Circadian rhythm effect on physical tennis performance in trained male players     

Álvaro López-Samanes  Diego Moreno-Pérez  José L. Maté-Muñoz  Raúl Domínguez  Jesús G. Pallarés  Ricardo Mora-Rodriguez 《Journal of sports sciences》2017,35(21):2121-2128

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.  相似文献   

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

Rosemarie Martin  Elaine M. Murtagh 《Research quarterly for exercise and sport》2017,88(2):149-168

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.  相似文献   

权利法哲学视野中的体育腐败及其治理原则     

兰薇  姜世波 《北京体育大学学报》2017,40(12):25-29

摘要：针对体育腐败现象,主要通过文献资料法,从权利法哲学视角对体育腐败的定义、本质及其治理原则进行法理解读,目的在于揭示体育领域腐败的深层机理并得出治理之策。体育腐败是发生在体育领域之内的腐败,是享有体育公共权力的主体滥用或怠于行使体育公共权力的行为。体育腐败可以分为两种情形,一种是利用体育职权为自己或他人谋取不正当利益;另一种情形是虽未获取不正当利益,但滥用或怠于行使体育职权致使他人利益或公共利益受损。体育腐败的本质源于在体育权利与体育权力的博弈过程中体育权利之抑制以及体育权力之嚣长,因此,体育腐败的基本治理应遵循以下两个原则：体育权利张扬原则以及体育权力制约原则。体育制度和体育道德是实现体育权利张扬和体育权力制约最有效之措施,应以体现权利张扬和权力制约的体育制度规范之“硬法”辅之以体育道德伦理的教化和治理之“软法”。  相似文献   

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     

罗晨  张梦雪  薛晨  林万珩 《北京体育大学学报》2017,40(6):60-65

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。  相似文献   

Swedish PE teachers’ understandings of legitimate movement in a criterion-referenced grading system     

Lena Svennberg 《Physical Education & Sport Pedagogy》2017,22(3):257-269

Background: Physical Education (PE) has been associated with a multi-activity model in which movement is related to sport discourses and sport techniques. However, as in many international contexts, the Swedish national PE syllabus calls for a wider and more inclusive concept of movement. Complex movement adapted to different settings is valued, and in the national grading criteria qualitative measures of movement are used. This research seeks to examine how the wider concept of movement is interpreted and graded. Drawing on Bernstein’s concept of the pedagogic device, the paper explores teachers’ roles as active mediators in the transformation of national grading criteria for movement and the kinds of movement that are valued in teachers’ grading practices. Purpose: The purpose of this study is to investigate what PE teachers consider legitimate movement in a criterion-referenced grading system and the factors that influence their grading practice. The Repertory Grid (RG) technique was employed in order to access their tacit knowledge. Methodology: Seven Swedish PE teachers were interviewed, all of whom teach and grade years seven to nine in different compulsory schools. Using the RG technique, the teachers were asked to reflect on the aspects they considered important for achieving a high grade. The national grading criteria for years seven to nine were then presented one at a time and the teachers were asked to describe how they assessed and graded each requirement. The teachers were also asked whether any specific factors had influenced their grading. In the content analysis, the second part of the interview was attended to first and the results were interpreted in light of Bernsteins’ concept of the pedagogic device. Findings: Sport techniques and competitive sports influenced the teachers’ interpretations of what constitutes complex movement. The aspect of fitness also appeared to be valued by the teachers in that it facilitates the valued movement. In some cases the difficulty of describing movement qualities in words could reduce the concept of movement to something measurable and quantifiable. The teachers’ concerns about students’ unequal opportunities to develop and demonstrate their skills also influenced the teachers’ interpretation of complex movement. Conclusions: In the transformation of national grading criteria to grading practice, the pedagogic actions taken inform and limit the way in which legitimate movement in PE is conceptualised. Adopting a concept of movement that is wider than competitive sports allows the structures of inequality to be addressed and enables the movements performed by students with other moving experiences than competitive sports to be valued. The tension between the demands of transparency in a high stakes grading system and the inability to articulate the quality of complex movements is problematic. There is a need to verbalise teachers’ conceptions about physical education knowledge to be able to discuss and develop the concept of movement. In this process, the RG technique is a potentially useful tool. Having the language to discuss movement qualities also enables us to strengthen the interrelation between curriculum, pedagogy and assessment.  相似文献   

Exergames ‘as a teacher’ of movement education: exploring knowing in moving when playing dance games in physical education     

Gunn Nyberg  Jane Meckbach 《Physical Education & Sport Pedagogy》2017,22(1):1-14

Background: A fundamental dimension of school physical education (PE) is arguably movement and movement activities. However, there is a lack of discussion in the context of PE regarding what can be called the capability to move in terms of coordinative abilities, body consciousness and educing bodily senses.

Purpose: This article explores and articulates what there is to know, from the mover's perspective, when knowing how to move in specific ways when playing exergames (dance games). Taking different ways of moving as expressing different ways of knowing as a point of departure, the following questions are the focus of this article: (i) How do students move when imitating movements in a dance game, and what different ways of knowing the movements can be described in the student group? (ii) What aspects of the movements are discerned simultaneously through the different ways of knowing the movements? (iii) What aspects seem critical for the students to discern and experience in order to know the movements in as complex a way as possible?

Design and analysis: The theoretical point of departure concerns an epistemological perspective on the capability to move as knowing how with no distinction between physical and mental skills, and also knowing as experiencing aspects of something to know. The data in this study comprise video recordings of students playing Nintendo Wii dance games in PE lessons in a compulsory school (for children aged between 7 and 16 years) in a small Swedish town. There were three PE lessons with four different stations, of which one was Nintendo Wii dance games (Just Dance 1 and 2). In total, the videoed material covers three 60-minute PE lessons, recorded during the autumn of 2012 and in which just over twenty students participated. In the study, we have used video observation as a data collection method. Jordan and Henderson maintain that video observation removes the gap between ‘what people say they do and what they, in fact, do’ (51). To conduct a systematic and thorough analysis of how the students experienced the avatar's movements, we looked for moments where all the students and the avatar could be simultaneously observed. Two video sequences were chosen, showing four students imitating two distinct and defined movements which constituted the basis for a phenomenographic analysis.

Conclusion: The result of the phenomenographic analysis shows different ways of knowing the movements as well as what aspects are discerned and experienced simultaneously by the students. In other words, these aspects also describe knowing in terms of discerning, discriminating and differentiating aspects of ways of moving. By examining a certain exergame's role ‘as a teacher,' we have emphasized the capability to move, from the mover's perspective, as an intrinsic educational goal of PE while highlighting the need for systematically planning movement education.  相似文献   

中介式调节作用在肥胖青少年锻炼经历与锻炼行为之间的关系研究     

古〓强  陈开梅  周大亮 《广州体育学院学报》2017,37(3):65-68

运用结构方程模型对均衡决策和自我效能在锻炼经历和锻炼行为中的作用进行分析,探讨肥胖青少年锻炼行为与锻炼经历、均衡决策、自我效能之间的关系.结果显示:均衡决策、自我效能在锻炼经历和锻炼行为的关系中起中介作用;自我效能对锻炼经历与均衡决策的关系,以及均衡决策与锻炼行为的关系起调节作用;均衡决策的中介效应受到自我效能的调节,并且均衡决策也是自我效能和锻炼行为关系的中介变量.自我效能对锻炼行为起间接中介作用,调节了锻炼经历与均衡决策、均衡决策与锻炼行为之间关系的作用轨迹和特征,促进了锻炼经历对锻炼行为的预测作用,影响了肥胖青少年的锻炼行为.  相似文献   

Political failure and the necessity for global democracy     

Wang Hui 《Inter-Asia Cultural Studies》2013,14(1):139-144

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.  相似文献   

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

Hans Tao‐Ming Huang 《Inter-Asia Cultural Studies》2013,14(4):540-558

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.  相似文献   

Theories and Evidence     

《Cultural and Social History》2013,10(2):219-226

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