The effects of different doses of caffeine on endurance cycling time trial performance     

Desbrow B  Biddulph C  Devlin B  Grant GD  Anoopkumar-Dukie S  Leveritt MD 《Journal of sports sciences》2012,30(2):115-120

This study investigated the effects of two different doses of caffeine on endurance cycle time trial performance in male athletes. Using a randomised, placebo-controlled, double-blind crossover study design, sixteen well-trained and familiarised male cyclists (Mean ± s: Age = 32.6 ± 8.3 years; Body mass = 78.5 ± 6.0 kg; Height = 180.9 ± 5.5 cm VO2(peak) = 60.4 ± 4.1 ml x kg(-1) x min(-1)) completed three experimental trials, following training and dietary standardisation. Participants ingested either a placebo, or 3 or 6 mg x kg(-1) body mass of caffeine 90 min prior to completing a set amount of work equivalent to 75% of peak sustainable power output for 60 min. Exercise performance was significantly (P < 0.05) improved with both caffeine treatments as compared to placebo (4.2% with 3 mg x kg(-1) body mass and 2.9% with 6 mg x kg(-1) body mass). The difference between the two caffeine doses was not statistically significant (P = 0.24). Caffeine ingestion at either dose resulted in significantly higher heart rate values than the placebo conditions (P < 0.05), but no statistically significant treatment effects in ratings of perceived exertion (RPE) were observed (P = 0.39). A caffeine dose of 3 mg x kg(-1) body mass appears to improve cycling performance in well-trained and familiarised athletes. Doubling the dose to 6 mg x kg(-1) body mass does not confer any additional improvements in performance.  相似文献   

Teachers’ conceptions of teacher professionalism in England in 2003 and 2006     

Mandy Swann  Donald McIntyre  Tony Pell  Linda Hargreaves  Mark Cunningham 《British Educational Research Journal》2010,36(4):549-571

Theoretical and political perspectives on the nature of professionalism in teaching are abundant, but little is known about the views of teachers themselves. We asked primary and secondary school teachers in England what teacher professionalism means to them. We explored what teachers think about professionalism, on what dimensions their thinking varies, and how much it varies. We researched how successful the government had already been, and how successful it would be in the future, in changing teachers’ conceptions of professionalism. Two large‐scale national surveys were conducted, with a longitudinal element. We found that teachers’ thinking about their professionalism may be construed as consisting of an inner core of strong, shared beliefs and commitments; an intermediate set of coherent but contested components of professionalism; and an outer layer of disparate elements which are generally highly disputed and which remain unintegrated into broader ways of thinking.  相似文献   

Does skill specialisation influence individual differences in drag flicking speed and accuracy?     

Simon M. Rosalie  Andrew S. McIntyre  Stacey Stockman  Craig King  Cameron Watkins  Catherine Yvette Wild 《Journal of sports sciences》2017,35(6):602-609

Research has revealed that individual soccer goalkeepers respond differently to penalty shots, depending on their specific perceptual and motor capabilities. However, it remains unclear whether analogous differences exist between individual penalty takers, and if specialising in penalty taking affects the occurrence of differences between individuals. The present study examined individual differences in penalty shot speed and accuracy for specialists in penalty taking versus non-specialists. Expert specialist field hockey drag flickers and equivalently skilled non-specialists performed drag flicks towards predetermined targets placed in the face of a standard field hockey goal. Comparisons in shot speed and accuracy were made at a group level (specialists vs. non-specialists) as well as between individuals. Results revealed differences in both speed and accuracy between specialists, but only differences in speed between non-specialists. Specialists generated significantly greater shot speed than non-specialists (P < .001) and were more accurate to some, but not all, targets (top left, P < .006, bottom left P < .001). In addition, it was found that in specialists increasing practice correlated with decreasing accuracy. This may indicate that excessive practice could potentially reduce a specialist’s accuracy in shooting towards specific targets.  相似文献   

Working Knowledge: Australian Universities and "Real World" Education     

Colin Symes  David Boud  John McIntyre  Nicky Solomon  Mark Tennant 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2000,46(6):565-579

Universities are at a pivotal point in their history and are undergoing dramatic changes. One of the more significant of these changes is the move towards instrumental programmes of learning, as manifest for instance in workplace and work-based learning. This paper argues that this trend threatens the existence of the liberal university, where knowledge is pursued predominantly for its own sake. The paper identifies four dominant discourses in higher education and suggests that these discourses co-exist with one another, and are sometimes dominant, at other times recessive. It argues that the trend to a post-industrialised labour market has seen the emergence of a vocationalised discourse in higher education, which stresses the instrumental at the expense of the liberal.  相似文献   

Caffeine withdrawal and high-intensity endurance cycling performance     

Irwin C  Desbrow B  Ellis A  O'Keeffe B  Grant G  Leveritt M 《Journal of sports sciences》2011,29(5):509-515

In this study, we investigated the impact of a controlled 4-day caffeine withdrawal period on the effect of an acute caffeine dose on endurance exercise performance. Twelve well-trained and familiarized male cyclists, who were caffeine consumers (from coffee and a range of other sources), were recruited for the study. A double-blind placebo-controlled cross-over design was employed, involving four experimental trials. Participants abstained from dietary caffeine sources for 4 days before the trials and ingested capsules (one in the morning and one in the afternoon) containing either placebo or caffeine (1.5 mg · kg(-1) body weight · day(-1)). On day 5, capsules containing placebo or caffeine (3 mg · kg(-1) body weight) were ingested 90 min before completing a time trial, equivalent to one hour of cycling at 75% peak sustainable power output. Hence the study was designed to incorporate placebo-placebo, placebo-caffeine, caffeine-placebo, and caffeine-caffeine conditions. Performance time was significantly improved after acute caffeine ingestion by 1:49 ± 1:41 min (3.0%, P = 0.021) following a withdrawal period (placebo-placebo vs. placebo-caffeine), and by 2:07 ± 1:28 min (3.6%, P = 0.002) following the non-withdrawal period (caffeine-placebo vs. caffeine-caffeine). No significant difference was detected between the two acute caffeine trials (placebo-caffeine vs. caffeine-caffeine). Average heart rate throughout exercise was significantly higher following acute caffeine administration compared with placebo. No differences were observed in ratings of perceived exertion between trials. A 3 mg · kg(-1) dose of caffeine significantly improves exercise performance irrespective of whether a 4-day withdrawal period is imposed on habitual caffeine users.  相似文献   

Modernity at the Margins     

John Hedley Brooke 《Minerva》2006,44(4):463-467

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Winifred H. Lord     

Beryl Bailey  Elaine Brooke 《Health information and libraries journal》1990,7(3):183-183

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The analytical lens: developing undergraduate students’ critical dispositions in undergraduate EAP writing courses     

Mark Brooke  Laetitia Monbec  Namala Tilakaratna 《Teaching in Higher Education》2019,24(3):428-443

ABSTRACT

This paper comprises findings from three parallel case studies within the broad framework of English for Academic Purposes (EAP). These provide results from classroom-based action research conducted over two years working with Semantics, Specialisation and axiological cosmologies from Legitimation Code Theory (LCT). Each author shares how one or both of these LCT dimensions have guided their practice in the teaching of English for academic writing and specifically, the development of their students’ critical dispositions by teaching them how to apply lenses to analyse texts so that they may make informed judgements. Data from classroom interventions and student writing are provided. It is hoped that this paper elicits further discussion in the growing field of applying LCT and may draw attention to the role of the EAP teacher as expert in linguistics and the need to focus more on knowledge in EAP writing courses.  相似文献   

Multimodal Training Improves Spatial Reasoning Skills in Female College Students     

Applebee  Dennis  Bennett-Day  Brooke  Ferrari  James  Pritchard  Patrick  Boettger-Tong  Holly 《Journal of Science Education and Technology》2021,30(4):539-549

Journal of Science Education and Technology - Spatial reasoning is a valuable cognitive tool which enables navigation of the body in relation to other objects in space, permits deconstruction of...  相似文献   

‘We came together on the idea of being “foreign”’: Teacher narratives for the teaching of immigrant and refugee youth     

Brooke Harris Garad 《British Educational Research Journal》2021,47(4):942-958

In the midst of an international debate about immigration, this qualitative ethnographic study focuses on the stories and teaching practices of immigrant and refugee educators working with immigrant and refugee youth at a community-based after-school programme in the Midwestern region of the USA. Using existing literature to describe the educational experiences of immigrant and refugee youth and teacher narratives to explore the pedagogies of immigrant and refugee educators, the author addresses the following questions: How do political narratives impact the educational experiences of immigrant and refugee students in the USA? How can the narratives of immigrant and refugee teachers serve as both counternarratives and sources of promising pedagogical practices for immigrant and refugee youth? With a data corpus developed through participant observation, reflexive journaling, interviews and focus group discussions, the author uses narrative analysis with teacher vignettes and asserts that educational researchers and practitioners should look to immigrant and refugee educators to enrich the research about appropriate pedagogies for immigrant and refugee youth.  相似文献