The effect of beetroot juice supplementation on repeat-sprint performance in hypoxia     

Georgina L. Kent  Brian Dawson  Lars R. McNaughton  Gregory R. Cox  Louise M. Burke  Peter Peeling 《Journal of sports sciences》2019,37(3):339-346

This investigation assessed the effect of dietary nitrate (NO₃^?) supplementation, in the form of beetroot juice (BR), on repeat-sprint performance in normoxia and normobaric hypoxia. 12 male team-sport athletes (age 22.3 ± 2.6 y, VO_2peak 53.1 ± 8.7 mL.kg^?1.min^?1) completed three exercise trials involving a 10 min submaximal warm-up and 4 sets of cycling repeat-sprint efforts (RSE; 9 × 4 s) at sea level (CON), or at 3000 m simulated altitude following acute supplementation (140 mL) with BR (HYP_BR; 13 mmol NO₃^?) or NO₃^–depleted BR placebo (HYP_PLA). Peak (PPO) and mean (MPO) power output, plus work decrement were recorded during the RSE task, while oxygen consumption (VO₂) was measured during the warm-up. There were no significant differences observed between HYP_BR and HYP_PLA for PPO or MPO; however, work decrement was reduced in the first RSE set in HYP_BR compared with HYP_PLA. There was a moderate effect for VO₂ to be lower following BR at the end of the 10 min warm-up (ES = 0.50 ± 0.51). Dietary NO₃^? may not improve repeat-sprint performance in hypoxia but may reduce VO₂ during submaximal exercise. Therefore, BR supplementation may be more effective for performance improvement during predominantly aerobic exercise.  相似文献   

Families' digital media use: Intentions,rules and activities     

Lars Eichen  Sigrid Hackl-Wimmer  Marina Tanja Waltraud Eglmaier  Helmut Karl Lackner  Manuela Paechter  Karoline Rettenbacher  Christian Rominger  Catherine Walter-Laager 《British journal of educational technology : journal of the Council for Educational Technology》2021,52(6):2162-2177

  相似文献   

Effects of Mathematics Content Knowledge on Pre-school Teachers’ Performance: a Video-Based Assessment of Perception and Planning Abilities in Informal Learning Situations     

Simone Dunekacke  Lars Jenßen  Sigrid Blömeke 《International Journal of Science and Mathematics Education》2015,13(2):267-286

  相似文献   

Managing the teaching–research nexus: ideals and practice in research-oriented universities     

Lars Geschwind  Anders Broström 《高等教育研究与发展》2015,34(1):60-73

This paper demonstrates that while ideals of close linkages between research and teaching are widely embraced in research-oriented universities, a practice of division of labour between teaching-oriented and research-oriented staff persists. In an investigation of how the research–teaching nexus is managed at three Swedish universities, we identify a perceived misalignment between institutional incentives for individual academic staff and the needs of teaching. Under pressure from such tensions, managers are forced to deploy pragmatic strategies for the staffing of undergraduate education tasks. This includes allowing research needs and agendas to take priority over teaching needs. While managers seek to secure the participation of senior researchers in education, they often actively prefer to delegate the bulk of teaching activities to less research-active staff. Such strategies seem to reinforce existing patterns of division of labour among academic staff.  相似文献   

Reprint of: Social movements and free innovation     

Lars Bo Jeppesen 《Research Policy》2021,50(8):104288

In this article, I explore innovation and diffusion from social movements as part of the phenomenon of free innovation in households. The article contributes to the literature on household innovation by illustrating how social movement motivations may differ from motivations examined in prior studies focused on self-rewards, as well as examining the implications for free innovations and diffusion patterns in this setting. Social movement innovators are typically motivated by a common cause (such as a quest for a new life order and societal change) and create innovations that address a cause and “system change” rather than individual goals. I identify and define three types of social movement innovation: behavioral, product, and symbolic innovation. The common-cause motivation also creates a new form of diffusion problem that can only be solved through the spread and consumption of new products, behaviors, or techniques by a sufficiently large crowd. Common-cause motivations should thus encourage innovation diffusion, thereby reducing the risk of the diffusion-failure problem usually observed in household innovation research.  相似文献   

Students as Journeymen between Cultures of Higher Education and Work: A Comparative European Project on the Transition from Higher Education to Working Life1     

Lars Owe Dahlgren  Gunnar Handal  Tomasz Szkudlarek  Manfred Bayer 《Higher Education in Europe》2007,32(4):305-316

This paper addresses the feasibility of higher education in relation to the demands of work life. The research is a comparative study involving four European countries: Sweden, Norway, Poland, and Germany. The research focuses on the view of freshmen, senior students and later graduates in Psychology and Political Science. Data were obtained by semi‐structured interviews, which were subjected to qualitative analyses. The results indicate that higher education, with some exceptions, seems to produce a discipline‐based identity among the students. These findings may be indicative of the value for employability of classical academic generic skills.  相似文献   

Selection for special education services: the role of gender and socio-economic status     

Marianne Nilsen Kvande  Jay Belsky  Lars Wichstrøm 《欧洲特需教育杂志》2018,33(4):510-524

Children from some demographic groups disproportionately receive special education (SE) services. Due to methodological shortcoming in existing work, it remains unclear whether this is due to real differences in academic needs or cultural selection/bias. Hence, in a community sample of 1250 Norwegian children, we examined the role of third grade SE services, academic test scores, behavioural problems, and teacher’s level of helplessness in mediating the effect of family socio-economic status (SES) and students’ gender on fifth-grade SE services. Results revealed no direct effects of either gender or SES on fifth-grade SE, but four mediated pathways were identified: (1) Boys had a greater likelihood of receiving fifth-grade SE services when (a) they previously received SE and (b) they experienced more ADHD symptoms, both in third grade. (2) Students from low-SES families were more likely to receive SE services in fifth grade when (a) they performed poorly in math in third grade and (b) their teacher reported greater feelings of helplessness when teaching these students. The findings are discussed with respect to the differential-needs hypothesis, mechanisms of cultural selection and the possibility of gendered selection for SE at younger ages.  相似文献   

Learning for an unknown context: a comparative case study on some Swedish and Polish Political Science students' experiences of the transition from university to working life     

Kristina Johansson  Lucyna Kopciwicz  Lars Owe Dahlgren 《Compare》2008,38(2):219-231

This comparative small‐scale (Swedish and Polish sample) longitudinal qualitative study investigates political science students' conceptions of their studies, their future profession and their workplace learning. The students (10 in Sweden and 11 in Poland) were interviewed twice, first when they were at the end of their studies and a second time when they had worked for approximately one year. The questions asked were designed to try to understand the transition from higher education to work life. The results indicate that they bring with them a set of academic generic skills from their education when they enter working life. Furthermore, the students in the two countries have very different perceptions of the subject Political Science, and the expectations they have regarding their studies and future working life also differ considerably.  相似文献   

Standards as a tool for teaching and assessing cross-curricular writing     

Lars Sigfred Evensen  Kjell Lars Berge  Synnove Matre  Randi Solheim 《Curriculum Journal》2016,27(2):229-245

  相似文献   

Introducing teachers to new semiotic tools for writing instruction and writing assessment: consequences for students’ writing proficiency     

Kjell Lars Berge  Synnøve Matre  Randi Solheim  Lars S. Evensen  Hildegunn Otnes 《Assessment in Education: Principles, Policy & Practice》2019,26(1):6-25

This article reports consequences for student writing quality based on a long-term professional learning project. Project teachers, representing all school subjects in grades 3–7, were presented with a writing construct, ‘Wheel of Writing’, and norms of expectation for writing proficiency. Participating teachers used the writing construct and norms as a basis for writing instruction and writing assessment. The project was conducted in 24 schools across Norway. 3088 students from 20 project schools participated. Two hundred and thirty three students from 4 schools were used as a comparison group. The investigation showed that students in primary school improved their writing quality significantly. Students in lower secondary school did not. However, there was substantial variation in writing quality effects between schools, classes, and individual students. For instance at a number of schools, project students from lower secondary school improved their writing quality significantly. The article discusses potential explanations of the effects.  相似文献