Circadian rhythm effect on physical tennis performance in trained male players

To determine the effect of circadian rhythm on neuromuscular responses and kinematics related to physical tennis performance, after a standardised warm-up, 13 highly competitive male tennis players were tested twice for serve velocity/accuracy (SVA), countermovement vertical jump (CMJ), isometric handgrip strength (IS), agility T-test (AGIL) and a 10-m sprint (10-m RUN). In a randomised, counter-balance order, tennis players underwent the test battery twice, either in the morning (i.e., AM; 9:00 h) and in the afternoon (i.e., PM; 16:30 h). Paired t-tests were used to analyse differences due to time-of-day in performance variables. Comparison of morning versus afternoon testing revealed that SVA (168.5 ± 6.5 vs. 175.2 ± 6.1 km · h^?1; P = 0.003; effect size [ES] = 1.07), CMJ (32.2 ± 0.9 vs. 33.7 ± 1.1 cm; P = 0.018; ES = 1.46), AGIL (10.14 ± 0.1 vs. 9.91 ± 0.2 s; P = 0.007; ES = 1.23) and 10-m RUN time (1.74 ± 0.1 vs. 1.69 ± 0.1 s; P = 0.021; ES = 0.67) were significantly blunted during the morning testing. However, IS was not affected by time-of-day (P = 0.891). Thus, tennis performance may be reduced when competing in the morning in comparison to early evening. Therefore, coaches and tennis players should focus on schedule the SVA, power, speed and agility training sessions in the afternoon.     

Effect of Active Lessons on Physical Activity,Academic, and Health Outcomes: A Systematic Review

Purpose: The purpose of this study was to conduct a systematic review of classroom-based physical activity interventions that integrate academic content and assess the effectiveness of the interventions on physical activity, learning, facilitators of learning, and health outcomes. Method: Six electronic databases (ERIC, PubMed, Google Scholar, Science Direct, Cochrane Library, and EMBASE) and reference lists were searched for English-language articles, published January 1990 through March 2015, reporting classroom-based interventions that deliberately taught academic content using physically active teaching methods for at least 1 week duration, with physical activity, health, learning, or facilitators-of-learning outcomes. Two authors reviewed full-text articles. Data were extracted onto an Excel spreadsheet, and authors were contacted to confirm accuracy of the information presented. Results: Fifteen studies met the inclusion criteria. Six studies reporting on physical activity levels were found to have medium-to-large effect sizes. All 4 studies reporting learning outcomes showed positive effects of intervention lessons. Teachers and students were pleased with the programs, and enhanced on-task behavior was identified (n = 3). Positive effects were also reported on students’ body mass index levels (n = 3). Conclusions: Physically active academic lessons increase physical activity levels and may benefit learning and health outcomes. Both students and teachers positively received and enjoyed these teaching methods. These findings emphasize the need for such interventions to contribute toward public health policy.     

优秀沙排运动员薛晨肩关节脱臼的运动功能康复训练效果分析

摘要：目的：通过对我国优秀沙滩排球运动员薛晨肩关节脱臼术案例进行分析,探索优秀运动员备战奥运会期间从手术后到重返训练场间的身体运动功能康复训练安排。方法：借鉴重返赛场训练的方法手段,从康复医学、体能训练和运动表现等多学科角度设计有针对性的康复训练方法。通过对比训练前后关节活动度、肌肉力量、功能动作筛查结果以及下肢力量爆发力测试结果检验以优秀沙滩排球运动员肩关节脱臼为个案分析重返赛场的可行性训练策略。结果：通过10周身体运动功能训练,运动员下肢爆发力、损伤侧肩关节内外旋活动度、均有所增加。功能动作筛查分数降低。但损伤侧肩关节内旋肌力、腹侧核心耐力有所下降。结论：以优秀沙滩排球运动员肩关节脱臼重返赛场的训练策略为个案分析,探索从运动损伤术后至重返赛场训练过程的周期安排、训练方法的有效性;通过科学整合康复训练、体能训练和专项技术训练不同训练内容,循序渐进的帮助运动员恢复专项技术和运动能力。     

Political failure and the necessity for global democracy

Abstract

This paper aims to explore the changes in creative activities of young people – especially in the alternative media – in Indonesia before and after Reformasi. It begins with the story of the dynamics of a student press, from my personal experience – which I believe is a typical form of student/youth movement in Indonesia – and how the student’s life obviously depends on the political situation, the university policy, and the dynamics of the student’s life at that particular time. Reformasi caused political change and freedom but simultaneously, and ironically, placed the student press in a state of meaninglessness, such that it was painfully forced for search for new meanings to keep it contextually relevant in the new era. I end the paper describing the latest form of the alternative media scene of Indonesian youth, whose focus is dramatically shifting from ‘big’ political issues to issues of the celebration of communities and self‐existence.     

Modernising gender,civilising sex: perverse imaginary in the state feminist politics of Liu Yu‐hsiu

Abstract

The gender sexual politics of Liu Yu‐hsiu has been pivotal in the hegemonic ascendancy of Taiwan state feminism in recent years. Through an examination of Liu’s psychoanalytically mediated essays of cultural criticism, this article traces the contour of Liu’s sexual imaginary within the context of 1990s feminist and queer politics. Liu’s modernising project of gender equality, I argue, upholds heterosexual monogamy as a feminist ideal that seeks to purge all the masculine ills, including perversion and promiscuity. Meanwhile, queers and prostitutes come to be figured as the very negativity that must be repressed. Yet, like the Lacanian Real, they impinge on the symbolic order that Liu ordains as they thwart her desire to civilise sex.     

TGMD-3在中国3~12岁儿童基本运动技能测试中的信效度研究

目的: 验证TGMD-3在中国3~12岁儿童基本运动技能测试中的可靠性和有效性。方法: 选取上海、深圳、重庆、洛阳、长沙的512名3~12岁儿童为研究对象进行TGMD-3测试,对测试的难度、区分度、一致性信度、重测信度和评价者信度、结构效度进行统计检验。结果: TGMD-3的13个项目难度范围为0.27~0.78,区分度范围为0.38~0.49。每个年龄组儿童基本运动技能测试(TGMD-3)的内部一致性系数范围为0.808~0.902,其中男女生的内部一致性系数均为0.95;总体的基本运动技能评价者信度(肯德尔协同系数)w为0.944, 2值为28.331,达到显著性水平;重测检验中,移动式运动技能(组内相关系数)ICC为0.755、球类运动技能(组内相关系数)ICC为0.741、总的基本运动技能(组内相关系数)ICC为0.743,均达到了较高水平。通过探索性因子分析验证了TGMD-3的双因子结构,并通过验证性因子分析支持双因子模型(χ²(64)=103.28,p<0.001,CFI=0.960,TLI=0.952,RMSEA=0.049,SRMR=0.043)。结论: TGMD-3儿童基本运动技能测试具有良好的项目难度、区分度,以及可靠的内部一致性信度、重测信度和结构效度,对我国3~12岁儿童具有良好的适用性,可以作为我国儿童基本运动技能发展评价的有效工具。     

苍白球外侧部生理功能及其对运动调控作用研究进展

众多研究提示,基底神经节主要通过直接通路、间接通路和超直接通路进行运动调控,运动疲劳是由于基底神经节与皮层之间三条通路的失衡导致皮层不能发放有效的神经冲动引起的。苍白球外侧部在基底神经节的功能核团中居于中心地位,就国内外关于苍白球外侧部的生理功能及运动疲劳时苍白球外侧部在运动调控方面的研究现状予以梳理,旨在为相关研究提供参考。     

“闭眼投篮”练习方法教学效果探讨

人体的运动技能是在多种感受机能的参与下完成的,在视觉、听觉、位觉、触觉、本体感觉中,本体感觉是运动技术形成的基础。在我院篮球专项班学生在教学中增加“闭眼投篮”的练习,运用“闭眼投篮”练习与传统的投篮教学方法相结合进行教学,有助于迅速掌握投篮基本技术、技巧,建立正确的动力定型,而且能够改善学生的心理品质,克服心理障碍,有利于提高投篮的命中率,是提高篮球教学质量的有效手段。     

中国妇女解放运动与中国女子竞技体育的发展

中国女子竞技体育的发展与不同历史时期的妇女解放运动息息相关。在社会主义制度下, 女子在体育界享有与男子平等的权利。摒弃性别歧视, 实行两性合作, 是中国女子竞技体育起步晚、初期发展缓慢, 但后来迅速崛起的重要原因之一