Gold Medal Volleyball: The Training Program and Physiological Profile of the 1984 Olympic Champions

Abstract

This study focused on the differences between experienced and inexperienced physical education teachers' approaches to planning, low inference indicators of teaching behavior during instruction, and global variables from the Beginning Teacher Evaluation Study. It was found experienced teachers asked many more questions before they began planning than did inexperienced teachers. Experienced teachers' plans reflected a concern about contingencies that might arise during instruction, whereas inexperienced teachers' plans did not. Interaction analysis and codings of student engagement showed marked differences between experienced and inexperienced teachers. Judging the qualities of experienced and inexperienced teachers also showed important differences. These sources of data are interrelated and give a vivid picture of how experienced and inexperienced teachers differ in accomplishment of instruction. The findings are discussed in terms of what they may mean for teacher development programs.     

Morphology of the deltoid muscles in elite tennis players

Abstract

The aim of this study was to examine the deltoid muscle properties of the dominant and non-dominant arm of Greek professional male tennis players. Eight male tennis players (mean age 22.0 years, s = 3.2) were subjected to biopsy of the deltoid muscle of both arms. Adenosine triphosphate (ATPase) histochemistry and myosin heavy chain (MHC) composition were performed on the samples with homogenate electrophoresis. No significant differences were observed in the percentage of types I, IIa, IIab, and IIb muscle fibres between the deltoid muscles of the two arms. Types I, IIa, and IIx muscle fibres of the dominant and non-dominant deltoid muscles did not differ significantly for MHC isoform composition. Type IIab muscle fibres showed a similar cross-sectional area (CSA) percentage distribution between the two arms. The CSA percentage for types I, IIa, and IIb muscle fibers did not differ significantly between the dominant and the non-dominant arm. We conclude therefore that regular tennis training probably does not lead to any significant changes in the muscle fibre types of the dominant and non-dominant arms of elite tennis players.     

Determination of the swing technique characteristics and performance outcome relationship in golf driving for low handicap female golfers

Abstract

Previous studies on the kinematics of the golf swing have mainly focused on group analysis of male golfers of a wide ability range. In the present study, we investigated gross body kinematics using a novel method of analysis for golf research for a group of low handicap female golfers to provide an understanding of their swing mechanics in relation to performance. Data were collected for the drive swings of 16 golfers using a 12-camera three-dimensional motion capture system and a stereoscopic launch monitor. Analysis of covariance identified three covariates (increased pelvis–thorax differential at the top of the backswing, increased pelvis translation during the backswing, and a decrease in absolute backswing time) as determinants of the variance in clubhead speed (adjusted r ² = 0.965, P < 0.05). A significant correlation was found between left-hand grip strength and clubhead speed (r = 0.54, P < 0.05) and between handicap and clubhead speed (r = ?0.612, P < 0.05). Flexibility measures showed some correlation with clubhead speed; both sitting flexibility tests gave positive correlations (clockwise: r = 0.522, P < 0.05; counterclockwise: r = 0.711, P < 0.01). The results suggest that there is no common driver swing technique for optimal performance in low handicap female golfers, and therefore consideration should be given to individual swing characteristics in future studies.     

Digit ratio (2D:4D) and performance in elite rugby players

Abstract

The relative length of the second and fourth digits (2D:4D) is a putative marker for prenatal testosterone. Low 2D:4D has been reported to correlate with high performance in sport in general. Here, for the first time, we examine the relationship between 2D:4D and performance in elite rugby players. The 44 players (28 forwards, 16 backs) were drawn from the Ospreys Rugby Union Club and 44 age-matched controls. The measures of performance comprised age-adjusted number of international performances (caps) for Wales, a comparison of coaches' first-choice League team with others, and the number of tries scored by backs in club matches. Compared with controls, players were larger and had lower 2D:4D for the right and left hand. With regard to number of caps, players with low 2D:4D in their right hand and low right 2D:4D compared with their left (right ? left 2D:4D difference) had high numbers of caps. First-choice players did not differ significantly from second-choice players in their 2D:4D but they did have a lower right ? left 2D:4D difference than second-choice players. Low right 2D:4D and low right ? left 2D:4D difference were significantly linked with large numbers of tries. We conclude that low right 2D:4D and low right ? left 2D:4D difference are predictors of high rugby performance.     

高校排球课教学中引进竞争机制

在排球课中引进竞争机制,并将排球技能与竞争手段相连接,目的在于培养学生顽强、拼搏和积极进取的精神,活跃课堂气氛,提高教学质量。     

2002—2012年我国沙滩排球赛事运作现状研究

沙滩排球运动引进我国20多年来,先后举办国内外100多余站比赛。沙滩排球作为一项新型体育项目在赛事运作方面还不完善。文章运用文献资料法、专家访谈法、逻辑分析法等研究方法,对我国2002—2012年十年间的沙滩排球赛事运作模式进行了研究。以期为我国的沙滩排球赛事运作提供有益的帮助和借鉴、     

第十二届男排世界杯各队得分最多队员的主要技术特征分析

运用文献资料法、录像分析法、数理统计法等方法,对第十二届男排世界杯得分最多的球员在比赛中发球、接发球、拦网、扣球等方面的数据进行分析,得出如下结论:(1)本届男排世界杯得分最多队员的各种基本情况;(2)跳发大力球是得分最多队员的主要发球方式;(3)绝大部分接应二传放下接发球任务,且大部分是本队的得分最多队员。本文对各种数据的分析希望能为以后得分最多的男排队员的选材、发球,扣球及拦网技术的训练、比赛过程中各种技术数据的统计分析以及排球运动员的管理提供参考。     

浅析影响我国优秀篮球运动员运动寿命的因素

当今世界体坛竞争越来越激烈,优秀竞技运动员的培养一直被认为是各国发展竞技体育的重要任务之一,加之现代社会越来越追求经济效益的最大化,所以在竞技运动体育中如何延长优秀竞技运动员的运动寿命、追求最大训练效益,是当前我国体育主管部门亟待解决的问题.本文运用文献资料、数理统计等研究方法,通过对中外优秀篮球运动员的运动寿命以及参加第29界奥运会男篮前三名队伍和中国队队员的年龄情况比较分析得出结论,并指出影响我国优秀篮球运动员运动寿命的因素.     

旋转翼无人机自主避障路径规划

旋转翼无人机是利用机翼旋转产生飞行动力的,具有原地起飞以及空中悬停的能力。利用等高线地图数据,将闭合的等高线曲线看作障碍物,提取其控制点的高程数据,将实测高程以外的插入值去掉,得到一闭合多边形曲线。以旋转翼无人机飞行高度上的等高线曲线为感兴趣线,以此多边形为基础,一定长度为膨胀系数(比如等高距一半),建立起等高线等效障碍物模型,利用基于特征点的路径规划算法,以此等高线等效障碍物模型控制点坐标为特征点进行旋转关翼无人机的路径规划。     

高校排球教学中排球意识的培养

排球意识是影响运动员技战术水平的重要因素.本文运用文献资料、分析研究等方法,从排球意识的概念、内容、形成及影响因素等入手,提出了排球意识的培养方法,为高校排球教学提供理论依据.