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1.
背向滑步推铅球的衔接技术 总被引：6，自引：0，他引：6
衔接技术是铅球投掷技术的重要环节，是沟通滑步技术与最后用力技术的关键。恰当地把握这一项技术环节是完整推铅球技术的核心。衔接技术又叫过渡步技术，近几年来，对优秀运动员推铅球的衔接技术有适当的分析。本文在前人实验的基础上，对衔接技术进行综合分析，目的在于正确阐明衔接技术的要领，衔接技术与滑步技术、预行速度、重心移动轨迹等之间存在的关系，从而使整体技术更加符合运动技术原理，利于提高运动成绩。 相似文献
2.
韩国芬 《沈阳体育学院学报》1994,(1)
铅球运动员的成绩要达到高水平,就必须掌握良好的投掷技术。良好的投掷技术体现在正确的最后用力、平稳快速的滑步以及滑步与最后用力的有力衔接三个方面。由于滑步能使运动员和铅球获得预先的速度,因此滑步推铅球比原地推铅球的效果更佳。笔者就此问题进行了初步研究。 相似文献
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中国优秀女子运动员推铅球速度特征发现与分析 总被引：2，自引：0，他引：2
以１２名专项成绩在１７．３６ｍ以上采用背向滑步推铅球技术的中国优秀女子运动员为研究对象,采用高速摄影与影片解析等方法,研究分析运动员推铅球技术的身体重心与铅球速度及其关系变化特征。研究结果表明：滑步结束时铅球运动速度存在一个适宜区段;运动员最后用力发力时间是在最后用力阶段之前;全程推球中铅球速度有两个较大起伏,而不是不断加速等。研究结果有助于教练员、运动员正确认识推铅球技术。 相似文献
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滑步速度对推铅球成绩具有重要的作用, 但是,滑步距离短使滑步速度提高受到 了限制。而有关资料表明,即使优秀运动员对 滑步速度的利用率也只有３０％－４０％。因此, 如何提高铅球运动员滑步速度的利用率问题, 值得我们深入思考和研究。一、铅球在出手前的运行应符合弹道原理 （一）根据弹道原理,运动员在滑步时, 只有使铅球的运动轨迹与最后用力方向趋向一 条直线,才能使铅球出手初速度更快,从而使 铅球飞出距离更远。也就是说,要想使推铅球 成绩更好,运动员就应该尽力使铅球在滑步阶 段和最后用力阶段所获得的速度方向在一条… 相似文献
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优秀男子铅球运动员滑步阶段技术的三维运动学分析 总被引：1，自引：0，他引：1
通过文献资料法、三维运动学分析法、数理统计法等方法,以黑龙江省3名优秀男子铅球运动员为研究对象,对推铅球滑步阶段技术进行了分析研究。结果显示：滑步阶段运动员的身体重心水平速度偏小,垂直速度偏大,右脚蹬地角偏大,滑步时间长。 相似文献
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推铅球技术的演变暨旋转式推铅球技术的要点和难点 总被引：2，自引：0，他引：2
推铅球运动．经历了几百年的发展过程。近年来．在世界田径赛场上，运用背向滑步技术和旋转式技术的运动员均创造了优异的成绩。而在我国国内铅球比赛中仍然是背向滑步技术一枝独秀。稀有使用旋转式技术的运动员。在体育院校田径教学中，旋转式推铅球技术也基本是个“空白点”。为了对旋转式技术做进一步了解，丰富体育院校田径教学内容，本运用献资料法、数理统计法、对比分析法对旋转式推铅球技术要点和难点在理论上进行分析探讨。结果表明：(1)旋转式技术比较符合投掷的原理，与背向滑步技术相比具有一定的先进性；(2)旋转式技术以其加速路径比较长，预先速度大。动作自然连贯等技术特征比较适合中国铅球运动员协调性好、爆发力强、速度快等特点。 相似文献
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通过旋转式推铅球技术和背向滑步技术的对比分析,并结合我国铅球运动员的身体素质,提出旋转式推铅球更加符合中国铅球运动员的身体条件,并将可能成为中国铅球成绩上升的突破点,为教练员、运动员在铅球训练中应用此技术提供参考. 相似文献
8.
前言 推铅球是一项古老的田径投掷项目。从古至今,铅球技术在不断地进行演变并趋于完善,由原地演变到滑步(侧向、半背向、背向)旋转推铅球。目前背向滑步推铅球技术被多数运动员所采用,其技术环节是器材的握持方法、预备姿势、滑步、最后用力与维持身体平衡。 相似文献
9.
现代的铅球技术包括滑步和最后用力两个技术部分,这两个技术部分是不可分割的完整技术体系。衔接技术的好坏直接影响到铅球技术的发挥和成绩的提高。推铅球技术中只有在做好衔接技术的基础上,才能做到把滑步所创造的预先速度过渡到最后用力中去和用力之前是否保证最有力的姿势,其重要的一点就在于衔 相似文献
10.
《体育科技文献通报》2001,(3)
G824.119 20011264推铅球滑步与最后用力衔接技术教法探讨〔刊,中,I〕/罗勇//贵州体育科技.-2000(2).-33-34(SML)铅球//滑步//最后用力//技术分析 相似文献
11.
This study examined the effect of carbohydrate ingestion on metabolic and performance-related responses during and after a simulated 1h cycling time trial. Eight trained male cyclists (VO 2 peak = 66.5ml kg -1 min -1 ) rode their own bicycles mounted on a windload simulator to imitate real riding conditions. At a self-selected maximal pace, the cyclists performed two 1h rides (separated by 7 days) and were fed either an 8% carbohydrate or placebo solution. The beverages were administered 25 min before (4.5ml kg -1 ) and at the end (4.5ml kg -1 ) of the ride. With carbohydrate feeding, plasma glucose tended (P = 0.21) to rise before the time trial. Compared with rest, the plasma glucose concentration decreased significantly (P < 0.05) at the end of both rides, with no statistically significant difference being observed between treatments. Thereafter, plasma glucose increased significantly (P < 0.05) at 15 and 30 min into recovery, and was significantly higher at 30 min during the carbohydrate trial compared with the placebo trial. No significant changes in plasma free fatty acids were observed during the ride. However, a significant increase (P < 0.05) in free fatty acids was found at 15 and 30 min into recovery, with no difference between trials. Mean power output was significantly (P < 0.05) greater during the carbohydrate compared with the placebo trial (mean - S.E.: 277-3 and 269-3W, respectively). The greater distance covered in the carbohydrate compared with the placebo trial (41.5-1.06 and 41.0–1.06km, respectively; P < 0.05) was equivalent to a 44s improvement. We conclude that pre-exercise carbohydrate ingestion significantly increases endurance performance in trained cyclists during a 1h simulated time trial. Although the mechanism for this enhancement in performance with carbohydrate ingestion cannot be surmised from the present results, it could be related to a higher rate of carbohydrate oxidation, or to favourable effects of carbohydrate ingestion on the central component of fatigue. 相似文献
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Roy J. Shephard 《Journal of sports sciences》2013,31(7):603-620
The biology and medicine of rowing are briefly reviewed. Effort in a 2000 -m race is about 70% aerobic. Because the boat (and in some instances a cox) must be propelled, successful competitors are very tall, with a large lean mass and aerobic power. Large hearts may lead to erroneous diagnoses of a cardiomyopathy. Large respiratory minute volumes must be developed by chest muscles that are also involved in rowing. The vital capacity is typically large, and breathing becomes entrained. Expiration cannot be slowed relative to inspiration (as normally occurs at high rates of ventilation) and the limiting flow velocity may be reached, with the potential for airway collapse. Performance is strongly related to the power output at the ‘anaerobic threshold’, and lactate measures provide a guide to an appropriate intensity of endurance training. Peak blood lactate levels are higher in males (commonly 11–19 mmol·l -1 and occasionally as high as 25 mmol·l -1) than in females (9–11 mmol·l -1), probably because males have a greater muscle mass in relation to blood volume. The skeletal muscles are predominantly slow twitch in type, developing an unusual force and power at low contraction velocities. Many rowers have a suboptimal diet, eating excessive amounts of fat. Lightweight rowers also have problems of weight cycling. Aerobic power and muscle endurance often change by 10% over the season, but such fluctuations can be largely avoided by a well-designed winter training programme. Injuries include back and knee problems, tenosynovitis of the wrist and, since the introduction of large blades, fractures of the costae. 相似文献
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许良 《体育科技文献通报》2011,19(2):1-4
基于1985、1995和2005年全国学生体质调研数据,对各时期我国城乡学生形态、机能、体能发展水平进行系统地定量研究,动态分析20年全国城乡学生体质发展的特点与规律。主要研究结果：（1）近20年城乡学生生长发育持续提前,城市学生各项形态指标生长水平高于乡村,身高城乡差距缩小,体重、胸围城乡差距加大;（2）城市学生肺活量水平高于乡村,城乡学生肺活量20年持续下降,前10年乡村学生下降快、后10年城市学生下降快;（3）乡村学生800m、1000m跑水平高于城市,城市女生50m跑、仰卧起坐水平高于乡村,其他素质城乡学生水平波动较大;（4）城市女生50m跑20年持续下降,城乡学生800m和1000m跑、城市学生50m×8往返跑20年加速下降,其他素质20年间有增有降发展极不平稳。 相似文献
14.
采用测量、问卷调查、数理统计等方法,分析定向运动学习前后对大学生身心健康的影响.结果经T检验和x2检验且表明：定向运动不仅能增强学生体质健康水平,而且有助于学生的情绪调节,增强自信心与创新意识,培养勇敢顽强的意志品质,建立良好的人际关系,能有效地促进学生身心健康发展.为了全面提高大学生整体素质,积极实践,构建定向运动课内外一体化教学模式,进行定向运动课程模块化教学,以满足学生的多元化需求. 相似文献
15.
Alan M. Nevill Roger L. Holder Andrew Bardsley Helen Calvert Stephen Jones 《Journal of sports sciences》2013,31(4):437-443
A regression analysis of competitors' tournament results in relation to their world rankings was proposed to identify the effect of home advantage in international ‘grand-slam’ tennis and ‘major’ golf tournaments. The results provided little evidence of home advantage in either the grand-slam tennis or the golf tournaments held in 1993. The only possible evidence of home advantage was found in the Wimbledon tennis and the US Open golf championships. Even these findings can be explained, at least partially, by (1) the availability of information concerning the low world rankings of the British tennis players competing at Wimbledon, and (2) selective entry, allowing only the world's top-ranked foreign golfers into the US open golf tournament. In both cases, the lower ranking home competitors have a greater opportunity to perform above their anticipated world rankings. Therefore, provided entry into tennis and golf tournaments is truly ‘open’ to both the host nation's representatives and foreign competitors alike, home advantage does not appear to be a major factor influencing the competitors' performance in such competitions. These findings may be explained by the relatively objective nature of the scoring systems used in tennis and golf, unlike the subjective influence of refereeing decisions on the results of team-games such as soccer. 相似文献
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曲爱宁 《体育科技文献通报》2007,15(8):97-98
柔韧素质是健美操专业学生的专项素质之一,通过对普通高校健美操专业学生分组对照进行柔韧性训练的实验研究,认为对训练肌群辅以按摩器振颤刺激,可大大提高柔韧性训练效果。 相似文献
18.
我国城市体育自然环境建设与发展的研究 总被引：5，自引：0，他引：5
采用实地调查研究、理性思维研究和文献资料调研等方法对主要问题进行了专门研究，提出了进行城市体育场所区域生态功能区划、设计体育生态功能区布局的方案、做好体育场所绿色环境系统规划、制定体育场所生态与绿地管理措施等基本观点，提出了若干城市体育自然环境建设与发展的对策。 相似文献
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重新认识体育的社会关联 总被引：3，自引：1，他引：2
体育与政治之间存在一个悖论，体育的发展与经济实力之间没有直线相关，体育与教育部分重叠，体育与宗教最为近缘，体育可借用科学手段，体育的艺术禀性日益明显，体育与养生反映着两种人生观。 相似文献