Acute effects of different warm-up protocols on highly skilled golfers’ drive performance     

Ben L. Langdown  Jack E.T. Wells  Sean Graham  Matt W. Bridge 《Journal of sports sciences》2019,37(6):656-664

Previous research has highlighted the positive effect that different warm-up protocols have on golf performance (e.g. Sorbie et al., 2016; Tilley & Macfarlane, 2012) with the design of warm-ups and programmes targeting and improving golf performance through the activation and development of specific muscle groups. This study aimed to examine the acute effects of two warm-up protocols on golf drive performance in comparison to a control condition. Using a randomised counterbalanced design over three testing sessions, twenty-three highly skilled golfers completed the control, dynamic and resistance-band warm-up conditions. Following each condition, a GC2 launch monitor was used to record ball velocity and other launch parameters of ten shots hit with the participants’ own driver. A repeated-measures ANOVA found significant increases in ball velocity (η_p² = .217) between the control and both the dynamic and resistance-band warm-up conditions but no difference between these latter two, and a reduction in launch angle between control and dynamic conditions. The use of either a dynamic stretching or resistance-band warm-up can have acute benefits on ball velocity but golfers should liaise with a PGA Professional golf coach to effectively integrate this into their golf driving performance.  相似文献   

论信托财产物权保护模式的构建     

吴至诚 《江苏经贸职业技术学院学报》2011,(3):32-35

我国作为大体沿袭大陆法系立法的国家,在信托法与物权法的衔接上存在着物权请求权的唯一性与对受益人保护的衡平这二者之间的矛盾。其解决方式就是确定信托财产上物权请求权的归属以及给予非信托财产所有权人以物权的保护方式。  相似文献   

一种单列角接触球轴承的设计     

杜少杰  任小中 《安阳工学院学报》2016,15(4)

角接触球轴承的设计涉及许多结构参数。着重介绍了角接触球轴承的钢球、内外套圈等零件主要参数的确定。基于用户要求,运用ZYB28-98角接触轴承的设计方法,首先确定了所需要的钢球直径和钢球数,并计算了其径向额定负荷。接着详细介绍了内外沟曲率半径、内外圈沟径、内外圈挡边直径等主要参数的计算过程。  相似文献   

珍珠球运动在我省发展现状及策略研究     

关辉 《哈尔滨学院学报》2011,32(8):137-140

珍珠球运动是我国满族人民的传统体育项目,是由模仿满族人民采珍珠的劳动演变而来。黑龙江省是满族人民聚居地之一,珍珠球运动也有着一定的群众基础。文章通过对黑龙江省最近几届民族传统体育运动会珍珠球竞赛的分析,结合作者多年来从事珍珠球运动教学训练及裁判工作的经验,对珍珠球运动在我省的发展现状及策略提出自己的观点。  相似文献   

Dynamic Stability Analysis of Cages in High-Speed Oil-Lubricated Angular Contact Ball Bearings     

刘秀海  邓四二  滕弘飞 《天津大学学报(英文版)》2011,17(1):20-27

To investigate the cage stability of high-speed oil-lubricated angular contact ball bearings, a dynamic model of cages is developed on the basis of Gupta’s and Meeks’ work. The model can simulate the cage motion under oil lubrication with all six degrees of freedom. Particularly, the model introduces oil-film damping and hysteresis damping, and deals with the collision contact as imperfect elastic contact. In addition, the effects of inner ring rotational speed, the ratio of pocket clearance to guiding clearance and applied load on the cage stability are investigated by simulating the cage motion with the model. The results can provide a theoretical basis for the design of ball bearing parameters.  相似文献   

Cooperative learning and dyadic interactions: two modes of knowledge construction in socio-constructivist settings for team-sport teaching     

Florence Darnis  Lucile Lafont 《Physical Education & Sport Pedagogy》2015,20(5):459-473

Background: Within a socio-constructivist perspective, this study is situated at the crossroads of three theoretical approaches. First, it is based upon team sport and the tactical act model in games teaching. Second, it took place in dyadic or small group learning conditions with verbal interaction. Furthermore, these interventions were based on cooperative learning (CL) models. The cultural context is the French school curriculum, so it emphasizes the role of sports as social practice and uses the applied concept of French didactic transposition. It took place in a socio-constructivist perspective of the teaching-learning process and extends the notion of debate-of-idea.

Purpose: This article explores the role of CL in a Physical Education (PE) classroom setting and particularly the role of verbal exchanges among peers in team-sport teaching.

Research design: This article reports two interventions. The first study showed the positive effects of discussions within a team in an adapted basketball game. Seventeen boys and 13 girls from a French school (third and fourth grades), all novices in basketball, were assigned to two independent groups of a two (Learning condition) design. Dependent measures included collective game efficacy and individual skill levels. A second study concerned an instructional setting of a handball team game (two attackers against a defender in each half of the ground) with 11–12-year-old girls. Two groups were constituted by learning condition: symmetrical versus dissymmetrical dyads.

Data collection and analysis: During PE lessons, verbal interactions were filmed and recorded for the two studies. Matches were filmed in study 1, while data in study 2 were collected by an expert on an observation worksheet. ANOVA were conducted in both studies.

Results: The two studies showed that oral discussions between peers about the goal and the strategies of the game facilitated the development of motor and tactical skills. The second study showed the superiority of a slightly dissymmetric dyadic condition. The low-skilled pupils in dissymmetrical dyads obtained more benefit from the verbal interactions than those in a symmetrical setting. In the dissymmetrical condition, while the initially low-skilled participants had the highest rate of progression, the initially high-skilled players had to explain their solution and could also benefit from the dyadic interaction.

Conclusion: In both studies, action rules were constructed by peers' verbal exchanges in a reflective way. In a PE socio-constructivist setting, the teaching of games facilitates mutual aid, social relationships, and participation in community activities.  相似文献   

浅谈足球运动员不同踢球技术踢定位球的技术特点     

郭尼 《搏击·武术科学》2015,(4):109-111

足球被誉为世界第一运动,是因为它具有参加的人数多、分布广、易展开等特点,深受广大人群的喜爱。足球在高校中已经成为大学生选修课和普修课以及课余锻炼的主要内容,踢球是指运动员有目的地用脚将球击向预定目标的动作方法。踢球是运动员进行比赛活动的主要技术手段,它在比赛中的主要用途是射门和传球。文章运用文献资料法、逻辑分析法等方法,针对足球运动员在踢定位球教学与训练中存在的问题以及结合踢球技术的特点进行分析与探讨,进而综合不同踢球技术踢定位球的技术特点,目的在于通过理论指导实践,使足球技术教学及训练更加科学、系统。  相似文献   

相持阶段网球运动员击球线路的知觉预判研究     

上官戎  范伟 《湖南师范大学教育科学学报》2015,(3):120-123

考察网球运动员在比赛相持阶段对击球线路预判的行为学特征。实验采用E-Prime技术呈现网球比赛相持阶段视频,被试的任务是做直线或斜线判断。结果发现,专家组被试在直线和斜线的判断上正确率高于新手组,反应时比新手组短;专家组在斜线判断上正确率和反应时都显著好于直线判断,而新手组在斜线、直线判断上不存在差异。结果表明,专家组网球选手在比赛相持阶段预判击球线路时能及早把握时机,行为特征表现快又准确,对击球线路的预判能力更强。  相似文献   

文化视野下的我国三大球发展困境及其出路     

王建伟  黄继珍 《广州体育学院学报》2016,(6):68-73

在文化视角下对我国三大球的发展困境及其出路进行了回眸与反思。提出文化视野下我国三大球的发展困境主要体现在，精神文化层面：“金牌战略”的核心价值理念错误引导、我国传统文化思想的束缚、三大球文化创新意识和能力缺乏；制度文化层面：举国体制的时效性下降、人才培养模式单一、行政管理体制存在弊端；物质文化层面：三大球联赛职业化水平低、专业队伍建设及后备人才匮乏、教练员数量和质量限制。三大球的发展出路体现在精神文化层面培养政府和民众的三大球精神文化自觉意识；制度文化层面通过制度创新激活三大球自主创新的活力；物质文化层面推进三大球的市场化、职业化与产业化进程，凝聚复兴的物质力量。  相似文献   

Small Nation,Big Sport: Basque Ball – Its Past and Present Cultural Meanings for the Basques     

Bartosz Prabucki 《国际体育史杂志》2017,34(10):943-956

Abstract

The Basques are a nation living in the Basque Country – a territory that is divided between two states – France and Spain. Isolated in the mountainous terrain they have preserved their original culture and collective identity. However, they still need to struggle for recognition, using some elements of their own culture to promote their identity and reject their status as a peripheral region of Spain or France. One of such elements is sport, especially so-called ‘traditional sports’ which this nation has preserved over centuries. The aim of this paper is thus to analyze one example of such a sport – Basque ball and its historical and present situation, connections with other elements of culture and its socio-cultural importance for the Basques.  相似文献