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I Stewart L McNaughton P Davies S Tristram 《Research quarterly for exercise and sport》1990,61(1):80-84
It is known that an increased level of red blood cell 2,3-diphosphoglycerate (DPG) shifts the oxyhemoglobin dissociation curve to the right, thus allowing a greater unloading of oxygen at the tissue level. It has been hypothesized that phosphate might help increase VO2max by increasing 2,3-DPG level. Eight trained cyclists underwent three cycle ergometer tests (control, placebo, and experimental) to determine whether phosphate ingestion had any positive effect on VO2max, time to exhaustion, serum 2,3-DPG, and serum phosphate levels. We found no change between the control, placebo, or experimental conditions in pretest serum phosphate levels, but we did find increases in 2,3-DPG levels in the phosphate condition (p less than .05), which suggests that even a small amount of phosphate could increase levels of 2,3-DPG. We also found significant differences in VO2max between the control (p less than .05) and placebo (p less than .02) conditions and also in time to exhaustion between the three conditions (p less than .05). We suggest that phosphate may have an ergogenic effect, but clearly more work needs to be undertaken to ascertain the amount of phosphate required and the magnitude of the effect. 相似文献
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This article explores the way in which government policy shapes the lives of young people who are not in education, employment or training (NEET). In particular it examines how the concept of NEETs is set within a specific infrastructure and discourse for managing and supporting young people. The article provides a brief history of the NEET concept and NEET initiatives, before moving on to scrutinise the policies of the Coalition Government. A key distinction is made between those policies and practices that seek to prevent young people becoming NEET from those that seek to re-engage those who are NEET. It is argued that the Coalition has drawn on a similar active labour market toolkit to the previous Labour administration, but that this has been implemented with fewer resources and less co-ordination. It concludes that there is little reason to believe that Coalition policy will be any more successful than that of the previous government, and some reason to be concerned that it will lead to young people becoming more entrenched within NEET. 相似文献
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Conceptualising teacher learning as being immersed in and arising from the totality of professional practice, this paper reports experiences and insights from practice-based teacher education. Initial data are drawn from two sites of seven involved in the federally funded School Centres for Teaching Excellence programme conducted in the state of Victoria, Australia. This programme is arranged as a partnership between the Department of Education and Early Childhood Development and various school clusters and universities. Each university is working with a cluster of primary and secondary schools and with large numbers (20–100) of pre-service teachers allocated to schools across each cluster. In general, PSTs in Victoria University’s two clusters are placed at each school for 2 days per week with some block time throughout the year. Some university units of study are taught on-site by visiting lecturers with a strong emphasis being placed on the mentoring of PSTs by classroom teachers. Interviews with mentors/mentees and teachers, PSTs and principals indicate a particular understanding or approach to an issue of learning or relationship that provides a frame/scaffold of practice. Further practice begins to detail the frame for continuing application. We are considering the notion of frame as a conceptual skeleton of understanding that arises from school and classroom practice and is formatted in practice. Cases of practice have been reported in the paper below that indicate preliminary understandings and engagement with this concept for the learning of teachers. 相似文献
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Neil Hooley 《The Australian Educational Researcher》2008,35(3):37-51
Being a proficient and professional teacher in Australia and similar countries is one of the most difficult and complex occupations imaginable. All teachers are confronted with carefully analysing the mix of socio-economic and cultural factors that present and design appropriate learning strategies that engage all students. Within this context, the following essay considers the purpose and structure of initial teacher preparation and possible changes to more traditional arrangements. It advocates a new type of school-university partnership where reflective cycles of practice-theory establish a close relationship with knowledge for all participants and where personal practice is the necessary condition of learning. Schools and classrooms are theorised as democratic public spheres where participants pursue understanding of serious issues for equity and the public good. Implications of partnership and public sphere for a new form of educational practice are discussed. 相似文献
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Communities and families that substantially exist outside of mainstream society because of a different world view must cope with a range of difficulties in accessing formal education for their children. In the stronger economies however it should be expected that inclusive public systems of education, health, transport and housing are made available for all citizens regardless of background. This paper indicates that for UK Roma Gypsies and Indigenous Australians this is often not the case. Socio-cultural and economic factors that distinguish various communities set up major contradictions with systems of schooling that frustrate and alienate children and which distract from learning. Drawing on national and international scholarship, a number of epistemological principles are discussed that may assist both groups to participate in schooling, recognising that adoption of such principles will require significant educational change. The concepts of ‘discursive learning’ and ‘bricolage’ are advanced as a philosophical framework for researching and guiding policy and practice as the basis of more equitable and democratic schooling for all children. 相似文献
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