共查询到20条相似文献，搜索用时 234 毫秒
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球博士： 我从《乒乓世界》杂志上了解到邱钟惠公司出售乒乓球发球机,有几个问题请给予回答：１．在何处能购买到发球机？２．一台发球机的单价是多少？３．火车托运的费用怎样计算？４发球机的动力有多大？５．怎样办理邮购手续？ 云南 王智金对于这些问题,邱钟惠公司答复如下：此发球机为美国专利,台湾制造,北京邱钟惠体育用品公司是中国的总代理。价格：２０００型发球机６５００元／台２１０００型发球机３２００元／台。２０００型自带乒乓球回收系统,１０００型则没有。这两种型号的发球机耗电量均为１８瓦,用标准市电即可… 相似文献
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王樱桃 《体育科技文献通报》2011,19(12):38-40
本研究构建了＂多球-发球机＂组合练习法教学程序,并在乒乓球教学中采用了此教学程序进行实验研究,收到良好效果。研究结果经T检验和综合态度系数F定量分析表明：该组合练习法有利于提高乒乓球技能,对学生学习也产生了积极主动的兴趣,且与一般的练习方法相比在乒乓球达标与技评具有显著性差异（P〈0.01）。 相似文献
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近年来,多球训练法在乒乓球训练中展现出许多优势,因此,越来越多的高职院校开始将多球训练法运用到乒乓球训练课堂中,以提升学生的乒乓球专业技术能力。本文简要地介绍了多球训练法的训练方式,采用文献资料法、专家访谈法、行动研究法、实地调查法,以乒乓球教学中多球训练法的应用为研究对象,对多球训练法在高职院校的乒乓球课程中的运用进行详细的阐述,旨在丰富乒乓球教学方法,提高高职院校乒乓球教学效率。 相似文献
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运用特定比赛、多球计分、三维图像解析等方法对40名乒乓球运动员正手攻球的比赛成绩、成功率与准确度进行实验测量,深入分析多球训练法与传统训练法对提高乒乓球运动员攻球技术稳定性的作用和效果,旨在为提高乒乓球攻球技术的稳定性提供参考和借鉴. 相似文献
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运用调查法、观察法、统计法、文献综述法对河南省中牟乒乓球馆不同多球训练密度对少儿乒乓球运动员的影响进行分析。结果显示：多球训练的密度过大对少儿运动员生理心理方面产生很大的副作用，严重脱离了少儿身心发展特点；密度过小，体现不出多球训练的作用。因此适宜训练密度对少儿乒乓球运动员有着非常重要的意义。 相似文献
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乒乓球多球训练是通过连续送不同落点、旋转和力量的球,可以加大训练的密度和强度,提高训练效果,很多优秀运动队采用此方法。上海市少儿乒乓球业余训练,也经常采用多球训 练，但如何合理地安排多球训练，科学掌握其运用时机，合适的负荷强度，是需要研究的课题。 相似文献
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乒乓球发球机在区域练习法中的设计与应用研究 总被引：1，自引：0，他引：1
在区域练习法中,运用发球机将乒乓球的基本技术有机组合成若干个组合练习形式,按重新设计的教学进度和计划进行教学。通过实验组与对照组的教学效果对比研究表明：采用发球机进行教学,符合大学生的心理特点,不仅可以提高大学生的学习兴趣、单位时间内练习的密度、强度,而且对掌握基本技、战术,落点的准确性,实战能力等方面明显优于常规教法。教法设计简单、新颖、实用。 相似文献
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David Klemish Benjamin Ramger Kelly Vittetoe Jerome P. Reiter Surya T. Tokdar 《Journal of sports sciences》2018,36(2):171-179
This study aimed to evaluate the possibility that differences in sensorimotor abilities exist between hitters and pitchers in a large cohort of baseball players of varying levels of experience. Secondary data analysis was performed on 9 sensorimotor tasks comprising the Nike Sensory Station assessment battery. Bayesian hierarchical regression modelling was applied to test for differences between pitchers and hitters in data from 566 baseball players (112 high school, 85 college, 369 professional) collected at 20 testing centres. Explanatory variables including height, handedness, eye dominance, concussion history, and player position were modelled along with age curves using basis regression splines. Regression analyses revealed better performance for hitters relative to pitchers at the professional level in the visual clarity and depth perception tasks, but these differences did not exist at the high school or college levels. No significant differences were observed in the other 7 measures of sensorimotor capabilities included in the test battery, and no systematic biases were found between the testing centres. These findings, indicating that professional-level hitters have better visual acuity and depth perception than professional-level pitchers, affirm the notion that highly experienced athletes have differing perceptual skills. Findings are discussed in relation to deliberate practice theory. 相似文献
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Walter A. Laughlin Kyle T. Aune Alek Z. Diffendaffer 《Sports biomechanics / International Society of Biomechanics in Sports》2016,15(1):36-47
Swing trajectory and ground reaction forces (GRF) of 30 collegiate baseball batters hitting a pitched ball were compared between a standard bat, a bat with extra weight about its barrel, and a bat with extra weight in its handle. It was hypothesised that when compared to a standard bat, only a handle-weighted bat would produce equivalent bat kinematics. It was also hypothesised that hitters would not produce equivalent GRFs for each weighted bat, but would maintain equivalent timing when compared to a standard bat. Data were collected utilising a 500 Hz motion capture system and 1,000 Hz force plate system. Data between bats were considered equivalent when the 95% confidence interval of the difference was contained entirely within ±5% of the standard bat mean value. The handle-weighted bat had equivalent kinematics, whereas the barrel-weighted bat did not. Both weighted bats had equivalent peak GRF variables. Neither weighted bat maintained equivalence in the timing of bat kinematics and some peak GRFs. The ability to maintain swing kinematics with a handle-weighted bat may have implications for swing training and warm-up. However, altered timings of kinematics and kinetics require further research to understand the implications on returning to a conventionally weighted bat. 相似文献
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Ken Purcell 《Research quarterly for exercise and sport》2013,84(2):238-245
Abstract A tennis skill test for use in quantifying achievement in the forehand and backhand drive strokes was developed and then validated using 76 college women enrolled in beginning tennis classes. The test consisted of returning balls pitched by a pneumatic ball machine into target areas drawn in chalk on a regulation tennis court. Speed of the subjects' shots was assessed by measuring accumulated time in flight for rounds of 10 trials using a stopwatch. A time factor was then employed to correct the target value total for the trials to adjust for ball speed, thus rewarding the more skilled player who could stroke the ball more firmly while still retaining control. The test-retest reliability of the test was found to be .84, while the validity of the test, using judges' ratings as a criterion, was .83. It was concluded that the test was a valid and reliable test of skill which was closely related to the actual game situation. Percentile norms were developed on a limited number of subjects. 相似文献
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JOAN N. VICKERS LORI F. LIVINGSTON SHERI UMERIS-BOHNERT DEAN HOLDEN 《Journal of sports sciences》2013,31(5):357-367
Novice, intermediate and advanced baseball hitters followed a 7–week training programme, in which they received either behavioural training or decision training. Participants in the behavioural training group received simple-to-complex instruction, variable practice and an abundance of feedback throughout the acquisition period; the decision training group received complex instruction, variable practice and reduced delayed feedback. As predicted, the intermediate and advanced hitters who received decision training hit at a lower level (%) during acquisition but at a higher level during a transfer test in week 7. Novices in the behavioural training group were better than novices in the decision training group over both acquisition and transfer trials. 相似文献
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采用文献资料法和数理统计法,将中外男排优秀副攻选手的身体形态及场上作用进行对比分析。中国男排副攻队员在年龄、体重及克托莱指数方面均与世界优秀副攻选手存在非常显著性差异,且主动得分能力较低;建议我国尽快制定符合现代排球运动发展趋势的运动员选材模式和训练模式。 相似文献
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在对照实验的基础上对球感的机理进行了分析,并采用回归分析和判别分析的统计方法建立了测量和评价模式。研究结果表明：“球感”可作为乒乓球选材的重要指标,采用此评价模式测量“球感”所建立的判别函数式有显著性意义,符合率在６５％以上。 相似文献
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Novice, intermediate and advanced baseball hitters followed a 7-week training programme, in which they received either behavioural training or decision training. Participants in the behavioural training group received simple-to-complex instruction, variable practice and an abundance of feedback throughout the acquisition period; the decision training group received complex instruction, variable practice and reduced delayed feedback. As predicted, the intermediate and advanced hitters who received decision training hit at a lower level (%) during acquisition but at a higher level during a transfer test in week 7. Novices in the behavioural training group were better than novices in the decision training group over both acquisition and transfer trials. 相似文献
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The purpose of this study was to construct and evaluate the reliability of an apparatus for testing golf putters with respect to distance and direction deviation at different impact points on the clubface. An apparatus was constructed based on the pendulum principle that allowed putter golf clubs to swing at different speeds. The mean speed of the club head before ball impact, and of the ball after impact, was calculated from time measurements with photocells. A pin profile rig was used to determine the directional deviation of the golf ball. Three different putters were used in the study, two that are commercially available (toe-heel weighted and mallet types) and one specially made (wing-type) putter. The points of impact were the sweet spot (as indicated by the manufacturer's aim line), and 1, 2 and 3 cm to the left and right of the sweet spot. Calculation of club head speed before impact, and of ball speed after impact (proportional to distance), showed errors < or = 0.5% of interval duration. The variability in ball impacts was tested by measuring time and direction deviations during 50 impacts on the same ball. The mean duration (+/- s) after ball impact in the test interval (1.16 m long) was 206 (0.8) ms and the standard deviation in the perpendicular spreading of the balls in relation to the direction of the test interval was 0.005 m. A test-retest of one putter on two consecutive days after remounting of the putter on the test apparatus showed less than 1% difference in distance deviation. We conclude that the test apparatus enables a precise recording of distance and direction deviation in golf putters as well as comparisons between different putters. The apparatus and set-up can be used in the laboratory as well as outdoors on the putting green. 相似文献
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Daniel A. Hackett Timothy B. Davies Denis Ibel Stephen Cobley Ross Sanders 《Measurement in physical education and exercise science》2018,22(1):79-87
This study examined the predictive ability of the medicine ball chest throw and vertical jump for muscular strength and power in adolescents. One hundred and ninety adolescents participated in this study. Participants performed trials of the medicine ball chest throw and vertical jump, with vertical jump peak power calculated via an estimation equation. One-repetition maximum and peak power for the chest press and leg press were assessed using pneumatic exercise machines. The medicine ball chest throw strongly correlated with chest press one-repetition maximum and peak power, while the vertical jump peak power strongly correlated with leg press one-repetition maximum and peak power. The predictive ability of medicine ball chest throw was better than vertical jump peak power for muscular strength and power when controlling for sex, age, height, weight, and maturation, and was not affected by involvement in sports. Results show good predictive ability of the medicine ball chest throw for muscular strength and power in adolescents, while predictable ability of vertical jump peak power is weakened when other factors are taken into account. 相似文献