New curve sprint test for soccer players: Reliability and relationship with linear sprint     

Alberto Fílter  Jesús Olivares  Alfredo Santalla  Fabio Y. Nakamura  Irineu Loturco  Bernardo Requena 《Journal of sports sciences》2020,38(11-12):1320-1325

ABSTRACT

The speed performance is involved not only in linear sprints, but also in a wide spectrum of multi-directional movements, such as curve sprinting. Curved sprint can be defined as sprint with gradual and continuous change of direction (COD). Although ~85% of the actions performed at maximum velocity in a professional soccer league are curvilinear sprints, there is not any specific test to assess this ability. This study aimed to analyse the reliability of a new curve sprint test, and compare its results with those obtained by soccer players in linear sprint. Forty experienced soccer players performed 3 attempts of curve sprint (using the penalty arc) to right and left side (17 m), and 3 linear sprints (17 m) in two different days. The ICCs (inter-session reliability) were 0.93 for sprint curve right side (CSRS) and 0.89 for sprint curve left side (CSLS), considered “acceptable”. The CVs (intra-session reliability) were 0.87% in CSRS and 1.15% in CSLS. The coefficient of determination (R²) between linear and curve sprinting was ~35%. The association between curve sides was “very large” (r = 0.878; p < 0.01). In summary, we showed that “curve sprint test” is highly reliable, and that curvilinear and linear sprints are different and independent actions.  相似文献   

Problems and Perspectives of a Theory of Transformational Processes of Bildung     

Hans-Christoph Koller 《Educational theory》2020,70(5):633-651

In this essay, Hans-Christoph Koller presents a concept of transformational processes of Bildung in an attempt to redefine the German notion of Bildung referring to actual social conditions of educational processes. According to this conception, Bildung is a transformation of world- and self-relations that can come about when subjects are confronted with problems for which they have no established routines of engagement. With reference to theories of Pierre Bourdieu, Bernhard Waldenfels, and Ulrich Oevermann, Koller looks for answers to three questions: (1) Which concepts and theories are able to adequately grasp the world- and self-relations of subjects going through processes of Bildung? (2) How can the problems that trigger processes of Bildung and that challenge subjects to transform be determined more precisely? (3) How exactly does the emergence of new figures of world- and self-relations take place when we “successfully” complete a process of Bildung? Finally, the essay concludes with an attempt to clarify the normative implications of this theory.  相似文献   

近10年中国新疆与中亚对外贸易依存性发展     

何书玲  杜宏茹 《中国科学院大学学报》2019,36(5):642-649

对中国新疆与中亚2005-2014年10年间对外贸易发展变化进行对比分析，研究在时间尺度上双方贸易额、贸易结合度、贸易差额及贸易发展环境的动态变化。结果表明：新疆对中亚国家贸易额逐年提升，在中国对中亚贸易中比例逐年下降；双方贸易结合度高，但结合度在逐年下降；新疆对中亚国家存在较大的贸易顺差，并且差额在持续扩大；新疆贸易发展环境优于中亚国家，近年双方贸易环境日趋转好。为进一步优化双方贸易，提出如下建议：加强新疆加工贸易的发展，提高进口原料的消化能力；加强新疆从中亚国家的进口工作，平衡双方贸易差额；积极推进双边自由贸易区的建设。  相似文献   

Evaluation of soccer players under the Moneyball concept     

Luiz Octávio Gavião  Annibal Parracho Sant’Anna  Gilson Brito Alves Lima  Pauli Adriano de Almada Garcia 《Journal of sports sciences》2020,38(11-12):1221-1247

ABSTRACT

The recruitment of athletes with limited resources is a global problem in professional sports. In US Major League Baseball, the experience of the Oakland Athletics’ general manager in the last decade turned his “Moneyball” model into a synonym of quantitative analysis in the transfer market of baseball players. His strategy focused on hiring players with outstanding technical skills but relatively low market value. This study adapted this model to the framework of a multiple criteria decision aid (MCDA), by selecting undervalued players who have complementary abilities. The novelty here refers to the joint use of four algorithms explored by the composition of probabilistic preferences (CPP) (i.e., ranking, classification, dynamic evaluation and regularity analysis) and their application to soccer player performance evaluation. The new model analysed the recent transfer of a left-back soccer player to Europe. The results indicated 12 opportunities for better investment, among 32 left and right-back players considered. Two years later, the value of the same player was considerably lower. He played only five matches in the 2018–2019 season, without scoring or providing any assists. On the other hand, the players better classified by the CPP-MB model presented higher performances and market values.  相似文献   

日本足球归化运动员的历史演进、运作逻辑与实践启示     

张大为  田胜国  刘兵 《沈阳体育学院学报》2020,(3):80-86,106

从历史演进视角对日本足球归化运动员进行研究,将归化演进历程分为业余足球主导期、职业足球改革探索期、职业足球稳定发展期3个阶段。归化运作逻辑体现:以技术足球理念为基准,合理实施归化行为;以填补位置短板为目的,提高国家队竞技水平;以保障职业角色转换为举措,营造良性发展氛围;以规避资源挤占矛盾为导向,逐步改变归化价值取向。启示:我国应厘清主体责任和发展理念,做好归化顶层设计;正视国家归化需求,消解文化融合与社会认同障碍;建立长效服务机制,扩大归化行为示范效应;把握足球运动规律,构建可持续发展模式。  相似文献   

浅析Authorware课件的播放问题及解决策略     

杨丽慧  许胜男 《承德师专学报》2014,(2)

针对Authoware作品在制作和播放过程中出现的特效无法正常显示;特殊字体的改变;视频播放不了等问题,提出了相应的解决方法。  相似文献   

职业外语能力的培养     

章国军 《深圳职业技术学院学报》2011,10(6):28-33

本文对职业外语能力进行了尝试性界定,指出语境在职业外语能力培养上的重要作用,并结合深圳职业技术学院正在进行的公共外语教学改革提出了培养职业外语能力的几条可行途径。  相似文献   

浅谈足球运动员技战术与体能训练的有机结合   总被引：1，自引：0，他引：1  

任慧一 《临沂师范学院学报》2001,23(4):91-92

足球比赛是双方运动员在技术、战术、体能、心理等方面的全面竞争。足球比赛中，技术、战术、体能的有机结合是制胜的决定性因素，且技术、战术、体能有机结合的训练有其设计要求。  相似文献   

母语与第二语言语感关系的认知阐释   总被引：1，自引：0，他引：1  

陶立军 《荆门职业技术学院学报》2008,23(10)

认知语言学为传统的语感研究提供了新的视角,图式理论对语感的生成及发展机制具有较强的解释力,将语感看做人们在接触大量的语言事实的基础上形成的一种认知结构,并可以作为认知理解新的言语信息的基础。文章运用图式及原型理论的原理对母语与第二语言语感的关系从认知角度进行阐释,指出母语的语感图式是典型的,占据语感范畴的中心地位,而第二语言的语感图式是非典型的、模糊的、边缘的,并由此对外语教学中语感培养的重要性及培养途径有所启示。  相似文献   

我国外汇储备规模影响因素分析     

马蓉  王怡雯 《兰州石化职业技术学院学报》2007,7(2):40-42

近年来我国国际收支持续顺差式的不平衡问题越来越为当局政府所重视,并明确提出将促进国际收支基本平衡作为保持宏观经济基本稳定的重要任务之一.从影响我国外汇规模因素出发,试图从数量分析的角度找出引起外汇规模扩张的主要因素,从而为有效控制外汇储备规模提出相关建议和对策.  相似文献