不同水平男子跳高运动员起跳腿空间夹角的运动学分析     

王鹏  王继艳 《吉林体育学院学报》2013,(4):70-76

采用文献资料法、三维影像解析法和数理统计法等方法,对国家健将级和国家二级两种水平男子跳高运动员的技术数据进行分析。研究发现:高水平运动员起跳腿空间夹角明显大于二级运动员,不同水平运动员起跳腿空间夹角的变化趋势相同,同试跳高度成正比;不同水平运动员成功跳次的起跳腿空间夹角均大于失败跳次夹角,较大的起跳腿与横杆矢状面夹角对于二级运动员成功试跳有更大的作用;起跳点与横杆的距离、速度转化率、重心水平速度同起跳腿空间夹角有较大的相关性。  相似文献   

A novel method for the performance of isometric exercise in the home     

Jonathan D Wiles  Damian Coleman  Martin Dunford  Ian Swaine 《Journal of sports sciences》2013,31(8):795-803

There is a paucity of research on devices suitable for home-based isometric exercise. Our aim was to compare cardiovascular responses to isometric exercise using novel and established methods. Ten individuals (age 34.0?±?8.5 years, mass 68.2?±?10.4?kg, height 1.72?±?0.09?m; mean?±?s) performed three different isometric exercise protocols with 48?h between each. Each protocol involved four repeated exercise bouts of 2?min at 30% maximum voluntary contraction force using alternate legs (transducer), alternate arms (transducer), or alternate arms (novel device). Systolic blood pressure, diastolic blood pressure, mean arterial blood pressure and heart rate were measured every 30?s. The highest (peak) values during each 2?min bout of exercise were recorded (peak systolic blood pressure, peak diastolic blood pressure, peak mean arterial blood pressure and peak heart rate). At the end of each 2?min exercise bout, the participants rated their perceived discomfort using Borg's CR-10 scale. There was a statistically significant difference in peak systolic blood pressure between isometric arm flexion using the force transducer and the novel device [158.1?±?10.8 vs. 149.1?±?13.9?mmHg (mean?±?s); P = 0.02]. Further analysis showed that peak systolic blood pressure was on average 9?mmHg higher using the force transducer with limits of agreement of –?15.97 to 33.97?mmHg. Analysis of the peak diastolic blood pressure, peak mean arterial blood pressure, peak heart rate and CR-10 data revealed no statistically significant differences between the three protocols. These results suggest that this novel, home-based method elicited similar cardiovascular responses during isometric exercise to those of established laboratory-based methods. However, the lower peak systolic blood pressure using the modified scales warrants further investigation before this method is used widely in the home.  相似文献   

Patterns of Lower Limb Muscle Activity in Young Boys during a One Foot Static Balance Task     

Charles S. Layne Ph.D. candidate  Lawrence D. Abraham 《Research quarterly for exercise and sport》2013,84(1):36-40

Abstract

Activity patterns of four major muscles were studied in the support leg during a standard one foot balance test. Electromyographic (EMG) activity of the tibialis anterior (TA), peroneus longus (PL), gluteus medius (GM), and adductor magnus (AM) was recorded from 10 boys (aged 7-9 yr) during 30 s balance trials. Rectified, low-pass filtered EMG data, converted to percentages of maximum contractions, were used to establish muscle activation patterns. The results showed that lateral shifts in balance were primarily mediated by the ankle musculature, while the hip muscles appeared to stabilize the pelvis. Immediately prior to lateral shifts of the center of pressure (COP), the activity of each ankle muscle was similar to the activity of the following pose. The hip muscles, however, were not consistently linked to ankle activity. Thus, the control of one-legged lateral balance does not rely on fixed hip-ankle synergies.  相似文献   

试析明式家具“一腿三牙”方桌     

朱轶群 《苏州教育学院学报》2009,26(1):73-75

明式家具中的一腿三牙方桌是无柬腰方桌的一种特殊形式。一腿三牙方桌的设计艺术特点就是把人们的需求、科学技术和艺术完美地、天衣无缝地结合在亍一起。无论是它的实用性还是它的形式美感都通过其物化的本身传达给我们。它不仅体现了明式家具科学的卯榫结构制作技艺,还展示了为人造物设计艺术的精髓,以及深邃的美学内涵及人文精神。  相似文献   

跳远起跳时摆动腿脚踝动作所产生的定型摆腿特点与作用研究     

山美娟  李海峰  程致远 《吉林体育学院学报》2010,26(2):69-70

通过对挺身式跳远起跳时摆动腿脚踝动作的分析研究发现,挺身式跳远起跳时摆动腿脚尖勾起（踝关节背曲）制动有利于提高身体重心垂直做功的高度,增加向上的垂直速度。跳远起跳时摆动腿脚尖勾起的摆动腿制动更有利于防止腾空时身体的前旋。  相似文献   

女子散打鞭腿防守技术研究——以王薇在2010年全国散打锦标赛为例     

敬继红  秦永修 《军事体育进修学院学报》2012,31(2):70-72

通过采用逻辑分析法、数据统计法和录像观察法对王薇在2010年全国女子散打锦标赛王薇在比赛中主要失分动作手段进行研究,旨在对王薇在比赛中的失分有所认识。分别探讨了王薇对拳、腿、摔三种主要进攻动作的防守技术在比赛中使用情况。通过查阅文献和观察录像,从中发现在女子散打比赛中,腿法进攻占主导地位,对腿法防守的好坏直接影响运动员的比赛成绩,摔法居中,拳法最低。而在腿法中侧踹腿,鞭腿,正蹬腿和其他腿法,鞭腿的使用次数和成功率都是最高的。因此在今后的训练中有必要加强防守鞭腿的技术,突出重点练习。  相似文献   

The kinematics and force analysis of a new leg mechanism for multi-legged wall-climbing robot     

Luo Yi Qian Jinwu Shen Yaozong Gong Zhenbang 《上海大学学报(英文版)》1998,2(1):49-53

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新析背向滑步推铅球技术中摆动腿的作用   总被引：1，自引：0，他引：1  

杨军 《湖北体育科技》1999,(4)

通过对背向滑步推铅球技术中摆动腿动作的分析,全面、系统地阐述了摆动腿在背向滑步推铅球技术中的作用。因此一不论在体育教学或运动训练中,都应高度重视摆动腿在背向滑步推铅球技术中的重要性。  相似文献   

论直道跨栏跑的分段跑   总被引：6，自引：0，他引：6  

汪广茂  雷艳云  王玲 《安徽体育科技》2001,(3):44-46

在总结十几年跨栏跑教学和训练的基础上 ,提出了组成直道跨栏跑技术结构的三个部分 ,即起跑和疾跑、途中跑、终点冲刺。并阐述了这种和短跑极其相似 ,但又和短跑有不同结构的三个技术阶段在教学中的具体操作和运用。目前 ,这种提法在我国尚属首次。  相似文献   

屈膝高摆在110m栏起跨技术中的作用及训练方法   总被引：1，自引：0，他引：1  

何忠  许志琳 《武汉体育学院学报》1997,(3)

本文对110m栏起跨技术中屈膝高摆技术进行了分析,提出了发展和完善该技术的训练方法.  相似文献