Lower extremity injury in female basketball players is related to a large difference in peak eversion torque between barefoot and shod conditions

BackgroundThe majority of injuries reported in female basketball players are ankle sprains and mechanisms leading to injury have been debated. Investigations into muscular imbalances in barefoot versus shod conditions and their relationship with injury severity have not been performed. The purpose of this study was to investigate the effects of wearing athletic shoes on muscular strength and its relationship to lower extremity injuries, specifically female basketball players due to the high incidence of ankle injuries in this population.MethodsDuring pre-season, 11 female collegiate basketball players underwent inversion and eversion muscle strength testing using an isokinetic dynamometer in both a barefoot and shod conditions. The difference between conditions was calculated for inversion and eversion peak torque, time to peak torque as well as eversion-to-inversion peak torque percent strength ratio for both conditions. Lower extremity injuries were documented and ranked in severity. The ranked difference between barefoot and shod conditions for peak torque and time to peak torque as well as percent strength ratio was correlated with injury ranking using a Spearman rho correlation (ρ) with an α level of 0.05.ResultsThe ranked differences in barefoot and shod for peak eversion and inversion torque at 120°/s were correlated with their injury ranking. Ranking of the athletes based on the severity of injuries that were sustained during the season was found to have a strong, positive relationship with the difference in peak eversion torque between barefoot and shod (ρ = 0.78; p = 0.02).ConclusionIt is possible that a large discrepancy between strength in barefoot and shod conditions can predispose an athlete to injury. Narrowing the difference in peak eversion torque between barefoot and shod could decrease propensity to injury. Future work should investigate the effect of restoration of muscular strength during barefoot and shod exercise on injury rates.     

中高水灰比混凝土强度与工作性能的研究

混凝土依赖水灰比(W/B)获得工作性能,中高水灰比混凝土之所以有较高的强度,是因为使用了超硫酸盐水泥。超硫水泥在水化期间能够形成大量的钙矾石晶体,从而抵抗了部分混凝土的收缩,因此中高水灰比混凝土在工作性得到保证的同时,也具有较高的强度。本研究内容是:(1)超硫水泥在不同配比下的标准稠度需水量、流动度、凝结时间。(2)使用不同配比超硫水泥的混凝土的坍落度、扩展度、含气量及抗压抗折强度实验。通过实验找出强度和工作性能良好的混凝土配合比。     

排球运动员的体能特征与训练探析

本文着重对排球运动中的体能特征与训练进行了探讨,从体能训练的概念、生物学基础、频度和节奏、训练注意事项等方面作出分析,提出体能训练是现代排球比赛竞争的基础条件之一,体能训练不能等同于身体素质训练,体能训练应有自己的生物学基础。     

扩张网砂浆面层加固已破坏砖房的抗侧承载力计算方法

本文在扩张网材料性能试验以及采用扩张网与相同用钢量的冷拔低碳钢丝网砂浆加固面层破坏砖房的抗震性能对比试验基础上,根据扩张网及其优异的材料性能,参照混凝土剪力墙抗剪承载力公式的形式,提出了扩张网砂浆面层的抗侧承载力的砖墙抗侧力的抗侧承载力平均值计算方法—组合作用法。该法计算结果与试验实测结果吻合较好。     

黑龙江省摔跤运动员核心区域力量训练方法调研

通过专家访谈、文献资料、问卷调查、数理统计和实验等研究方法,调查黑龙江省摔跤队核心区域力量训练现状,并以之证实核心区域力量的重要性、有效性,提出针对性意见和建议,使摔跤运动员核心区域力量得以全面、有效的提高。     

健美操核心肌肉力量训练对女大学生动态平衡能力的影响

目的:探讨健美操核心肌肉力量训练对女大学生动态平衡能力的影响。方法:将本科一年级选修健美操专项课的女大学生为研究对象,随机分成对照组和核心力量组2组,每组8人,共计16人。对照组进行常规训练,核心力量组进行为期6周的核心力量训练。6周训练结束后,进行动态平衡测试和表面肌电(sEMG)测试。结果:睁眼和闭眼状态下,核心力量组综合动摇指数(OS),前/后动摇指数(A/P),中间/侧方动摇指数(M/L)均小于对照组,存在显著性差异(P<0.05);核心力量组腓肠肌和胫前肌积分肌电(iEMG)及中位频阈(MF)均小于对照组,且两组之间有显著性差异(P<0.05)。结论:健美操教学中核心肌肉力量训练能够有效地提高女大学生的动态平衡能力。     

男子体操运动员专项力量训练理论探讨

随着体操技术动作难度要求越来越高，对体操运动员的专项力量素质也提出了更高的要求，但是目前关于体操专项力量方面训练方面的研究还比较有限，本文主要是关于体操专项力量训练方法、手段的论述，并提出自己的观点。     

篮球运动的力量特点及训练

日益激烈的篮球比赛越来越突出力量的重要性，现就篮球力量的特点进行分析，并提出发展力量的新观念、新方法，力在推进我国篮球的竞技水平。     

论<四体书势>中势的生命意蕴

作为一个美学范畴的势,在中国古代的各个艺术门类中都有着广泛的运用,它包蕴着极为丰厚的意蕴,我们以西晋时的书法理论著作<四体书势>为切入点,通过对"势"这一范畴基本属性的分析来探求这一美学范畴的产生根源.我们认为在中国古代,"势"之所以受到各种艺术的钟爱,就在于它根植于我国古代天人合一,万物有灵的生命哲学观,体现了中国古代先民对生命之美的最深切的感悟.     

中长跑运动员的腿部力量问题探析

中长跑训练中如何对待腿部力量的训练，采用什么方法，世界上不少著名教练均有不同的看法。本文着重分析了腿部力量在中长跑运动中的生理特点，并对如何训练腿部力量进行了理论分析与探讨。