Fatigue increases ankle sprain risk in badminton players: A biomechanical study

ABSTRACT

Ankle sprains are the most common injury in regular badminton players and usually occur at the end of a match or training. The purpose of the present study was to examine the influence of fatigue produced by badminton practice on the lower limb biomechanics of badminton players. It was hypothesized that fatigue induces ankle kinematic and lower leg muscle activity changes which may increase the risk of ankle sprain. Ankle kinematics, ankle kinetics and muscles activities of 17 regular badminton players were recorded during lateral jumps before and after an intense badminton practice session. Post-fatigue, ankle inversion at foot strike and peak ankle inversion increased (+2.6°, p = 0.003 and +2.5°, p = 0.005, respectively). EMG pre-activation within 100 ms before foot landing significantly decreased after fatigue for soleus (?23.4%, p = 0.031), gastrocnemius lateralis (?12.2%, p = 0.035), gastrocnemius medialis (?23.3%, p = 0.047) and peroneus brevis (?17.4%, p = 0.036). These results demonstrate impaired biomechanics of badminton players when fatigue increases, which may cause a greater risk of experiencing an ankle sprain injury.     

The effects of school-based physical activity interventions on students' health-related fitness knowledge: A systematic review

This systematic review includes 34 studies examining the effects of school-based physical activity interventions on students' health-related fitness knowledge. The study design, methodological quality, and effectiveness of interventions on students' health-related fitness knowledge were analysed. The majority of the studies (79.4%) revealed significant positive intervention effects on students' health-related fitness knowledge. Studies examining adolescents were more frequently in a position to influence students' health-related fitness knowledge (87.5%) than studies examining children (75%), and studies with low methodological quality (88.8%) had more frequent positive effects than studies with moderate quality (75%). The effects on students' health-related fitness knowledge were independent of moderator variables such as the intervention content, duration and frequency. Only few studies were able to simultaneously positively influence students' health-related fitness knowledge and students' physical activity and/or fitness levels. These programmes can positively influence students' health-related fitness knowledge, but it remains unclear what the practical significance of these changes is. Further research is needed to clarify the influence of students' health-related fitness knowledge on reflection, understanding, physical activity behaviour, and overall physical literacy levels.     

“马克思主义基本原理”课程双语教学合理性分析

双语教学在大学兴起,而"马克思主义基本原理"课能否采用这一新形式则有诸多争议。鉴于学生实际情况、语言学习规律以及马克思主义理论特点,"马克思主义基本原理"双语教学具有必要性和正当性,能有效地提升学生英语水平、增强教学实效性和彰显马克思主义研究的学术性。     

TPR技术对钒系催化剂供氧活性和数目的研究

本文报导了利用TPR技术研究钒系催化剂的供氧活性和数目,从而阐明了TPD平衡法的可靠性.     

基于BP神经网络的大学生实践教学效果评价研究

实践教学是高等学校教学工作的重要组成部分,其中实践教学效果评价是保障高等学校实践教学质量的重要环节。针对高校大学生项目实践教学效果评价需求,构建项目实践教学效果评价指标体系,在此基础上设计调查问卷,利用网络问卷收集评价原始数据,通过Python进行数据预处理,并采用BP神经网络对某高校大学生项目实践教学效果实施评价,结果表明,该方法对于高校实践教学效果评价具有较强的实用性。     

艺术的情境之寓——文艺美学探微

情境者,情趣境界之谓也,主于美。它存在于艺术作品中,也存在于整个艺术审美活动中。艺术没有唯一的和绝对的摹本,也没有终级价值标准,有的便是一件件具体的作品和一次次具体的活动。一件作品就是一个独绝的情境,这情境是别人创造不出的,甚至创造者自己都是不能重复的。在此情境中,包括每一个细部,即使如绘画中的一处空白,音乐中的一个休止,小说中的一段铺垫,等等,便有着特别的意味,特别的美质。     

论文学功能系统与特质

传统的作品功能观把本视为学功能的发生源，把读视为学功能作用的被动对象，本提出：学功能必须在具体的学活动中才能产生，学活动是学功能的发生源。学功能联系于学活动的动态开放整体的流程，并对投身于学活动的一切实践主体（作与读）产生系统效能，学功能系统由认知，净化，愉悦，生命四个各具丰富内涵的子系统构成，并通过系统质的审美化合指向人本身，指向人自身的丰富与完善，指向人的诗意人生，因此，学功能是学之人学本义的回归。     

中国农村村委会的合法性研究——浙江省湖州市和孚镇荻港村的个案研究

任何政治权力系统都必须建立在权力合法性的基础之上,这是其存在、持续、发展和稳定的前提。农村是中国社会的基石,农村稳定是整个中国政权稳定的基础。我们选择湖州市和孚镇荻港村,对中国农村基层政权合法性这一问题进行实证个案研究。调查结果显示,现阶段荻港村村委会的合法性基础比较稳固,但在其发展过程中,必须对其合法性基础的变化予以关注,并随时准备进行合理的调整,防止出现合法性危机。     

高校学报体制改革实践——以《北京航空航天大学学报》为例

《北京航空航天大学学报》于2013年8月进行体制改革,采取学术与出版分离的办刊模式.文章以此为例,阐述实施方案、实践过程中的困难、解决措施,以及改革后的效果和变化,为探索更加科学有效的科技期刊改革方案提供参考.     

5-氨基四唑及其衍生物的合成和应用综述

文章综述了5-氨基四唑及其4种衍生物高氯酸.四氨.双(5-硝基四唑)合钴(Ⅲ)(BNCP)、3,6-双(l-氢-l,2,3,4-四唑-5-氨基)-l,2,4,5-四嗪(BTATz)、5-氨基四唑的Schiff碱、α-(5-四唑基)氨基烃基膦酸酯的合成、性质与应用.