Bone dynamics: stress, strain and fracture

Bone is a dynamic tissue whose functional mass is controlled by the balance between the endocrine drive towards bone resorption and the mechanically-engendered drive towards bone formation. Strain is the key intermediate variable between loading forces and bone remodelling. Animal studies have shown that static loading of bone has no osteogenic effect; bone loss occurs as if there were no loading at all. However, dynamic loading, that is, cyclic change in internal strain, is strongly osteogenic, with relatively few cycles required for maximum effect. However, if a sufficient number of cycles is applied, repetitive loading can cause stress fractures. This number decreases as internal strains increase. Thus strain redistribution within bone, as caused by muscle fatigue or improper sports equipment, is a significant cause of fracture.     

The case for interprofessional education in teacher education and beyond

In many PreK-12 school environments, individuals with a variety of professional identities and roles provide services to students. Typically, these individuals are trained with minimal interaction with each other, yet they must work cooperatively with each other in the schools. Interprofessional education (IPE) provides a model whereby students in different disciplines learn to collaborate. This article describes the origins and current status of IPE in the health professions; suggests strategies for applying IPE to educator training; describes a promising example IPE project involving two distinct school-based professionals, pre-service special educators and school counsellors in training, including outcomes documented through student reflections; and offers implications for implementing and sustaining IPE in schools of education.     

Teacher Leaders Building Foundations for Data-Informed Teacher Learning in One Urban Elementary School

ABSTRACT

We examine how teacher leaders (TLs), working in a low-income urban elementary school, supported their colleagues to learn how to collect quality formative data and to discuss it in collaborative conversations in order to make their students’ learning visible. The TLs faced challenges reflecting consequences resulting from the district’s high stakes accountability policies restricting teachers’ agency with instructional decision-making and limiting their definitions of data as summative test scores. We document how the TLs worked to reframe teachers’ understanding of data to include evidence of student thinking and supported their colleagues to reclaim teaching as professional versus technical work.     

Conditioning-specific reflex modification of the rabbit (<Emphasis Type="Italic">Oryctolagus cuniculus</Emphasis>) nictitating membrane response: US intensity effects

Conditioning-specific reflex modification (CRM) of the rabbit’s nictitating membrane response (NMR) describes changes in responding to an unconditioned stimulus (US) when the rabbit is tested in the absence of the conditioned stimulus. Specifically, after at least 3 days of tone-electrical stimulation pairings, responses to the US increase in size, especially at intensities weaker than the training intensity. CRM is similar to classical conditioning in that it is a function of the strength of conditioning, it can be extinguished, and it can be generalized from one stimulus to another. To compare CRM and classical conditioning further, we conducted three experiments to examine the effects of US intensity (1.0, 2.0, and 4.0 mA) on CRM. CRM was weak following conditioning with 1.0 mA and extremely strong following conditioning with 2.0 mA and 4.0 mA. The data suggest that CRM is a function of US intensity and have implications for posttraumatic stress disorder, a disorder potentially modeled by CRM.     

Introduction: education,war and peace

Abstract

This editorial introduction to the special issue on education, war and peace proposes that the dynamics between education, war and peace have been insufficiently researched in the history of education but have become a focus of increasing attention. Education for war, education for peace, the impact of war on education, and representations of war and peace are particular aspects of this general theme that are developed in detail in the collection as a whole.     

So It “Became White Activists Fighting for Integration?” Community Organizations,Intersectional Identities,and Education Reform

Community-based organizations have long influenced education reforms, and urban areas are especially vulnerable to community work that transcends racial and economic boundaries. The purpose of this study is to explore how The League of Women Voters of Las Vegas Valley, a mostly White, middle-upper-class women’s organization, worked to pursue one of the most prominent urban education reforms in the last half century—school desegregation. Using interview and archival data, this historical case study is theoretically framed by various critical constructs to examine how the organization’s racial and economic privileges, and in some cases oppression, coupled with gendered systems of patriarchy and misogyny, influenced the process and outcomes of school desegregation reform in Las Vegas between 1966 and 1972. The organization’s intersectional identities afforded them unique opportunities and barriers. Nevertheless, they ultimately compromised on an inequitable policy that burdened Black children and their families for close to 20 years. These findings suggest that the intersectional identities of organizations can both empower and hinder community engagement in education reform. Because interests often diverge, organizations undertaking education reform should do the collective work necessary to address unintended policy consequences of education reform efforts.     

An Ecological Momentary Assessment of Burnout,Rejuvenation Strategies,Job Satisfaction,and Quitting Intentions in Childcare Teachers

Guided by affective events theory, the purpose of this study was to examine the temporal aspects of childcare teacher burnout, particularly as to how feelings of exhaustion throughout the day relate to perceptions of end-of-day job satisfaction and quitting intentions. A secondary purpose of the study was to explore the frequency and type of rejuvenation strategies childcare teachers use to relieve perceived stress throughout the day. Ecological momentary assessment procedures were employed for 1 week to assess exhaustion levels (3 times/day), frequencies and types of rejuvenation strategies (3 times/day), and end-of-day job satisfaction perceptions and quitting intentions (1 time/day) among 50 childcare teachers. Results indicated that childcare teachers’ quitting intentions were positively predicted by emotional exhaustion (β?=?0.52) and negatively predicted by overall job satisfaction (β?=??0.28). Short (≤15 min), infrequently used (one to two times/day) physical or cognitive health reprieve strategies were reported by 86?% of teachers as the most effective for reducing daily stress. Findings suggest that daily accounts of burnout and quitting intentions have both exhaustive and restorative properties.     

‘Whoops,I forgot David’: children's perceptions of the adults who work in their classrooms

This article reports on the findings of a small‐scale study into the perceptions of 78 primary school children regarding the adults in their classrooms. The data show that children easily differentiate between their own class teacher and other adults, but report a substantial overlap between the activities of teachers and teaching assistants. Some express the difference in terms of status rather than role. Accounts call into question the notion that teaching assistants ‘help’ rather than teach and that there is a clear division of labour between them and teachers. Teachers and assistants are seen as working in an interdependent way, with each making a significant contribution to children's learning. The difficulties of using children's language as evidence are considered and it is concluded that the notion of a ‘remodelled’ primary school workforce needs to take into account the ways in which teachers and assistants maintain fluid working relationships.     

Pedagogy in Counselor Education: 2011–2015 Update

This research update includes a quantitative content analysis of 133 peer‐reviewed articles regarding teaching and learning published in 21 journals of the American Counseling Association and its divisions between January 2011 and December 2015. The authors discuss the focus areas, pedagogical foundations, and methodologies of the articles in comparison with the findings of the original 2001–2010 study.