广西自治区九运会举重比赛调研报告

研究结果表明 ,广西青少年举重运动正处于上升阶段。其表现背景是小级别优势项目仍在发挥作用 ,运动水平增长速度较快 ,运动员达到高水平的年龄和训练年限趋向提早 ,重点项目布局体系正在发挥效益功能。但试举成功率较低 ,杠铃后掉和挺不起是试举失败的主要因素。     

试论农村初中辍学及其对策

目前农村初中辍学客观存在,困扰着农村的“双基”教育。本文分析了农村初中学生辍学的原因,提出了防止学生辍学的具体措施和新的办法。     

Reviewing the Variability-Overuse Injury Hypothesis: Does Movement Variability Relate to Landing Injuries?

Purpose: Overuse injuries are common in sport, but complete understanding of injury risk factors remains incomplete. Although biomechanical studies frequently examine musculoskeletal injury mechanisms, human movement variability studies aim to better understand neuromotor functioning, with proposed connections between overuse injury mechanisms and changes in motor variability. Method: In a narrative review, we discuss the variability-overuse injury hypothesis, which suggests repeated load application leads to mechanical tissue breakdown and subsequent injury when exceeding the rate of physiological adaptation. Due to the multidisciplinary nature of this hypothesis, we incorporate concepts from motor control, neurophysiology, biomechanics, as well as research design and data analysis. We therefore summarize multiple perspectives while proposing theoretical relationships between movement variability and lower extremity overuse injuries. Results: Experimental data are presented and summarized from published experiments examining interactions between experimental task demands and movement variability in the context of drop landing movements, along with comparisons to previous movement variability studies. Conclusion: We provide a conceptual framework for sports medicine researchers interested in predicting and preventing sports injuries. Under performance conditions with greater task demands, we predict reduced trial-to-trial movement variability that could increase the likelihood of overuse injuries.     

活性钙预防运动员训练比赛中强直性肌肉抽搐的研究──附8例临床报道

运动员在训练比赛中常发生强直性肌肉抽搐,这种现象可能与血浆中［Ｃａ２＋］下降有关。针对其采用活性钙混悬液口服法快速补充［Ｃａ２＋］,预防了大运动量训练和比赛时肌肉抽搐的发生。     

从八运会看我国女子举重比赛存在的几个问题

运用调查统计的方法对第八届全国运动会女子举重比赛出现的情况进行了分析。重点探讨、分析了教练员对比赛战术的运用,运动员试举失败的教训,成功的经验以及运动员抓举与挺举之间的比例问题。旨在促进我国女子举重运动水平不断提高。     

河南省中长跑运动水平下滑的原因分析及对策研究

运用文献资料法、问卷调查法、测试法和数理统计法,对河南省及我国部分省市的中长跑有关情况进行研究,分析河南省中长跑运动水平下滑的原因并提出相应的对策,为河南省中长跑运动水平的提高提供理论参考。     

Increasing plantarflexion angle during landing reduces vertical ground reaction forces,loading rates and the hip’s contribution to support moment within participants

The ankle joint’s role in shock absorption during landing has been researched in many studies, which have found that landing with higher amounts of plantarflexion (PF) results in lower peak vertical ground reaction forces and loading rates. However, there has not yet been a study that compares drop landings within participants along a quantitative continuum of PF angles. Using a custom-written real-time feedback program, participants adjusted their ankles to an instructed PF angle and dropped onto two force platforms. For increasing PF, peak ground reaction force and peak loading rate during weight acceptance decreased significantly. The hip’s contribution to peak support moment decreased as PF at initial contact increased up to 30°. The ankle and knee contributions increased over this same continuum of PF angles. There appears to be no optimal PF angle based on peak ground reaction force and loading rate measurements, but there may be an optimum where joint contributions to peak support moment converge and the hip moment’s contribution is minimised.     

基于ANYSYS的电路板组件的跌落仿真

基于ANSYS/LS-DYNA的结构动力分析模块,对印刷电路板组件进行了跌落仿真分析,模拟了整个跌落撞击过程,分析不同边界条件以及封装件的布置方式对电路板组件动态响应的影响。     

我国优秀女子举重选手挺举技术分析

使用两台 PHOTO-SONICS IPL 型16mm 高速同步摄影机,拍摄了1990年北京第11届亚运会女子举重比赛我国9名参赛选手(其中7名世界纪录创造者,1名世界锦标赛冠军)的挺举技术影片,通过对影片的解析、分析,得出如下结论:1.通过分析对比找出女选手挺举技术与男选手的差别;2.9名女选手相比,施文的技术较好,黄晓瑜的技术有较大的改进潜力;3.膝关节的最佳发力角和运动幅度与膝关节肌的功能以及人体整体姿势和总体负荷有关。     

1HNMR滴定分析法测定七元瓜环与腺嘌呤的包结作用

利用HNMR技术,采用滴定分析法考察了普通七元瓜环与腺嘌呤的相互作用,解析了其作用产物的结构特征。实验结果显示,普通七元瓜环与腺嘌呤能形成1:1的包结配合物。