Biomechanics of judo backward breakfall for different throwing techniques in novice judokas     

Sentaro Koshida  Takanori Ishii  Tadamitsu Matsuda  Toshihiko Hashimoto 《European Journal of Sport Science》2017,17(4):417-424

It is generally accepted that proper learning of the breakfall technique during early judo training is essential for attenuating the risk of judo-related head injury. Therefore, it is critical to understand the kinematics and head injury risks of breakfall motion to design a more safe and effective judo teaching paradigm that results in reduction of injury risk. We aimed to investigate the biomechanics of judo backward breakfalls by comparing osoto-gari and ouchi-gari in novice judokas. Twelve male novice judokas (age: 21.3 years, SD?=?0.6 years; height: 1.74?m, SD?=?0.04?m; body weight: 71.3, SD?=?6.4?kg; body mass index: 23.5, SD?=?2.3) volunteered to participate in this study. The kinematic data of the breakfall motion for both osoto-gari and ouchi-gari were collected using a three-dimensional motion analysis technique (200?Hz). We observed significant differences between the movement patterns for the two techniques, especially in the lower extremity movements. In addition, a significantly greater peak extension momentum (osoto-gari: 1.29, SD?=?0.23?kg?m^2?s^?1; ouchi-gari: 0.84, SD?=?0.29?kg?m^2?s^?1) and lower head position along the vertical axis (osoto-gari: 0.18, SD?=?0.05?m; ouchi-gari: 0.31, SD?=?0.08?m) with a large effect size were found in the breakfall for osoto-gari. Our results suggest that a different paradigm is needed for effectively teaching each breakfall technique that will enable us to substantially lower the risk of judo-related head injuries in novice judokas.  相似文献   

农科院校无机及分析化学课程分层教学方法的应用   总被引：1，自引：0，他引：1  

刘威  龚淑华  刘晓瑭 《高教论坛》2011,(1):68-70

针对扩招后学生水平差异的显著,根据最近发展区理论,在我校《无机及分析化学》基础课教学中进行分层教学法的实践,按能力对学生进行分组,同时设计多层次的教学目标,有针对有区别地设计教学内容,控制教学进度,促进每个学生在最适合自己的目标层次中求得最佳发展,从而改进传统的大班"一刀切"的授课方式,强化学生的主体地位,有效地提高《无机及分析化学》大班教学的质量,更好地实现扩招后"大众化""多元化"的教育目标。  相似文献   

Test Development with Performance Standards and Achievement Growth in Mind     

Steve Ferrara  Dubravka Svetina  Sylvia Skucha  Anne H. Davidson 《Educational Measurement》2011,30(4):3-15

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从理论宣传角度审视五四时期“问题与主义”之争     

葛传根 《信阳师范学院学报(哲学社会科学版)》2011,(3):11-14

20世纪初的＂问题与主义＂之争早已尘埃落定,但它所警告的教条主义空谈理论的危险并没有随之消失。＂问题与主义＂之争中提出的宣传＂主义＂和＂学理＂的方法,对我们今天的理论宣传仍有很大启发。  相似文献   

The Analysis of Chapter One of Pride and Prejudice——Via Material Processes and Relational Processes     

赵晶 《环球赛鸽科技》2015,(8)

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高等数学课程思政案例教学探讨     

蒋艳  钟艳  黄爱武 《科教文汇》2021,(9)

该文以湖南中医药大学开设的高等数学课程为例,结合当今社会热点挖掘课程蕴含的思政元素,以定积分的概念、可分离变量微分方程的应用两个教学案例为载体,重点探讨了高等数学与思政教学的有机融合,最后给教师队伍的建设提出一些建议。  相似文献   

运动休闲步道管理国际模式研究     

刘丽霞 《广州体育学院学报》2019,(2):71-73

随着休闲经济的兴起，运动休闲理念和诸多休闲运动项目也被传播到中国，徒步运动以其健身性、自然性和冒险性的特点，深受世界人民喜爱，今年来已在中国大地慢慢流行开来。与西方国家相比，中国的步道拥有量少得可怜，急需建设大量步道以满足日益增长的徒步爱好者的需求，同时，步道规划、建设、管理成为运动休闲管理的新课题。西方国家的步道管理已有逾百年的经验，其核心要点就是，步道依自然条件而建，尽量突出其自然、野外的特点，尽量减少人工土木的痕迹；在管理上应突出健康性、公益性、环保性的特点；要重视步道建设、管理对运动休闲产业的拉动作用。  相似文献   

Screening for risk of low energy availability in athletic and recreationally active females in Ireland     

Danielle M. Logue  Sharon M. Madigan  Mirjam Heinen  Sarah-Jane McDonnell  Eamonn Delahunt  Clare A. Corish 《European Journal of Sport Science》2019,19(1):112-122

ABSTRACT

Introduction: Low energy availability (LEA) results in physiological adaptations, which can contribute to unfavourable health outcomes. Little information exists on risk of LEA in active individuals competing in different sports or levels of competition. The aims of this study were to (1) identify risk of LEA in females competing at different levels of competition and (2) investigate associations between risk of LEA, illness and dietary habits. Methods: The validated questionnaire, ‘Low Energy Availability in Females Questionnaire’ was distributed online (November 2016–February 2017) to assess risk of LEA. Twenty-nine additional questions collected information on demographics, illness history and dietary habits. Participants were considered at risk of LEA if they attained a score of?≥?8 and were grouped into: (i) international; (ii) provincial/inter-county; (iii) competitive; and (iv) recreationally active. Chi-square and logistic regression analyses were used to explore differences between those at risk or not at risk of LEA. Results: Risk of LEA was identified in 40% (n?=?331) of 833 participants and was 1.7 and 1.8 times more likely in international and provincial/inter-county athletes compared to those who were recreationally active (International: odds ratios (OR) 1.68, 95% confidence intervals (95%CI) 1.12–2.54; Provincial/inter-county: OR 1.83, 95%CI 1.20–2.77). In participants at risk of LEA, missing >22 days of training during the previous year due to illness occurred 3 times more frequently (OR 3.01, 95%CI 1.81–5.02). Conclusion: Risk of LEA was widespread in this heterogeneous sample. Awareness of LEA and the development of appropriate energy management strategies to ensure athlete health across levels of competition are required.  相似文献   

危机与应对:新型冠状病毒肺炎疫情下的中国体育叙事     

孙科  郇昌店  任慧涛  闫士展  纪成龙  张震  王永顺 《上海体育学院学报》2020,(5):1-15,46

新型冠状病毒肺炎疫情(以下简称"疫情")下的体育叙事,不仅要阐发疫情期间体育事件及其社会意义,更应揭示不同体育要素在社会发展中的功能与作用,将对体育现实问题的思考转化为未来体育转型的应对策略。基于叙事的角度,以访谈的方式,探讨体育产业发展、东京奥运会延期、体育组织治理、奥运备战、居家体育、体育在线教学、体育中考等热点事件和话题。认为:①疫情对体育产业的影响呈现持续性、结构性、社会性等特征,在"转危为机"的话语下,应借助政府的积极行为,实现体育行业与体育产业的多层次融合,增强对消费端的刺激,提高体育企业的抗风险能力,最大程度地释放后疫情时代体育产业发展动力;②东京奥运会延期举办凸显国际奥委会内部治理的困境与危机,引发对中国体育赛事治理效能的思考,给奥运备战带来挑战,促使运动训练由传统化模式向集群化工业模式转变;③空间重叠与权力空间渗透造就居家体育的特殊"脱域"空间,成为"家庭-学校-社区"体育互动发展的催化剂,引发体育教学、社区体育、群众体育活动方式的改变,形成自觉行为更高的群众体育"在地化"驱动模式;④在疫情防控期间,体育话语在不同语境中的表达、转型与辩驳为体育话语转为文化资源提供契机,促进文化与体育的互动与整合,深刻影响人们的体育观念。  相似文献   

现代探险性运动休闲对我国运动休闲产业的启示     

张〓璐 《广州体育学院学报》2019,(1):74-77

人类的探险行为从工作所需演变为今天的探险运动，它折射着人类自身发展的脚步，也预示着人类未来生活的追求。当今的人们不需要去真正探险，但探险性运动休闲在满足人们探险的好奇心的同时，也提供给人们一种高品质的休闲方式，它是未来运动休闲的主方向，当然也就是运动休闲产业发展的主题。我国运动休闲产业历经多年发展而仍然处于边缘状态，探险性运动休闲则可以成为未来我国运动休闲产业发展的突破口。  相似文献