Overtraining/Overreaching: Leptin and Ghrelin in Male Recruits

Background In many sports, athletes with low body weight and/or low body fat content have a distinct advantage over their opponents. Such an advantage can easily turn into a noticeable disadvantage because low body weight and ' leanness' may also be associated with health problems.     

Book Notices

Book Notices

Book Notices     

图书馆的四个文明

认为图书馆文明包括4个方面：①知识在媒体上的记忆储存;②知识媒体的再现流通与传递;③知识内容的参考与转介服务;④知识内涵与知识表现的管理。从文明性质、社会功能等方面对图书馆4个文明进行比较,指出在图书馆创建文明的同时,需及时解决伴随环境变化而衍生的各种矛盾。     

The Historical-Genetical Approach to Science Teaching at the Oberstufen-Kolleg,Bielefeld

The Oberstufen-Kolleg is a unique institution at the college level in Germany. Founded in the course of the German `Bildungsreform' during the 1960s, it develops and tries out interdisciplinary courses that aim at the understanding of science by integrating its history and philosophy with the development of society and technology. This paper describes the development of the `historical-genetical approach', its leading ideas, experiences of students and teachers with this approach and perspectives concerning a broader implementation. It also gives some examples how to combine learning of science with learning about science.     

网站图书馆:数位媒体与网域服务环境下的图书馆新型态

介绍1960～2010年资讯传播应用的发展状况，预测网站图书馆时代的来临;从图书馆馆藏角度阐述网站图书馆内涵布局的重要性;说明资料库与知识库是网站图书馆的核心典藏，也是传统图书馆书库媒体数位化的延伸;指出网站图书馆作为一个多度空间的图书馆服务网，将比传统图书馆释放更大的服务能量，发挥更重要的社会功能。     

Multidimensional joint coupling: a case study visualisation approach to movement coordination and variability

Abstract

A case study visualisation approach to examining the coordination and variability of multiple interacting segments is presented using a whole-body gymnastic skill as the task example. One elite male gymnast performed 10 trials of 10 longswings whilst three-dimensional locations of joint centres were tracked using a motion analysis system. Segment angles were used to define coupling between the arms and trunk, trunk and thighs and thighs and shanks. Rectified continuous relative phase profiles for each interacting couple for 80 longswings were produced. Graphical representations of coordination couplings are presented that include the traditional single coupling, followed by the relational dynamics of two couplings and finally three couplings simultaneously plotted. This method highlights the power of visualisation of movement dynamics and identifies properties of the global interacting segmental couplings that a more formal analysis may not reveal. Visualisation precedes and informs the appropriate qualitative and quantitative analysis of the dynamics.