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21.
Charles A. J. Macaulay Pro Stergiou Darren Stefanyshyn Luciano Tomaghelli 《Journal of sports sciences》2017,35(23):2350-2356
Lacrosse requires the coordinated performance of many complex skills. One of these skills is shooting on the opponents’ net using one of three techniques: overhand, sidearm or underhand. The purpose of this study was to (i) determine which technique generated the highest ball velocity and greatest shot accuracy and (ii) identify kinematic and kinetic variables that contribute to a high velocity and high accuracy shot. Twelve elite male lacrosse players participated in this study. Kinematic data were sampled at 250 Hz, while two-dimensional force plates collected ground reaction force data (1000 Hz). Statistical analysis showed significantly greater ball velocity for the sidearm technique than overhand (P < 0.001) and underhand (P < 0.001) techniques. No statistical difference was found for shot accuracy (P > 0.05). Kinematic and kinetic variables were not significantly correlated to shot accuracy or velocity across all shot types; however, when analysed independently, the lead foot horizontal impulse showed a negative correlation with underhand ball velocity (P = 0.042). This study identifies the technique with the highest ball velocity, defines kinematic and kinetic predictors related to ball velocity and provides information to coaches and athletes concerned with improving lacrosse shot performance. 相似文献
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Jan Wilke Daniel Niederer Lutz Vogt Winfried Banzer 《Journal of sports sciences》2016,34(22):2145-2148
The skeletal muscles and the fibrous connective tissue form an extensive, body-wide network of myofascial chains. As fascia can modify its stiffness, strain transmission along these meridians is supposable. The goal of this trial therefore was to collect pilot data for potential remote effects of lower limb stretching on cervical range of motion (ROM). Twenty-six healthy participants (30 ± 6 years) were included in the matched-pairs intervention study. One group (n = 13) performed three 30 s bouts of static stretching for the gastrocnemius and the hamstrings, respectively. An age- and sex-matched control group (CG; n = 13) remained inactive. Pre- and post-intervention, maximal cervical ROM in flexion/extension was assessed. A repeated measures ANOVA revealed systematic differences between groups (P < .05). ROM increased following stretching (143.3 ± 13.9 to 148.2 ± 14°; P < .05) but remained unchanged in the CG (144.6 ± 16.8 to 143.3 ± 16.8°; P > .05). Our data point towards existence of a strain transfer along myofascial meridians. Further randomised controlled studies on conditions, factors and magnitude of tensile transmission are warranted. 相似文献
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关于卢瑟福模型中电子的运动是加速还是减速,不同文献给出不同描述,甚至是截然相反的描述.本文分别从能量和力的角度定量、定性地分析了卢瑟福模型中电子的运动情况,得出了卢瑟福模型中电子绕原子核旋转、辐射能量时作加速运动的结论. 相似文献
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试析当前湖北劳动力素质结构 总被引:2,自引:0,他引:2
陈新文 《襄樊职业技术学院学报》2005,4(6):22-24
近年来,湖北经济增长率结束了长时期的下降而开始出现回升,经济发展的状况对全省劳动力就业形势构成了较大影响。表现为经济结构的调整带来了就业形势的变化,并进而影响劳动力素质结构的变化。 相似文献
27.
Alexis Herbaut Pascale Chavet Maxime Roux Nils Guéguen Christophe Gillet Franck Barbier 《European Journal of Sport Science》2016,16(8):1121-1129
This study investigated the immediate effects of reducing the shoe drop (i.e. the difference between the heel and the forefoot height) on the kinematics and kinetics of the lower extremities of children tennis players performing a tennis-specific movement. Thirteen children tennis players performed a series of simulated open stance forehands wearing 3 pairs of shoes differing only in the drop: 0 (D0), 6 (D6) and the control condition of 12?mm (D12). Two embedded forceplates and a motion capture system were used to analyse the ground reaction forces and ankle and knee joint angles and moments of the leading lower limb. In D6 compared with D12, the peak impact force was reduced by 24% (p?=?.004) and the ankle was less dorsiflexed at foot strike (p?=?.037). In D0 compared with D12, the peak impact force was reduced by 17% (p?=?.049), the ankle was less dorsiflexed at foot strike (p?=?.045) and the knee was more flexed at foot strike (p?=?.007). In addition, 4 out of 13 participants (31%) presented a forefoot strike pattern for some of the trials in D0. No difference was observed across shoe conditions for the peak knee extensor moment (p?=?.658) or the peak ankle plantarflexor moment (p?=?.071). The results provide preliminary data supporting the hypothesis that for children tennis players, using a 6-mm lower shoe drop might reduce heel impact forces and thus limit potentially impact-related injuries. 相似文献
28.
杨政 《天津师范大学学报(社会科学版)》2006,1(4):28-32
经济力量、政治力量和社会力量是塑造大城市发展模式的三种基本力量。经济力量是城市发展的物质基础;社会力量是重要推动力;政治力量则起着关键的中介作用。正是这三种力量的结合、互动和博弈塑造了大城市的空间结构和发展模式。在政治、经济和社会的和谐中构建有中国特色的大城市发展模式是当前中国大城市的发展方向和根本路径。 相似文献
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肖庆华 《重庆职业技术学院学报》2004,13(1):99-100
烟囱倾倒过程中,通过对横截面上切应力及拉伸(压缩)应力的计算,确定了倾倒时烟囱被破坏的主要力学原因及表现是,在外侧强大的拉应力作用下,烟囱从外侧开始被拉断. 相似文献
30.
《信阳师范学院学报(哲学社会科学版)》2016,(2)
恩格斯的"历史合力论"作为唯物史观的重要组成部分,不仅具有丰富的理论内涵,而且在实践方面,对于社会主义革命运动的开展和社会主义建设的推进有着积极的指导意义。"历史合力论"强调经济因素的决定性,又不忽视经济因素与其他诸多要素的多元互动的观点表明:当前,我国在社会主义初级阶段推进生态文明建设,现代化的工业文明是生态文明建设的基本物质前提,经济建设仍是重中之重,同时经济因素之外的其他非经济因素是实现生态文明的重要辅助条件,其中广大人民群众作为历史的创造者是生态文明建设的主体力量,这几方面因素相互协调补充,缺一不可。 相似文献