A new footwear technology to promote non-heelstrike landing and enhance running performance: Fact or fad?     

Janet H. Zhang  Aislinn J. C. McPhail  Winko W. An  Waqar M. Naqvi  Daniel L. H. Chan  Ivan P. H. Au 《Journal of sports sciences》2017,35(15):1533-1537

This study sought to compare the kinetics and kinematics data in a group of habitual shod runners when running in traditional running shoes and newly designed minimalist shoes with lug platform. This novel footwear design claims to simulate barefoot running and reduce energy loss during impact. We compared footstrike angle (FSA), vertical average (VALR) and instantaneous (VILR) loading rates, energy loss and initial vertical stiffness between two shoe conditions. Runners demonstrated a decreased FSA while running in minimalist shoes with lug platform than traditional shoes (P = 0.003; Cohen’s d = 0.918). However, we did not observe a landing pattern transition. VALR and VILR between two footwear conditions showed no significant difference (P = 0.191–0.258; Cohen’s d = 0.304–0.460). Initial vertical stiffness (P = 0.032; Cohen’s d = 0.671) and energy loss (P = 0.044; Cohen’s d = 0.578) were greater when running in minimalist shoes with lug platform. The results show that minimalist shoes with lug platform reduce the FSA but may not lead to a landing pattern switch or lower vertical loading rates. Interestingly, the new shoe design leads to a greater energy loss than traditional running shoes, which could be explained by a higher initial vertical stiffness.  相似文献   

The Freedom to Teach     

Ivan J. K. Dahl 《The Teacher Educator》2013,48(2):23-26

Maintaining that academic freedom is necessary if schools are to function effectively, Dr. Dahl presents lucid arguments to support his position.  相似文献   

Force–velocity property of leg muscles in individuals of different level of physical fitness     

Ivan Cuk  Dragan Mirkov  Aleksandar Nedeljkovic  Milos Kukolj  Dusan Ugarkovic 《Sports biomechanics / International Society of Biomechanics in Sports》2016,15(2):207-219

The present study explored the method of testing muscle mechanical properties through the linear force–velocity (F–V) relationships obtained from loaded vertical jumps. Specifically, we hypothesised that the F–V relationship parameters depicting the force, power, and velocity of the tested muscles will differ among individuals of different physical fitness. Strength trained, physically active, and sedentary male participants (N = 10 + 10 + 10; age 20–29 years) were tested on maximum countermovement and squat jumps where manipulation of external loads provided a range of F and V data. The observed F–V relationships of the tested leg muscles were approximately linear and mainly strong (median correlation coefficients ranged from 0.77 to 0.92; all p < 0.05), independently of either the tested group or the jump type. The maximum power revealed higher values in the strength trained than in the physically active and sedentary participants. This difference originated from the differences in F-intercepts, rather than from the V-intercepts. We conclude that the observed parameters could be sensitive enough to detect the differences among both the individuals of different physical fitness and various jump types. The present findings support using loaded vertical jumps and, possibly, other maximum performance multi-joint movements for the assessment of mechanical properties of active muscles.  相似文献   

History Run Wild: The Alternate World of Joan Aiken’s <Emphasis Type="Italic">The Wolves of Willoughby Chase</Emphasis> Series     

Isobel?DamsEmail author 《Children‘s Literature in Education》2005,36(2):99-109

This article examines the historical fantasy world created by Joan Aiken in the eleven volumes of her Wolves of Willoughby Chase series. In particular it looks at her subversion of historical reality by the creation of an alternative yet recognisable representation of our own world, using a wide range of events, and the remoulding of aspects of language and geography. It also discusses her reasons for writing in this form and explores the character of Dido Twite as heroine and major raison dtre of the series.This revised version was published online in May 2005 with corrections to the article title.  相似文献   

How young people respond to learning spaces outside school: A sociocultural perspective     

Alan?PeacockEmail author  Nick?Pratt 《Learning Environments Research》2011,14(1):11-24

This article focuses on educational enterprises outside the formal sector, such as museums, botanical gardens and interactive science centres. International research is drawn on to illuminate how design, culture, educational strategies and settings combine to affect the way in which young people respond to experiences on offer, leading to analysis of the impact of such settings in promoting learning, and the likely implications for those who staff such venues. Aikenhead’s concept of the educator as ‘culture broker’ is developed to suggest ways in which learning might be best supported. It envisages a shift from ‘delivery’ strategies targeted at large groups towards approaches which focus on what learners choose to know about using dialogue between children and ‘known and trusted people’. Analysis of observed responses in various settings is undertaken from a sociocultural perspective using the notion of communities of practice. Implications for the roles of education managers and their staff in further research are developed.  相似文献   

Grant‐maintained Heads’ Reflections on Opting Out     

Jonathan Cauldwell  Ivan Reid 《Educational studies》1996,22(2):245-260

This article summarises the views of 222 grant‐maintained (GM) school's head teachers’ experience of, and reasons for, their schools opting out of local authority control. The survey was conducted on the first 499 secondary schools to go GM. The article investigates issues such as admissions, finances and also the effects of GM status (GMS) on the relationships with, and roles of, local education authorities, the Department for Education, parents and governors. The article provides an overview of moves to GMS and highlights prior aims and reflections.  相似文献   

The effect of network size on intra-network knowledge processes     

Donald?HislopEmail author 《知识管理研究与实践》2005,3(4):244-252

This paper addresses a neglected topic in the knowledge management literature: how the size of a network of actors affects the nature of intra-network social relations and knowledge processes. It makes a theoretical contribution to developing understanding in this area drawing on a range of literatures including practice-based perspectives on knowledge, the literature on the embeddedness of social relations, and relevant knowledge management literature. The central focus of this paper is on the relationship between network size, network density, and how these variables affect intra-network knowledge processes. It suggests that as network size increases network density is likely to decrease (as it becomes problematic for the actors in such networks to retain strong ties with a significant proportion of the network's members), which it will be suggested has significant ramifications for intra-network knowledge processes. This paper concludes by reflecting on the implications of the ideas developed for network-based forms of organizing, and innovation processes.  相似文献   

THE FORGOTTEN MINORITY     

Ivan Z. Holowinsky 《Review of Education, Pedagogy & Cultural Studies》2013,35(1):69-73

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Knowledge of the natural and the social: how are they different and what do they have in common?     

Zhichang?ZhuEmail author 《知识管理研究与实践》2010,8(2):173-188

Knowledge of the natural and the social are irreducibly different yet have much in common. The differences lie at the levels of complexity they engage, modes of explanation they adopt, investigation aims they allow and whether they assert a ‘double hermeneutic’ effect to the behaviour of the studied objects. Knowledge are in common in that they are all construed out of available resources, justified based on the consequences of acting upon them, settled until better alternatives emerge, and serving as walking sticks for beating unknown paths in human life. Because of this, there can be no hierarchy of knowledge or unity of methodology, and dialogical encounters guided by situational ethics, not professional deafness driven by ontological/instrumental fallacies, are a viable strategy for morally and practically wise actions, including knowledge management projects.  相似文献   

Development,direction, and damage limitation: Social learning in domestic fowl     

Nicol CJ 《Learning & behavior》2004,32(1):72-81

This review highlights two areas of particular interest in the study of social learning in fowl. First, the role of social learning in the development of feeding and foraging behavior in young chicks and older birds is described. The role of the hen as a demonstrator and possible teacher is considered, and the subsequent social influence of brood mates and other companions on food avoidance and food preference learning is discussed. Second, the way in which work on domestic fowl has contributed to an understanding of the importance of directed social learning is examined. The well-characterized hierarchical social organization of small chicken flocks has been used to design studies which demonstrate that the probability of social transmission is strongly influenced by social relationships between birds. The practical implications of understanding the role of social learning in the spread of injurious behaviors in this economically important species are briefly considered.  相似文献