Phase analysis in maximal sprinting: an investigation of step-to-step technical changes between the initial acceleration,transition and maximal velocity phases     

Hans C. von Lieres und Wilkau  Gareth Irwin  Neil E. Bezodis  Scott Simpson  Ian N. Bezodis 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(2):141-156

Abstract

The aim of this study was to investigate spatiotemporal and kinematic changes between the initial acceleration, transition and maximum velocity phases of a sprint. Sagittal plane kinematics from five experienced sprinters performing 50-m maximal sprints were collected using six HD-video cameras. Following manual digitising, spatiotemporal and kinematic variables at touchdown and toe-off were calculated. The start and end of the transition phase were identified using the step-to-step changes in centre of mass height and segment angles. Mean step-to-step changes of spatiotemporal and kinematic variables during each phase were calculated. Firstly, the study showed that if sufficient trials are available, step-to-step changes in shank and trunk angles might provide an appropriate measure to detect sprint phases in applied settings. However, given that changes in centre of mass height represent a more holistic measure, this was used to sub-divide the sprints into separate phases. Secondly, during the initial acceleration phase large step-to-step changes in touchdown kinematics were observed compared to the transition phase. At toe-off, step-to-step kinematic changes were consistent across the initial acceleration and transition phases before plateauing during the maximal velocity phase. These results provide coaches and practitioners with valuable insights into key differences between phases in maximal sprinting.  相似文献   

Writing the radio war: Literature,radio and the BBC, 1939–1945     

Neil Verma 《Journal of Radio & Audio Media》2019,26(1):187-189

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The “Seductive outside” and the “Sacred precincts”: Boundaries and transgressions inThe Adventures of Tom Sawyer     

Neil Campbell 《Children‘s Literature in Education》1994,25(2):125-138

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The science and art of integrating ICT in Singapore schools – By Cher Ping Lim     

Neil Selwyn   《British journal of educational technology : journal of the Council for Educational Technology》2007,38(2):377-377

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Economic and social changes in the Pacific Rim: Implications for the counselling profession in Canada and Australia     

M. J. Westwood  Neil Quintrell 《International journal for the advancement of counseling》1994,17(3):205-212

Economic and social changes within the countries of the Pacific Rim are having a significant impact on Canada and Australia. This paper focuses upon what these changes mean for counsellors and counsellor education in these two countries. In addition, aspects of immigration and counsellor responsibility to newcomers is considered along with projected future scenarios related to counselling services.  相似文献   

The Generalized Mean     

Neil Sheldon 《Teaching Statistics》2004,26(1):24-25

This article defines the generalized mean and shows how it relates to such statistics as the arithmetic, geometric and harmonic means.  相似文献   

Using Cloud-Based Software to Build an Interlibrary Loan Survey Databank     

Neil Romanosky  Lloyd Chittenden  Kathryn Munson  Gretchen Smith 《Journal of Interlibrary Loan, Document Delivery & Electronic Reserve》2013,23(5):285-291

As an assignment for the Reference and User Services Association and as part of the American Library Association Emerging Leaders Program, the authors created a databank to house the results of a large-scale interlibrary loan staffing survey. After examining the pros and cons of several software solutions, the authors decided to use a Web-based database product, Dabble DB. The paper discusses the scope, outcomes, and value of the Reference and User Services Association interlibrary loan survey, the development of the authors’ project plan, and recommendations for the use of cloud-based database products in library operations.  相似文献   

Massive Open Online Change? Exploring the Discursive Construction of the ‘MOOC’ in Newspapers          下载免费PDF全文

Neil Selwyn  Scott Bulfin  Luci Pangrazio 《Higher Education Quarterly》2015,69(2):175-192

Massive Open Online Courses (MOOCs) have been a prominent topic of recent educational discussion and debate. MOOCs are, in essence, university‐affiliated courses offered to large groups of online learners for little or no cost and are seen by many as a bellwether for change and reform across higher education systems. This study uses content and discourse analysis methods to examine how understandings of MOOC‐related ‘change’ were presented in US, UK and Australian newspapers. Drawing on detailed analysis of 457 newspaper articles published between 2011 and 2013, the findings point to a predominant portrayal of MOOCs in relation to the massification, marketization and monetization of higher education, rather than engaging in debate of either ‘technological’ or ‘educational’ issues such as online learning and pedagogy, instructional design or student experience. The article then considers the reasons underpinning this restricted framing of what many commentators have touted as a radical educational form—not least the apparently close association between MOOCs and the economics of higher education.  相似文献   

Adopting a “satisficing” model for school performance in students' views of learning     

Neil Selwyn 《Educational Research and Evaluation》2013,19(3):193-212

In many countries it has been noticeable how students’ use of information technology (IT) in education is often sporadic and inconsistent; at odds with the esteemed status that IT is afforded in educational rhetoric and policy. The traditional approach to the uneven take-up of IT in education has been to concentrate on the deficiency of the student in not using computers. In this way students’ avoidance of IT use is often framed in terms of a psychological inability or deficiency to react with computers. However, this article attempts to look beyond this traditional ‘discourse of deficiency’ and explore the myriad factors influencing students’ decisions not to use computers during their education. On the basis of data gathered from focus group interviews with 96 UK students, three main constructs underlying students’ rejection of educational computing are identified. The article discusses how educational computing can be ‘re-constructed’ in the light of these factors. Résumé Dans de nombreux pays, on a remarqué combien l’usage que font les étudiants des technologies de l’information (IT) en éducation est souvent sporadique et inconsistant, très loin du statut des IT généralement attribu? dans le discours rhétorique et politique sur l’éducation. L’approche traditionnelle de la difficulté a été? focalisée sur les déficiences de l’étudiant qui n’utilise pas l’ordinateur. Dans ce sens, le fait que l’étudiant cherche à éviter l’usage des IT est souvent formul? en termes d’inaptitude psychologique ou de déficience dans les réactions face à l’ordinateur. Cette étude cherche à voir plus loin que ce discours traditionnel de déficience de l’étudiant et explore la myriade de facteurs qui influencent les décisions de l’étudiant de ne pas utiliser l’ordinateur pour étudier. Sur la base de données recueillies lors d’interviews touchant 96 étudiants de Grande-Bretagne, trois types de rejets sous-jacents de l’informatique éducationnelle ont été identifiés. Le document discute la manière dont celle-ci peut être ‘re-construite’ à la lumière de ces facteurs.  相似文献   

Modeling locations with social media     

Neil O’Hare  Vanessa Murdock 《Information Retrieval》2013,16(1):30-62

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