The dynamic control ratio at the equilibrium point (DCRe): introducing relative and absolute reliability scores     

Tobias Alt  Axel J. Knicker  Heiko K. Strüder 《Journal of sports sciences》2017,35(7):688-693

Analytical methods to assess thigh muscle balance need to provide reliable data to allow meaningful interpretation. However, reproducibility of the dynamic control ratio at the equilibrium point has not been evaluated yet. Therefore, the aim of this study was to compare relative and absolute reliability indices of its angle and moment values with conventional and functional hamstring–quadriceps ratios. Furthermore, effects of familiarisation and angular velocity on reproducibility were analysed. A number of 33 male volunteers participated in 3 identical test sessions. Peak moments (PMs) were determined unilaterally during maximum concentric and eccentric knee flexion (prone) and extension (supine position) at 0.53, 1.57 and 2.62 rad · s^–1. A repeated measure, ANOVA, confirmed systematic bias. Intra-class correlation coefficients and standard errors of measurement indicated relative and absolute reliability. Correlation coefficients were averaged over respective factors and tested for significant differences. All balance scores showed comparable low-to-moderate relative (<0.8–0.9) and good absolute reliability (<10%). Relative reproducibility of dynamic control equilibrium parameters augmented with increasing angular velocity, but not with familiarisation. At 2.62 rad · s^–1, high (moment: 0.906) to moderate (angle: 0.833) relative reliability scores with accordingly high absolute indices (4.9% and 6.4%) became apparent. Thus, the dynamic control equilibrium is an equivalent method for the reliable assessment of thigh muscle balance.  相似文献   

城市高龄老人肌力、柔韧、平衡能力的分析——以南京市城区老龄人口为例   总被引：1，自引：0，他引：1  

陈晓霞  张建国  刘波  施启蓉  赵尔邦  孔伟强  坂部创一 《成都体育学院学报》2010,36(1)

通过调查测定544名70岁以上南京市城市高龄老人身体机能的部分指标,结果表明:南京市城市高龄老人的肌力、柔韧性、平衡能力等均处于一个较低的水平,并且在70岁高龄之后各项机能指标仍然呈现下降的趋势.有运动习惯者在握力以及柔韧性方面优于无运动习惯者.  相似文献   

New Structures,New Strategies: CSIRO’s Changing Role in Australian Innovation     

《普罗米修斯》2012,30(2):141-152

Abstract

CSIRO’s role in Australian innovation has evolved over the years in response to changes in the external environment and within Australia’s national innovation system. The process of organisational change has been characterised by a series of restructurings—in 1978, 1988, 1996 and 2001—and accompanying shifts in the organisation’s strategic directions. In this paper we look at the process of organisational change in an historical context, looking at the evolving external environment, the legislative and management background, and the shifts in the organisation’s strategic directions. The change process is interpreted from a punctuated equilibrium perspective. We propose that discontinuous, rather than continuous change, is the way that a complex and diversified organisation like CSIRO adjusts to a changing external environment and, moreover, that independent public reviews have an important role in this process. In the light of major changes in the Australian and scientific landscapes over the past two decades we suggest it is time to look again at CSIRO’s role and the sustainability of its internal management arrangements.  相似文献   

Motor control of practice and actual strokes by professional and amateur golfers differ but feature a distance-dependent control strategy     

《European Journal of Sport Science》2013,13(9):1204-1213

Abstract

We explored how practice and actual putting strokes differed between professionals and high-level golf amateurs, and how practice strokes reflected subtle differences in putting distances. We analysed swing amplitude, impact velocity, and acceleration profile of the club-head. The acceleration profiles showed that the motor control pattern of the practice stroke differed from that of the actual stroke. To clarify the effects of different putting distances on the practice stroke and to analyse how much the actual stroke could be explained by the practice stroke, we conducted individual regression analyses. The practice strokes of all participants could be divided into three strategies and five types by the coefficient of determination and the slope. This implies that the purpose of the practice stroke varied among golfers. Most golfers used the individual velocity criteria in their practice strokes, which resulted in different putting distances based on their criteria. Unexpectedly, we found no significant difference in skill level between professionals and high-level amateurs. The results of this study imply that the practice stroke does not duplicate the actual stroke, even for professional golfers with excellent skills. However, most high-level golfers adopted distance-dependent control strategies for slightly different putting distances.  相似文献   

国际田联《男子十项全能评分表》修改初探   总被引：2，自引：1，他引：1  

刘学贞  刘卉  李世明 《北京体育大学学报》2002,25(5):644-646,655

全能评分表不仅是评定运动员成绩的非常重要的依据,而且对全能运动的训练也起着十分重要的作用.国际田联公布的全能评分表,存在着一些问题,包括:起点、终点是否合适,各项评分是否累进;各项评分之间是否平衡.主要采用变参数曲线拟合法对国际田联<男子十项全能评分表>进行改进,并适当修改原评分表的起点、终点,使新评分表各项得分更加均衡、合理.  相似文献   

具有Z_8-等变性质的平面七次哈密顿向量场的一般形式及其相图（英文）     

李艳梅 《楚雄师专学报》2010,(12):32-35

本文给出了具有Z8-等变性质的七次平面哈密顿向量场的一般形式,并给出了部分相图。  相似文献   

异核两组分玻色-爱因斯坦凝聚体中矢量孤子的动力学性质     

冯雪霖  张素英 《雁北师范学院学报》2014,(2):33-38

本文基于准一维异核两组分玻色-爱因斯坦凝聚体的Gross-Pitaevskii（GP）方程,通过数值方法研究了亮-亮孤子和亮-暗孤子在不同的相对相位下的碰撞问题。没有外部势阱的束缚时,若亮-亮孤子的相对相位是π,它们会产生完全弹性碰撞,当相对相位是π2时亮-亮孤子对碰撞会产生能量的转移。若存在外部势阱,其相对相位为π时亮-亮孤子对产生了周期性碰撞,而相对相位是π2时亮-亮孤子对碰撞合并成一个孤子,并伴随有能量逃逸。对于亮-暗孤子,其相对相位为0或π时第一组分的亮-亮孤子对均发生了周期性碰撞,不同的是前者有一个碰撞点,后者则有两个碰撞点。进而,通过求解相应的Bogoliubov-de Gennes方程研究发现亮-亮孤子总是稳定的,而暗-暗孤子不稳定。  相似文献   

转型期多元利益的协调与均衡：构建和谐社会的关键     

童隽 《锦州师范学院学报(哲学社会科学版)》2007,29(1):95-98

随着我国社会的转型和体制的转轨，人们之间的利益分化日益明显，利益矛盾和利益冲突也日渐突出，我国开始进入了利益博弈时期。我们要在改革进程中协调多元利益关系，必须要通过建立健全畅通的利益表达机制和公正的利益均衡机制，确保社会各阶层都能从改革和发展中实现收入和福利的增进，这将是构建社会主义和谐社会的关键。  相似文献   

均衡理论的视角：取消“五一”黄金周的相关问题及对策探讨     

胡号寰  胡贤修 《荆州师范学院学报》2007,30(6):73-75

以黄金周为单位的长假旅游通过集中休假的方式拉动消费，在改变国人休闲观念的同时，给交通、旅游部门带来了巨大压力，并造成长假前后消费萧条等问题。现拟取消“五一”黄金周，增加传统节日。从均衡理论来看，节日调整利大于弊。因此，应针对节日调整后可能出现的问题，寻求对策，引导假日旅游消费健康发展。  相似文献   

饲料中盐酸克伦特罗的快速分离柱高效液相色谱法测定     

朱慧贤  章新  王林  吴献花  胡秋芬 《玉溪师范学院学报》2007,23(3):53-56

研究了用快速分离柱高效液相色谱法测定饲料中盐酸克伦特罗的方法.饲料样品中的盐酸克伦特罗用水超声振荡提取,然后用固相萃取预分离和富集,以ZORBAX Stable Bound(4.6×50 mm,1.8μm)C18快速分离柱为固定相,0.01 mol/L的磷酸二氢钾水溶液∶甲醇=65∶35为流动相分离,流速为2.0 mL/m in;在该色谱条件下,盐酸克伦特罗在1.0 m in内可达到基线分离.该方法的标准回收率为89%~94%,相对标准偏差为1.5%~2.2%.将该方法用于几种饲料样品的测定,结果令人满意.  相似文献