identify significant relationships between selected anthropometric and kinematic variables and ball release speed. Nine collegiate fast-medium bowlers (mean +/- s: age 21.0 +/- 0.9 years, body mass 77.2 +/- 8.1 kg, height 1.83 +/- 0.1 m) were filmed and reconstructed three-dimensionally. Ball release speeds were measured by a previously validated Speedchek Personal Sports Radar (Tribar Industries, Canada). Relationships between selected anthropometric variables and ball release speed and between kinematic variables and ball release speed were investigated using Pearson's product-moment correlation coefficients (r). A significant relationship was found between the horizontal velocity during the pre-delivery stride (r = 0.728, P < 0.05) and ball release speed (31.5 +/- 1.9 m(-1) s(-1)). We believe that the high correlation was due to the bowlers using techniques that allowed them to contribute more of the horizontal velocity created during the run-up to ball release speed. We also found that the angular velocity (40.6 +/- 3.4 rad x s(-1)) of the right humerus had a low correlation (r = 0.358, P > 0.05) with ball release speed. Although the action of the wrist was not analysed because of an inadequate frame rate, we found high correlations between ball release speed and shoulder-wrist length (661 +/- 31 mm; r = 0.626, P < 0.05) and ball release speed and total arm length (860 +/- 36 mm; r = 0.583, P < 0.05). We conclude that the variance in release speed within this group may be accounted for by the difference in radial length between the axis of rotation at the glenohumeral joint and the release point.