Influence of non-preferred foot technical training in reducing lower limbs functional asymmetry among young football players     

José Guilherme  Júlio Garganta  Amândio Graça  André Seabra 《Journal of sports sciences》2015,33(17):1790-1798

The functional asymmetry of the lower limbs has been regarded as a relevant factor of the performance of football players. We purposed to ascertain whether a specific technical training programme for the non-preferred foot has implications in the increasing utilisation rate of the respective member during the game. Young football players (n = 71) were randomly divided into experimental group (N = 35; 14.37 ± 1.94 years) and control group (N = 36; 14.50 ± 1.81 years). The study was developed into three stages: first, assessment of the index utilisation of both limbs during the game; second, application of a technical training programme that includes the drilling of specific motor skills exclusively directed to the non-preferred foot; and third, assessment of the new rate of both limbs’ utilisation after the predefined six months. The main findings were: (1) the use of the non-preferred foot increased significantly with the technical training programme in the experimental group and remained constant in the control group; (2) the use of the preferred foot decreased significantly in the experimental group and remained similar in control group. We concluded that a systematic and specific technical training for the non-preferred foot increases its use and reduces functional asymmetry in game situation, consequently improving the player’s performance.  相似文献   

信息不对称条件下的企业招聘风险分析   总被引：11，自引：0，他引：11  

何会涛 《科技与管理》2005,7(6):47-49

正确的招聘决策有赖于对应聘者信息的充分掌握，在招聘这个动态博弈的过程中，由于信息不对称的存在，应聘者为了追求自身利益最大化，必然会存在伪装现象，这种伪装现象就会造成“逆选择”及企业招聘的风险存在。在信息不对称条件下，企业招聘风险的规避必须加强信息的透明度和伪装现象的惩罚力度。  相似文献   

Moho面和上地幔间断面大尺度地形起伏的低阶球谐分析   总被引：2，自引：0，他引：2  

何小波  周蕙兰 《中国科学院研究生院学报》2005,22(3):315-321

对全球地形高程和Moho面深度 (CRUST2 0模型 )及上地幔各间断面深度数据进行了球谐分析 .在此基础上 ,通过叠加前 4阶模式得到了各类数据的空间大尺度分布信息 ,通过叠加振幅平方值最大的 4项得到了各类数据的空间主能量分布 .结果表明 ,Moho面和‘41 0’间断面的地形存在半球尺度的大尺度非对称性 ,而且南北半球非对称性比东西半球的更显著 ;而‘5 2 0’和‘660’间断面的地形起伏已没有半球尺度那么大的非对称性 ,而是尺度略小些的不对称性 .  相似文献   

网上拍卖中由信息不对称导致的问题及对策     

宁恬 《商洛学院学报》2006,20(4):100-104

通过对网上拍卖中由信息不对称导致的问题进行深入研究，进而对现有的信用评价机制进行优缺分析并提出解决对策。首先对网上拍卖理论进行介绍；其次，对信息不对称在网上拍卖中表现出的新形式及特殊性进行论述；再次，对信息不对称下网上拍卖交易双方面临的新问题进行分析，并提出必须建立合理的信用约束机制才能避免问题的产生；最后，以易趣网的信用评价体系为例介绍现有的信用评价机制，分析其中的不足并提出改进策略。  相似文献   

从感叹句、wh-问句不对称现象看CP分裂假说     

章进培 《怀化学院学报》2007,26(9):81-83

wh-感叹句与wh-问句在助动词移位、wh-短语作主语方面存在不对称现象。根据Rizzi提出的CP分裂假说,认为中心语所具有的不可诠释特征不同是造成上述差异的主要原因,并提出一种新的模型来解释上述两种不对称现象,从而避免了用单一CP解释而带来的缺陷。  相似文献   

中国金融发展的不对称性：基于省际面板数据分析     

唐丁祥  王元凯 《未来与发展》2010,(9):49-53

金融发展与经济增长的关系是研究中国金融发展的首要问题。地区差异是中国经济发展的显著特点,有必要将地区差异纳入中国金融发展的研究中。根据省级面板数据,本文认为,中国金融发展与经济增长存在作用强度不对称性与地区作用不对称性。这为制定金融发展政策与区域发展政策提供依据。  相似文献   

An Investigation Into Handedness and Choking Under Pressure in Sport     

Christopher Mesagno  Jacob Garvey  Stephanie J. Tibbert  Peter Gröpel 《Research quarterly for exercise and sport》2019,90(2):217-226

When athletes fail to perform at an expected level during an important moment, it is implied the athletes have experienced “choking“ (sudden decline in performance) under pressure.”. Researchers have reported that persistent left-hemispheric activation patterns occur when an athlete experiences considerable performance deteriorations under pressure. Researchers have also observed differences in brain activation patterns between left- and right-handed people on a variety of physical and cognitive tests, with the left-hemispheric activation more pronounced in right-handed participants. Purpose: The purpose of this study was to investigate whether athletes’ handedness may be linked to choking susceptibility (i.e., likelihood to experience performance decline under pressure). Method: Twenty right-handed and 13 left-handed experienced Australian football players completed 15 shot attempts, in both a low-pressure and a high-pressure condition. Both groups displayed equal state anxiety increases due to the pressure manipulation, indicating similar increases in anxiety in both handedness groups. Results: Differences were indicated in performance between the left- and right-handed groups during the high-pressure condition, with the left-handed group maintaining, and the right-handed participants declining, performance. Conclusion: Future electroencephalogram (EEG) research investigating this link may clarify the effect between handedness and choking.  相似文献   

组织腐败的经济学诠释     

刘宏斌 《湖南师范大学社会科学学报》2006,35(2):89-92

从制度经济学的角度分析组织腐败问题,可以看出信息不对称、团队卸责和分权悖论是组织腐败形成的内生因素,而政治体制与政治文化的缺陷、委托一代理理论揭示的监督机制失灵和社会转型期规则变迁的特殊性则为组织腐败的产生提供了外部社会条件。克服组织腐败必须从组织设计和制度安排上着手。  相似文献   

浅谈风险投资中委托-代理风险的防范     

段逆 《科技创业月刊》2007,20(3):52-53

由于风险投资中存在着信息不对称,从而造成风险投资家和风险企业之间签约之前的“逆向选择”和签约之后的“道德风险”问题。探讨了这种委托—代理风险的防范措施,并且简要分析了我国目前实施此类措施中应该注意的问题。  相似文献   

A computational method for analysis of underwater dolphin kick hydrodynamics in human swimming     

Alfred Von Loebbecke  Russell Mark  James Hahn 《Sports biomechanics / International Society of Biomechanics in Sports》2013,12(1):60-77

We present a new method that combines the use of laser body scans, underwater video footage, software-based animation, and a fully unsteady computational fluid dynamics technique to simulate and examine the hydrodynamics of the dolphin kick. The focus of the current work is to model this particular stroke in all its complexity with minimal ad-hoc assumptions or simplifications. Simulations of one female and one male swimmer (both at about 1.7 m beneath the water surface) at velocities of 0.95 and 1.31 m/s and Strouhal numbers of 1.21 and 1.06 respectively are presented. Vorticity and fluid velocity profiles in the wake are examined in detail for both swimmers. A three-dimensional vortex ring is clearly identified in the wake for one of the cases and a two-dimensional slice through the ring corroborates previous experiments of Miwa et al. (2006). We also find that most of the thrust is produced by the feet and in both cases the down-kick produces much larger thrust than the up-kick.  相似文献