中跑运动员的速度力量训练     

阿·波鲁宁  格·纳尔金斯  潘玉波  陈艳萍 《山东体育科技》1993,(3)

中跑运动员的速度力量训练是一切从事实际训练工作的教练员所关切的问题.原苏联国家队耐力组教练员阿·波鲁宁和原全苏体科所的格·纳尔金斯博士.对中跑速度力量训练进行了专门研究。现由他们来回答这类问题。  相似文献   

整体大于部分     

卡罗琳·奥林奇  吴海玲 《小学教学设计》2003,(8)

老师把我叫到全班同学面前 ,斥责我在拼写测验中只得了68分 ,但那时我整体累积分数已达到99分。处方 教师和家长经常犯的一个错误是 ,只关注学生消极的一面而忽略其积极的一面。在上述情节中 ,教师完全忽视学生得到的累积高分 ,只注意到她的拼写成绩差。教师在众人面前斥责学生以示惩罚 ,却没有发现并表扬学生的累积高分。这让学生感到困惑 ,搞不清自己究竟是成功者还是失败者。有见识的教师知道 ,如果必须批评学生表现的某些方面 ,也应适度。在本情节中 ,学生整体表现不错 ,只是拼写方面比较差。老师应该鼓励学生提高自己的拼写能力 ,表扬…  相似文献   

别信——生菜特别具有营养价值     

乌多·波尔默  苏珊娜·瓦尔穆斯 《出版参考》2003,(17)

至于维生素含量嘛,您可以完全静下心来仔细地找——什么?找来找去没找到?!谁把生菜里的维生素藏起来了?!看来为了能在生菜中发现维生素,我们要采用一种全新的分析检验方法了。但即使这样,能找出的维生素量还是不值得用“含有”这两个字来说明。  相似文献   

The energetics and benefit of an arm swing in submaximal and maximal vertical jump performance     

Lees A  Vanrenterghem J  De Clercq D 《Journal of sports sciences》2006,24(1):51-57

The aims of this study were to investigate the energy build-up and dissipation mechanisms associated with using an arm swing in submaximal and maximal vertical jumping and to establish the energy benefit of this arm swing. Twenty adult males were asked to perform a series of submaximal and maximal vertical jumps while using an arm swing. Force, motion and electromyographic data were recorded during each performance and used to compute a range of kinematic and kinetic variables, including ankle, knee, hip, shoulder and elbow joint powers and work done. It was found that the energy benefit of using an arm swing appears to be closely related to the maximum kinetic energy of the arms during their downswing, and increases as jump height increases. As jump height increases, energy in the arms is built up by a greater range of motion at the shoulder and greater effort of the shoulder and elbow muscles but, as jump height approaches maximum, these sources are supplemented by energy supplied by the trunk due to its earlier extension in the movement. The kinetic energy developed by the arms is used to increase their potential energy at take-off but also to store and return energy from the lower limbs and to "pull" on the rest of the body. These latter two mechanisms become more important as jump height increases with the pull being the more important of the two. We conclude that an arm swing contributes to jump performance in submaximal as well as maximal jumping but the energy generation and dissipation sources change as performance approaches maximum.  相似文献   

安拉和电脑     

布瑞吉蒂·罗沙里欧  邓笛  羽狐 《世界儿童(小学生阅读版)》2006,(1)

安拉的父母每天都要工作很长时间。“安拉,今天我要参加一个会议。”爸爸在电话里说,“如果你需要帮助,可以找邻居特威哥太太。”“安拉,我要接待一个重要的客商。”妈妈过了一会儿也打来了电话,“你自己将菜放进微波炉里热一下。”“知道了。”安拉大声答道。又是一个人呆在家  相似文献   

Elite football on artificial turf versus natural grass: movement patterns, technical standards, and player impressions     

Andersson H  Ekblom B  Krustrup P 《Journal of sports sciences》2008,26(2):113-122

The aim of the present study was to examine the movement patterns, ball skills, and the impressions of Swedish elite football players during competitive games on artificial turf and natural grass. Time - motion analyses (36 observations) and technical analyses (16 team observations) were performed and 72 male and 21 female players completed a questionnaire. No differences were observed between artificial turf and natural grass in terms of total distance covered (mean 10.19 km, s = 0.19 vs. 10.33 km, s = 0.23), high-intensity running (1.86 km, s = 0.10 vs. 1.87 km, s = 0.14), number of sprints (21, s = 1 vs. 22, s = 2), standing tackles (10, s = 1 vs. 11, s = 1) or headers per game (8, s = 1 vs. 8, s = 1), whereas there were fewer sliding tackles (P < 0.05) on artificial turf than natural grass (2.1, s = 0.5 vs. 4.3, s = 0.6). There were more short passes (218, s = 14 vs. 167, s = 12) and midfield-to-midfield passes (148, s = 11 vs. 107, s = 8) (both P < 0.05) on artificial turf than natural grass. On a scale of 0-10, where 0 = "better than", 5 = "equal to", and 10 = "worse than", the male players reported a negative overall impression (8.3, s = 0.2), poorer ball control (7.3, s = 0.3), and greater physical effort (7.2, s = 0.2) on artificial turf than natural grass. In conclusion, the running activities and technical standard were similar during games on artificial turf and natural grass. However, fewer sliding tackles and more short passes were performed during games on artificial turf. The observed change in playing style could partly explain the male players' negative impression of artificial turf.  相似文献   

安娜·查克维塔泽双手反拍赏析     

翠茜·奥丝汀  金路 《网球》2008,(9):120-121

21岁的俄罗斯姑娘并不是网球场上最高最壮的选手,但她平稳而有力的双手反拍,打得非常漂亮。1查克维塔泽的对手打来一记球速慢、弹跳高的球(看她眼睛锁定的高度),但她并没有浪费时间,正在积极进行准备——球拍始终放在身后,以便在需要的时候迅速挥出。她的双肩已经转到合适的位置,双膝微微弯曲,并将重心放在后脚。而她离开地面的前脚正在向前上步,准备迎击来球。经常能够看到一些业余选手在面对慢球时,表现得非常放松。他们认为,"哦太好了,我有许多时间来把球打回去"。其实,你应该对每一个来球都一视同仁。查克维塔泽的对手正要送给她一个进攻的机会,她是不会拒绝的。  相似文献   

中国移民在俄国——中国移民对俄国远东发展的贡献   总被引：1，自引：0，他引：1  

亚历山大G·拉宁  李宏为 《历史档案》1994,(2)

本文作者系俄罗斯科学院远东研究所台湾研究部主任、高级研究员。本文译自治湾出版的《近代中国史研究通讯》1993年第16期。本文虽有不少提法和观点，为我们所不能同意，但文内提供了不少有关中国侨民在沙俄及前苏联的情况，有一定的参考的研究价值，故仍全文照译发表。  相似文献   

奥运会体操简史     

约翰V·格罗姆巴奇  李佐惠 《体育文化导刊》1992,(2)

体操曾是世界上宣传最少的运动之一。然而,体操运动员在一个晚会上所作的那些充满着惊险和难度的表演胜过了多数棒球手、足球或田径运动员们在一个季节中的表演。作为一项运动的体操自身证明它比许多别的运动历史悠久。如今它已  相似文献   

新疆伊犁哈萨克自治州民族中小学汉语教学质量现状调查与对策研究     

古丽尼萨·加玛勒 《民族教育研究》1997,(2)

新疆伊犁哈萨克自治州民族中小学汉语教学质量现状调查与对策研究古丽尼萨加玛勒汉语不仅是我国各族人民之间交际的重要工具，而且是联合国五大工作语言之一。８０年代初，我区各民族中小学把汉语作为一门主课列入教学计划，汉语教学已取得了可喜的成绩。但是，由于语言...  相似文献