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Nikos V. Margaritelis Anastasios A. Theodorou Antonios Kyparos Michalis G. Nikolaidis Vassilis Paschalis 《Journal of sports sciences》2019,37(14):1630-1637
Underfat individuals have been neglected as a malnourished population in terms of redox homeostasis. The aim of the present study was to evaluate the effect of body composition on redox homeostasis at rest and in response to exercise. Underfat, lean and overfat women, classified according to their BMI and body fat percentage, participated in the study and were subjected to an acute session of eccentric exercise. With regard to muscle function and damage, a significant group × time interaction was found for range of motion (P < .01), isometric peak torque at 90° (P < .01), delayed onset muscle soreness (P < .01) and creatine kinase (P < .05), with the lean group generally exhibiting faster recovery compared to the underfat and overfat groups. With regard to redox homeostasis, a significant group × time interaction was found for F2-isoprostanes, protein carbonyls and glutathione (P < .01 for all biomarkers), with the underfat and overfat groups exhibiting increased resting oxidative stress levels and lower exercise-induced reactive species production . In conclusively, our data underline the importance of normal body composition for redox homeostasis, since underfat and overfat women demonstrate a similar pattern of redox disturbances both at rest and in response to exercise. 相似文献
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The focus of this paper is on Sporting Schools, a $100 million policy initiative intended to increase children’s sport participation in Australia. Our account seeks to proffer a critical analysis of this federal policy, and the way it functions as part of the new heterarchical or networked form of sports governance in Australia. Using a network ethnography methodology, we analyse Sporting Schools from the perspective of National Sporting Organisations (NSOs), who have the key responsibility for enacting this policy. Using their perceptions, we reflect on their role as policy ‘boundary spanners’ and outline the complexities they face in creating ‘win-win’ scenarios so that schools, students, government and NSOs themselves all benefit from the Sporting Schools initiative. We argue that NSOs have to balance benefits and disbenefits and face tension between their desire for tight quality control of their school-based sports programmes and the need to have a cost-effective funding model for maximum exposure to schools and students. In conclusion, we reflect on the unintended consequences of enacting the policy in its current form, including issues of teaching and coaching expertise, the potential displacement of the educative value of PE in favour of school sport, and the opening of this public policy space to commercial providers on a for-profit basis. 相似文献
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Youth sport policies are increasingly driven by health concerns and social issues, and focus on broad participation outcomes. Given the significant financial investment in, and critique of, such policies internationally, this study aimed to examine the implementation of Sporting Schools (SS), a $100 million programme intended to increase children’s sport participation in Australia. In addressing the limited research in this area in the Australian context, we draw on the notion of policy as process [Penney & Evans, 2005 Policy, power and politics in physical education. In K. Green, & K. Hardman (Eds.), Physical education: Essential issues (pp. 21–38). London: SAGE] and Fullan's [Fullan (2015) The new meaning of educational change (5th ed.). New York, NY: Teachers College Press] work on educational change. This analysis employed a qualitative methodology. Data collection included interviews with 32 sporting organisation (SO) representatives, coaches, and teachers involved in the implementation of SS. Data were analysed using a combination of inductive and deductive approaches, and the trustworthiness of the findings was supported using several strategies. Findings indicated divergent understandings of the need for the SS programme by stakeholders, as well as a lack of clarity of the policy aims and the means for realising them. There was little indication that SOs, coaches and teachers were engaged in a meaningful, working relationship to accomplish the reform objectives of SS; however, each saw benefit in the programme. Youth sport policy implementation in schools is a complex process. The dynamic interplay among the various factors influencing such policies makes realising their stated intentions nigh on impossible. While working to enhance the enactment of SS as intended is important, we propose that youth sport policies written for enactment in schools need to be viewed as ‘soft policies’. The simplicity and limited accountability associated with ‘soft policies’ can be viewed as an opportunity to recognise the expertise of those who work, learn and move in schools, and trust them to use resources effectively and reconcile tensions based on their unique knowledge of their local school contexts. 相似文献
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Numerous academics have argued that if a field is to progress, attention needs to be paid to how future generations of researchers are being prepared. To date, data generated on research training in physical education and sport pedagogy (PESP) have primarily focused on students undertaking doctoral programmes with a formal coursework component, which is the model predominantly used in the USA. The traditional master-apprentice model is still, however, the dominant model in many countries, including Australia, and there is a dearth of research on this model of research preparation. Hence, this study was an effort to capture the perspectives and experiences of doctoral students (DSs) and early career researchers (ECRs) who are/were engaged in programmes employing the apprentice model of training. The question we sought to examine was ‘what do PESP doctoral students and early career researchers perceive as the facilitators and challenges associated with learning to be researchers?’. The participants in this study included eight DSs and seven ECRs who were based in Australian and New Zealand institutions. Data were generated through a questionnaire that sought to identify participants’ various research training experiences, a workshop that brought participants together to discuss their research training, and follow-up individual semi-structured interviews. While much of the data generated through this study related to the importance of developing such generic research skills as writing, grant writing and presenting at conferences, participants also discussed PESP-specific skills and dispositions, including particular orientations towards research impact, and the development of research culture. Findings are discussed in reference to the neoliberalisation of education and questions are raised about the forms of research training developing researchers in PESP might need if they are to thrive as researchers within and beyond the field. 相似文献
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Michalis P. Michaelides 《教育实用测度》2013,26(4):365-378
ABSTRACTThe Student Background survey administered along with achievement tests in studies of the International Association for the Evaluation of Educational Achievement includes scales of student motivation, competence, and attitudes toward mathematics and science. The scales consist of positively- and negatively keyed items. The current research examined the factorial structure of the 18-item motivational scales in fourth-grade mathematics in the 2011 Trends in International Mathematics and Science Study (TIMSS). Survey data from six European countries were analyzed. In comparisons of alternative models, the fit was adequate when three correlated factors were specified and negative keying was taken into account as a latent factor, or with correlated uniquenesses among negatively keyed items. Participants reading achievement scores correlated systematically to negative keying with coefficients ranging from .254 to .395 in the six samples. Unlike their higher-scoring peers, fourth-graders with lower reading achievement responded differentially to similar items depending on the direction of item keying, in such a way that their motivation scores were biased downward. Implications about the use of reverse keying in surveys for young students are discussed. 相似文献
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Michalis Kakos 《Ethnography and Education》2017,12(2):228-242
ABSTRACTThis paper reflects upon our experience gained from engagement in a meta-ethnography of two studies on interactions between teachers and students in schools situated in England and Germany. Starting with a short overview of Noblit and Hare’s (1988) conceptualisation of the method, the paper outlines the meta-ethnography we undertook especially focusing on the process of translation. We present the findings of our study which show teachers’ understanding of the pastoral aspect of their role as incompatible with demands related to their performance and to those associated with their institutional responsibilities. We show also how attempts to develop personalised interactions with students may reinforce students’ vulnerability. Our final discussion contributes our own deliberations about the potentials and challenges of the method, especially in relation to the role of the ethnographers and their relationship to the meta-ethnographic field. 相似文献