掷标枪时的速度叠加效应及其训练

该文运用有关理论原理和方法,探析了掷标枪时的速度叠加效应,指出这是提高掷标枪运动成绩的有效途径。     

浅谈长江平顺抛石护岸工程的质量控制

长江河势演变剧烈,岸线崩塌时有发生,平抛抛石护岸为长江整治采取的有效工程措施之一,针对该种工程措施的隐蔽性、复杂性,从平顺抛石护岸的质量控制角度出发对镇扬河段整治工程施工质量监督工作进行了总结,提出了“抛准、抛足、抛匀”的质控措施。     

二十世纪六十年代以来陈天华研究综述

陈天华是我国近代史上著名的资产阶级民主革命家、思想家和宣传家。他的思想主要包括反帝爱国思想、反封建民主革命思想、史学思想、哲学思想及教育思想等。而反帝爱国思想是其思想的主体部分。研究他的生平及其思想对于进一步研究辛亥革命乃至中国近代史都是大有裨益的。     

对"鞭打送枪"末节用力技术的研究

通过对新旧两种标枪投掷技术和标枪特性的对比分析,提出了“鞭打送枪”技术的观点,它能较好地适应新型标枪的性能和特点,并从生物力学角度进行了分析,希望能够为提高我国的标枪运动水平和基础训练水平,提供有价值的参考。     

《学生体质健康标准》测试工作的研究分析

为了贯彻落实“健康第一”的指导思想,教育部、国家体育总局联合颁布了《学生体质健康标准(试行方案)》(以下简称《标准》),根据新疆维吾尔自治区实施《标准》,结合本校实际情况先后对在校学生进行了两次学生体质健康测试,通过对测试结果分析和《标准》实施工作的总结,探讨实施学生体质健康测试工作的有关问题。     

对右手掷标枪技术教学中左侧技术的研究

在掷标枪的技术教学中，持器械手的异侧技术往往被忽视．本运用运动学，生物力学等学科的基础理论知识，结合标枪项目的专项特点，着重对左腿、左臂在右手掷枪的交叉步与最后用力两个重要阶段的工作方法进行说明．     

现代标枪投掷技术的训练方法及发展趋势研究

能力是基础，技术是关键，这是现代标枪的投掷特点和发展趋势。因此在投掷过程中首先要了解标枪在空中的运行轨迹并结合标枪的特点采取相适应的出手角和冲击角，才能发挥运动员身体最大潜能，获得良好运动成绩。     

论高空掷物侵权责任认定

高空掷物侵权作为民法中的特殊侵权行为,由于在司法实践中其行为主体的难确定性,导致对该侵权行为的责任主体和责任形态的认定存在较大的争议。通过对侵权责任形态的构成要件以及事实行为与法律行为的界定,认为在该侵权行为的责任认定上,应当适用公平原则,由建筑物的相关使用人共同承担侵权损害赔偿责任,责任形态为分担责任。     

Kinematic and kinetic variability associated with the cable put and seated rotation assessments

ABSTRACT

When new protocols are developed, there is a requirement to investigate test–retest reliability of measures for valid use and interpretation of data in research and practice. Therefore, the aim of this investigation was to determine the inter-day reliability of the cable put and seated rotation assessment protocols. On three occasions, nine resistance-trained men performed cable puts and cable rotations at different loads between 6 and 42 kg on a commercially available cable cross over machine. Load stack movement was recorded using a PT5A linear position transducer from which all kinematic and kinetic variables were calculated. Reliability was excellent for peak velocity and displacement based on intraclass correlation coefficient (ICC) and coefficient of variation (CV) across the majority of loads and movements (cable put: ICC = 0.92 to 0.99, CV = 3.1% to 8.6%; cable seated rotation: ICC = 0.76 to 0.99, CV = ?1.7% to 16.1%). However, kinetic variables demonstrated inadequate reliability across the majority of days, loads and movements (ICC = 0.70, CV >10%). It was concluded that peak velocity is a reliable kinematic measure to assess muscular capability from cable put and seated rotation protocols; however, kinetic measures are too variable to provide reliable outputs across testing occasions.     

Gender Differences in Children's Throwing Performance: Biology and Environment

Abstract

This study evaluated the influence of biological and environmental variables on the differences between the throwing performance of 5-year-old girls and boys. A total of 100 children (48 girls, 52 boys) were tested on throwing for distance and rated on two components of throwing form—trunk rotation, and foot action. Children were evaluated on eight biological characteristics—height, weight, body mass index, ponderal index, sum of four skinfolds, body diameters, arm and leg girths, and somatotypes—and four environmental characteristics—older brother, older sister, presence of adult male, and playing with older children. Results indicated that boys threw farther than girls and exhibited more mature form. Boys had greater joint diameters than girls, a smaller sum of four skinfolds, and more estimated arm muscle. Boys were more likely to play regularly with older children. Girls' throwing performance was only 57% that of boys, but when throwing was adjusted for a linear composite of biological variables, girls' throwing performance increased to 69% of boys'. Thus, while the differences in most motor performance tasks between boys and girls prior to puberty have been attributed to environmental factors, some of the differences in throwing performance appears to reflect biological characteristics, even as early as 5 years of age.