Physiological characteristics of elite and sub-elite badminton players

Abstract

The aims of this study were to establish the physical and physiological attributes of elite and sub-elite Malaysian male badminton players and to determine whether these attributes discriminate elite players from sub-elite players. Measurements and tests of basic anthropometry, explosive power, anaerobic recovery capacity, badminton-specific movement agility, maximum strength, and aerobic capacity were conducted on two occasions, separated by at least one day. The elite (n = 12) and sub-elite (n = 12) players' characteristics were, respectively: mean age 24.6 years (s = 3.7) and 20.5 years (s = 0.7); mass 73.2 kg (s = 7.6) and 62.7 kg (s = 4.2); stature 1.76 m (s = 0.07) and 1.71 m (s = 0.05); body fat 12.5% (s = 4.8) and 9.5% (s = 3.4); estimated VO_2max 56.9 ml · kg^?1 · min^?1 (s = 3.7) and 59.5 ml · kg^?1 · min^?1 (s = 5.2). The elite players had greater maximum absolute strength in one-repetition maximum bench press (P = 0.015) compared with the sub-elite players. There were significant differences in instantaneous lower body power estimated from vertical jump height between the elite and sub-elite groups (P < 0.01). However, there was no significant difference between groups in shuttle run tests and on-court badminton-specific movement agility tests. Our results show that elite Malaysian male badminton players are taller, heavier, and stronger than their sub-elite counterparts. The test battery, however, did not allow us to discriminate between the elite and sub-elite players, suggesting that at the elite level tactical knowledge, technical skills, and psychological readiness could be of greater importance.     

Secondary School Art Teachers' Concepts of Teaching in Hong Kong

Recently, there has been considerable concern among art educators and cultural policy makers to promote art education in Hong Kong. The launch of the new curriculum of a discipline-based character in 1996 generated debate in the art education circle of Hong Kong. There were diverse opinions on the rationale for teaching art. Concern was expressed about the present constraints of art teaching related to teachers' ability and school administration poses another important issue that seems to inhibit further developments. This paper reports part of the findings of a study on art teachers' concepts of teaching. It explores the concepts of about 20 secondary art teachers in Hong Kong. Several categories of teaching are derived from interviews: aesthetic development, moral development, intellectual development, expression and therapy, and intellectual and aesthetic development. A scheme is developed which can be used to analyze teachers' concepts as education in or through art on a continuum from subject to learner centred.     

Implementation of School-Based Management: A Multi-Perspective Analysis of the Case of Hong Kong

The implementation of school-based management reform is a complicated process involving changes not only in structures and political relations but also in social interactions and cultural elements at both school and system levels. The lack of multi-perspectives in the analysis of school reforms sets a tight limitation on the understanding and implementation of school-based management. This paper aims to apply the structural perspective, the human resource perspective, the political perspective, and the cultural perspective to review and analyse the case of Hong Kong in implementing school-based management. It is hoped that the analysis of the Hong Kong case can provide an useful illustration of the application of multi-perspectives to support development of school-based management and draw useful implications for school reforms in both local and international contexts.     

Locating Self in the World: Elementary school children in Japan,Macau and Hong Kong

In the so-called 'global age', the issue of how children learn to locate themselves in the world is an important one. Working from a foundation of theories related to globalisation, identity development and citizenship education, this paper describes the findings of a research project which explored elementary school children's geographical and affective location of the self in Japan, Macau and Hong Kong. Analysis and discussion of Japanese education policy is then presented in an attempt to explain the finding that Japanese children are far less likely than their counterparts in Hong Kong and Macau to locate themselves in an international sphere.     

The Characteristics of Hong Kong School Principals' Leadership: The Influence of Societal Culture

This paper aims to identify the characteristics of principal leadership in Hong Kong. More specifically, it analyzes and integrates a number of studies to identify the consistency of principal leadership across the years and samples using a number of different leadership conceptions. These conceptions include both traditional and alternate approaches to educational leadership. The paper shows how societal culture and context combine with the principals' personal attributes to shape their school leadership. Findings indicate considerable diversity among Hong Kong principals even though they operate within the same social system. The paper stresses the importance of understanding culture and context if worthwhile leadership development programmes are to be developed.     

Dielectrophoretic manipulation of particles in a modified microfluidic H filter with multi-insulating blocks

The conventional microfluidic H filter is modified with multi-insulating blocks to achieve a flow-through manipulation and separation of microparticles. The device transports particles by exploiting electro-osmosis and electrophoresis, and manipulates particles by utilizing dielectrophoresis (DEP). Polydimethylsiloxane (PDMS) blocks fabricated in the main channel of the PDMS H filter induce a nonuniform electric field, which exerts a negative DEP force on the particles. The use of multi-insulating blocks not only enhances the DEP force generated, but it also increases the controllability of the motion of the particles, facilitating their manipulation and separation. Experiments were conducted to demonstrate the controlled flow direction of particles by adjusting the applied voltages and the separation of particles by size under two different input conditions, namely (i) a dc electric field mode and (ii) a combined ac and dc field mode. Numerical simulations elucidate the electrokinetic and hydrodynamic forces acting on a particle, with theoretically predicted particle trajectories in good agreement with those observed experimentally. In addition, the flow field was obtained experimentally with fluorescent tracer particles using the microparticle image velocimetry (μ-PIV) technique.     

Improvement of rectification effects in diffuser/nozzle structures with viscoelastic fluids

This paper reports the improvement of rectification effects in diffuser∕nozzle structures with viscoelastic fluids. Since rectification in a diffuser∕nozzle structure with Newtonian fluids is caused by inertial effects, micropumps based on this concept require a relatively high Reynolds numbers and high pumping frequencies. In applications with relatively low Reynolds numbers, anisotropic behavior can be achieved with viscoelastic effects. In our investigations, a solution of dilute polyethylene oxide was used as the viscoelastic fluid. A microfluidic device was fabricated in silicon using deep reactive ion etching. The microfluidic device consists of access ports for pressure measurement, and a series of ten diffuser∕nozzle structures. Measurements were carried out for diffuser∕nozzle structures with opening angles ranging from 15° to 60°. Flow visualization, pressure drop and diodicity of de-ionized water and the viscoelastic fluid were compared and discussed. The improvement of diodicity promises a simple pumping concept at low Reynolds numbers for lab-on-a-chip applications.     

The constructivist classroom learning environment and its associations with critical thinking ability of secondary school students in Liberal Studies

In this study, we investigated-secondary school students’ perceptions of their constructivist learning environment in Liberal Studies, and whether their perceptions were related to their critical thinking ability. A convenience sample of Secondary Three students (N = 967) studying Liberal Studies in Hong Kong participated in this research by completing a self-administered questionnaire which included the Constructivist Learning Environment Survey (CLES), Cornell Critical Thinking Test Level X, and demographic information on age and gender. Students perceived their learning environment to be moderately constructivist in nature. Both age and school banding differences were identified in that younger students and students in band 1 schools tended to perceive a higher degree of constructivist characteristics in their learning environment. Multiple regression analyses indicated that three of the five scales of CLES were predictors of critical thinking ability. Shared Control was the strongest predictor and negatively associated with critical thinking ability, while Personal Relevance and Critical Voice were positively related to critical thinking ability. Findings of the study are discussed with reference to developing students’ critical thinking ability in Liberal Studies classrooms.