Positional group significantly influences the offensive and defensive skill involvements of junior representative rugby league players during match play

This study examined the skill involvements of three positional groups across a junior representative rugby league season. Data were collected from 45 rugby league players (mean ± SD; age = 16.5 ± 1.0 years) currently participating in the Harold Matthews and SG Ball Cup. Players were subdivided into hit-up forwards, adjustables and outside backs. The frequency (n · min^?1) of offensive, defensive and overall involvements was coded for each group using a notation system and a practical coach skill analysis tool. Multivariate analysis of variance (MANOVA) revealed a significant effect of playing position on skill involvements (F = 9.06; P < 0.001; ES = 0.41). Hit-up forwards performed a significantly greater frequency of offensive (0.31 ± 0.10), defensive (0.42 ± 0.15) and overall involvements (0.74 ± 0.19) when compared to adjustables (0.20 ± 0.08, 0.28 ± 0.08 and 0.52 ± 0.15, respectively) and outside backs (0.20 ± 0.12, 0.11 ± 0.07 and ± 0.31 ± 0.17, respectively). Further, adjustables performed a significantly greater number of defensive (0.28 ± 0.08) and overall involvements (0.52 ± 0.15) when compared to outside backs (0.11 ± 0.07 and 0.31 ± 0.17, respectively). The findings of this study suggest that it is important to consider a junior player’s positional group when analysing their skill involvements. Information gained from this study could assist in the design of specific training methodologies for junior rugby league players in high-level talent development programmes.     

Development of perceived competence,tactical skills,motivation, technical skills,and speed and agility in young soccer players

ABSTRACT

The objective of this 1-year, longitudinal study was to examine the development of perceived competence, tactical skills, motivation, technical skills, and speed and agility characteristics of young Finnish soccer players. We also examined associations between latent growth models of perceived competence and other recorded variables. Participants were 288 competitive male soccer players ranging from 12 to 14 years (12.7 ± 0.6) from 16 soccer clubs. Players completed the self-assessments of perceived competence, tactical skills, and motivation, and participated in technical, and speed and agility tests. Results of this study showed that players’ levels of perceived competence, tactical skills, motivation, technical skills, and speed and agility characteristics remained relatively high and stable across the period of 1 year. Positive relationships were found between these levels and changes in perceived competence and motivation, and levels of perceived competence and speed and agility characteristics. Together these results illustrate the multi-dimensional nature of talent development processes in soccer. Moreover, it seems crucial in coaching to support the development of perceived competence and motivation in young soccer players and that it might be even more important in later maturing players.     

ERP成本管理系统的应用研究

在现代制造环境下,作业成本法对传统成本法的成本管理改善已是不争的事实.文章从阐述作业成本法在ERP成本管理系统到底如何设计入手,探讨了在设计中应该注意什么问题等基本而现实的问题.     

无机物质数据库系统的研究与开发

无机物质数据库系统的开发过程.分为需求分析,流程分析,开发及运行环境选择,设计与实现四个步骤,该系统的运行情况证明使用该系统管理数据可显著提高生产率.     

GPS/GIS车辆监控管理系统中的关键技术

简要论述了车辆监控管理系统的工作原理及通信链路的选择策略，针对一套实用的GPS／GIS车辆监控系统设计方案，详细阐述了系统设计中的关键技术．     

工科《线性代数》总复习框架

将工科《线性代数》中所涉及到的知识点用一条脉络串起来,各个知识点之间的相互关系清晰明了,同时也将《线性代数》这门课程要求学生掌握的知识体系体现出来.     

试论高校扩招后教学质量保障体系的构建

教育教学质量是高校工作永恒的主题。当前,在高等教育规模超常扩张的条件下,应从以下四方面构建教育教学质量的保障体系,确保教育教学质量的稳步提高;树立正确的教育质量观,建立健全教学制度机制,建立教学质量评估体系,加大教学设施建设力度。     

关于复旦大学面试的一些思考

目前的人才选拔和培养体制过于片面和功利,不利于创新型人才的培养。复旦大学和上海交通大学的面试录取形式,是我国高考录取体制和方式的重大改革,如能坚持和不断改进,将具有里程碑意义。     

农民工工伤保险制度供给研究

通过分析农民工工伤保险制度供给的公共政策议程背景、经济失衡背景以及现实问题背景三大背景,从农民工、政府及企业三方契约参与者理性选择角度,展现农民工社会保险制度供给中应有的基本战略认识。     

科学探究能力在科学教学中的培养

科学探究的方法和过程。既可以使初中生亲身体验到探究的乐趣。经历科学探究活动的过程，又可以使学生逐步提高探究能力，文章从多方面阐述了如何在中学生日常科学教学中。培养学生的科学探究能力。