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AbstractThe aim of this study was to determine the physical demands of women’s rugby union match play using time–motion analysis and heart rate (HR) response. Thirty-eight premier club level female rugby players, ages 18–34 years were videotaped and HRs monitored for a full match. Performances were coded into 12 different movement categories: 5 speeds of locomotion (standing, walking, jogging, striding, sprinting), 4 forms of intensive non-running exertion (ruck/maul/tackle, pack down, scrum, lift) and 3 discrete activities (kick, jump, open field tackle). The main results revealed that backs spend significantly more time sprinting and walking whereas forwards spend more time in intensive non-running exertion and jogging. Forwards also had a significantly higher total work frequency compared to the backs, but a higher total rest frequency compared to the backs. In terms of HR responses, forwards displayed higher mean HRs throughout the match and more time above 80% of their maximum HR than backs. In summary, women’s rugby union is characterised by intermittent bursts of high-intensity activity, where forwards and backs have similar anaerobic energy demands, but different specific match demands. 相似文献
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Some scholars and policymakers who are concerned about the inequitable distribution of quality teachers suggest offering financial incentives for working in hard-to-staff schools. Previous studies have estimated compensating differentials using hedonic modeling, an approach potentially undermined by district-wide salary schedules and the lack of labor market competitiveness. To address this problem, we build hedonic wage models for both public and private schools using data from the 1999–2000 Schools and Staffing Survey and the 2000 Census. Empirical estimates suggest that both public and private schools compensate teachers for some working conditions, but there also appear to be differences between public and private schools in the magnitude of the compensating differentials, particularly for teaching low-income students. 相似文献
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The article begins by examining the predominant image of young people today as alienated, apathetic, and uninvolved in their communities. It is argued that any debate about participation and politics should consider young people's involvement in voluntary and campaigning activities. Using data from a study of 1160 14-16 year-olds, it is shown that a considerable number of young people are involved in volunteering and campaigning, and also that these activities are influenced by gender, ethnicity, locality and the family. The article then explores the ways in which participation in volunteering and campaigning can promote the development of young people's political knowledge, awareness and understanding. It is demonstrated that involvement in these activities affects young people's political development in five ways, specifically in developing an understanding of the needs of different groups in society; a sense of influence over political and social events; a growing sense of party political differences and voting intent; reflection on social structures and processes; and acquiring skills useful in political campaigning. The policy implications of these findings are discussed. 相似文献
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A bstract . In this essay Andrew Metcalfe and Ann Game argue that although the term "dialogue" is commonly used in educational theory, its full significance is diluted if it is seen as a matter of exchange or negotiation of prior positions and identities. As a meeting point, they argue, dialogue suspends the senses of time, space, and ontology on which identities are based. It is therefore not simply metaphorical to say that dialogue changes lives and opens minds. Using empirical material from interviews with Australian students and teachers, Metcalfe and Game draw out the relational qualities of genuine dialogue and the significance they have for how we understand everyday classroom life. 相似文献
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The acute angiogenic signalling response to low-load resistance exercise with blood flow restriction
Richard A. Ferguson Julie E. A. Hunt Mark P. Lewis Neil R. W. Martin Darren J. Player Carolin Stangier 《European Journal of Sport Science》2018,18(3):397-406
This study investigated protein kinase activation and gene expression of angiogenic factors in response to low-load resistance exercise with or without blood flow restriction (BFR). In a repeated measures cross-over design, six males performed four sets of bilateral knee extension exercise at 20% 1RM (reps per set?=?30:15:15:continued to fatigue) with BFR (110?mmHg) and without (CON). Muscle biopsies were obtained from the vastus lateralis before, 2 and 4?h post-exercise. mRNA expression was determined using real-time RT–PCR. Protein phosphorylation/expression was determined using Western blot. p38MAPK phosphorylation was greater (p?=?0.05) at 2?h following BFR (1.3?±?0.8) compared to CON (0.4?±?0.3). AMPK phosphorylation remained unchanged. PGC-1α mRNA expression increased at 2?h (5.9?±?1.3 vs. 2.1?±?0.8; p?=?0.03) and 4?h (3.2?±?0.8 vs. 1.5?±?0.4; p?=?0.03) following BFR exercise with no change in CON. PGC-1α protein expression did not change following either exercise. BFR exercise enhanced mRNA expression of vascular endothelial growth factor (VEGF) at 2?h (5.2?±?2.8 vs 1.7?±?1.1; p?=?.02) and 4?h (6.8?±?4.9 vs. 2.5?±?2.7; p?=?.01) compared to CON. mRNA expression of VEGF-R2 and hypoxia-inducible factor 1α increased following BFR exercise but only eNOS were enhanced relative to CON. Matrix metalloproteinase-9 mRNA expression was not altered in response to either exercise. Acute low-load resistance exercise with BFR provides a targeted angiogenic response potentially mediated through enhanced ischaemic and shear stress stimuli. 相似文献
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Previous research has established the returns to academic ability in the general labor market, and this paper investigates such returns in the teacher labor market. Using a nationally representative sample of public school teachers, I find that teachers who graduate from the most selective undergraduate institutions have salaries that are between 7% and 14% higher than those who graduate from the least selective colleges. An empirical investigation of the source of these returns reveals that the majority of this difference is due to high-ability teachers sorting into higher paying districts, though a non-trivial amount arises from within-district deviations from the salary schedule. 相似文献
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Social relations are often seen as transactions between individuals. The dynamic teacher, accordingly, is one who gives energy and knowledge to students. Because this understanding fails to appreciate the relational forces at work in the lively classroom, it produces unhealthy attitudes toward education. Teachers who try to live up to it will not only burn out, they will distort their students’ educational development. The vitality of the classroom comes from an energy that is created between teachers and students; it is an energy in which both teachers and students share, but for which neither is individually responsible. The successful teacher must be able to receive if they are to be able to give. This argument is advanced using interviews with Australian teachers and students, all of whom were asked to describe the teachers who changed their lives. 相似文献
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Games Player 《少年电脑世界》2003,(12)
我在以前的《少电》上发表过一篇《文件隐身三步走》,但是最近又发现只要再经过几道简单的工序,就会更加完美。想学吗?Let’s go(已经说过N遍了)!我们先回顾一下那篇《文件隐身三步走》。那篇文章介绍的方法是利用眼睛的视线错觉隐藏文件夹,可谓开创了隐藏文件的先河(不是我自夸哦^o^)!可是,那个用做文件夹名的“`”还是可以被视力特别好的人看出来的(视力肯定是5.3),干脆用空格多好!恭喜你,得到的却是如图1和图2所示的结果。嘿嘿,空格当然不能做文件名,就像0不能做除数一样,是无意义的。难道就在这里被卡住了?当然不可以!让我们回到DOS时… 相似文献
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Although dialogue is a common word in educational theory, its full significance is diluted if it is seen as a matter of exchange or negotiation of prior intellectual positions. In fact, the dia‐ of dialogue indicates through: dialogue moves through participants and they through it. Dialogue allows participants to have thoughts they could not have had on their own, yet to recognise these thoughts as developments of their own thinking. On this understanding of dialogue, education is a transformative rather than simply accumulative process. Similarly, team teaching is often thought to involve no more than the summative logic of sharing loads and adding perspectives. In dialogic pedagogy, however, team teaching refers to the way that the supportive relationship between teachers opens opportunities for students to join the team as teachers. Although teachers and students have different responsibilities, all learn through a collective dialogue. The article draws on our practice of dialogic team teaching large first‐year classes. 相似文献
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