Increasing hip and knee flexion during a drop-jump task reduces tibiofemoral shear and compressive forces: implications for ACL injury prevention training

Although most ACL injury prevention programmes encourage greater hip and knee flexion during landing, it remains unknown how this technique influences tibiofemoral joint forces. We examined whether a landing strategy utilising greater hip and knee flexion decreases tibiofemoral anterior shear and compression. Twelve healthy women (25.9 ± 3.5 years) performed a drop-jump task before and after a training session (10–15 min) that emphasised greater hip and knee flexion. Peak tibiofemoral anterior shear and compressive forces were calculated using an electromyography (EMG)-driven knee model that incorporated joint kinematics, EMG and participant-specific muscle volumes and patella tendon orientation measured using magnetic resonance imaging (MRI). Participants demonstrated a decrease in peak anterior tibial shear forces (11.1 ± 3.3 vs. 9.6 ± 2.7 N · kg^?1; P = 0.008) and peak tibiofemoral compressive forces (68.4 ± 7.6 vs. 62.0 ± 5.5 N · kg^?1; P = 0.015) post-training. The decreased peak anterior tibial shear was accompanied by a decrease in the quadriceps anterior shear force, while the decreased peak compressive force was accompanied by decreased ground reaction force and hamstring forces. Our data provide justification for injury prevention programmes that encourage greater hip and knee flexion during landing to reduce tibiofemoral joint loading.     

In search of a middle ground: the dangers and affordances of diagnosis in relation to Attention Deficit Hyperactivity Disorder and Developmental Language Disorder

ABSTRACT

In this paper, we draw on the ‘dilemma of difference’ to discuss the dangers and affordances of diagnosis within two of the most prevalent, yet under-supported, disabilities affecting school-age children: Attention Deficit Hyperactivity Disorder (ADHD) and Developmental Language Disorder (DLD). The dilemma that exists between denying and thereby ignoring difference on the one hand, versus recognising and potentially stigmatising difference on the other, will be explored and the consequences outlined. Our aim is to achieve a middle ground that conceives of diagnosis as a helpful starting point to enable educators to address barriers to access and participation through appropriate adjustments to curriculum, pedagogy and assessment.     

Subtypes, severity, and structural stability of peer victimization: what does latent class analysis say?

This study uses latent class analysis (LCA) to empirically identify victimization groups during middle school. Approximately 2,000 urban, public middle school students (mean age in sixth grade = 11.57) reported on their peer victimization during the Fall and Spring semesters of their sixth, seventh, and eighth grades. Independent LCA analyses at each semester yielded 3 victim classes based on victimization degree rather than type (e.g., physical vs. relational). The most victimized class always represented the smallest proportion of the sample, decreasing from 20% in sixth grade to 6% by the end of eighth grade. This victimized class also always reported feeling less safe at school concurrently and more depressed than others 1 semester later, illustrating the validity of the LCA approach.     

Writing Characteristics of Students with Attention Deficit Hyperactive Disorder: A Meta‐Analysis

Students with Attention Deficit Hyperactivity Disorders (ADHD) frequently experience significant difficulty mastering basic academic skills. This meta‐analysis focuses on one specific potential area of learning difficulties for these students: namely, writing. To identify the extent and depth of the potential writing challenges faced by students with ADHD, we conducted a meta‐analysis comparing the writing performance of grade 1 to 12 students with ADHD to their normally achieving peers. We located 44 papers, yielding 45 studies with 87 effect sizes. The average weighted effect sizes showed that students with ADHD obtained lower scores than their normally achieving peers for writing quality (–0.78), output (–0.64), number of genre elements (–0.69), vocabulary (–0.76), spelling (–0.80), and handwriting (–0.62). Contrary to expectations, moderator analyses found that neither study quality nor the source from which ADHD students were drawn (i.e., school/community vs. clinic/hospital) accounted for variability above sampling error alone.     

The role of law in protecting the child: A critique of the English system

We have undertaken a critical appraisal of the current English system of law regulating: (1) Provision of services designed to prevent children coming into care of local authorities, which are the authorised agencies for dealing with children who are abused or neglected. (2) Ways of receiving children into care and also ways of terminating care orders. We question whether, and under what circumstances, care orders are really necessary. (3) Periodic reviews of children in care. We are critical of the English system and look to models in the USA as guides towards the possible reform of English law. We take the same perspective when considering termination of parental rights. In our opinion good laws do not of themselves provide the care and love which a child requires, but they make the caring possible by loved and loving adults. We argue that the law must provide the best possible framework to allow adequate caring by members of the non-legal professions, such as social workers and foster parents. At the same time the law must ensure that the rights of parents and children are protected.     

Quantum pharmacology

Quantum chemistry is based on the solution of the Schrödinger equation for a molecule. From starting data on the positions and nature of constituent atoms information is provided about the energy of the molecule and its electronic properties. The former can indicate what shapes drugs can adopt in binding to pharmacological receptors whilst electronic details, when compared using computer graphics, may highlight the factors responsible for biological activity. These techniques are beginning to show real successes in the design of drug molecules.     

Common core writing and language standards and aligned state assessments: a national survey of teacher beliefs and attitudes

A random sample of 482 teachers in grades 3 through 8 from across the United States were surveyed about (a) their perceptions of the version of the Common Core writing and language standards adopted by their state and their state’s writing assessment, (b) their preparation to teach writing, and (c) their self-efficacy beliefs for teaching writing. Regardless of grade, a majority of teachers believed that the adopted standards are more rigorous than prior standards, provide clear expectations for students that can be straightforwardly translated into activities and lessons, and have pushed them to address writing more often. However, many surveyed felt the new writing and language standards are too numerous to cover, omit key aspects of writing development, and may be inappropriate for struggling writers. Moreover, most did not feel that professional development efforts have been sufficient to achieve successful implementation, and nearly one in five respondents was not familiar with the standards. The respondents were generally less sanguine regarding their state’s writing test, with elementary teachers even less positive than middle school teachers on some aspects, though nearly a third were unfamiliar with their state test. A majority believed state writing tests, though more rigorous than prior tests, fail to address important aspects of writing development, do not accommodate the needs of students with diverse abilities, and require more time than is available to prepare students. Additionally, many teachers believed professional development efforts have been insufficient to help them understand measurement properties of the assessments and how to use test data to identify students’ writing needs. Teachers who were better prepared to teach writing and who held more positive personal teaching efficacy beliefs for writing exhibited generally more positive perceptions of their state’s standards. In contrast, only teacher efficacy beliefs made a unique contribution to the survey respondents’ attitudes and beliefs about their state’s writing test.     

Student‐teachers' perspectives on positive and negative social processes in school

In recent years, the Standards for Qualified Teacher Status in England have placed new emphasis on student‐teachers' ability to become integrated into the ‘corporate life of the school’ and to work with other professionals. Little research, however, has been carried out into how student‐teachers perceive the social processes and interactions that are central to such integration during their initial teacher education school placements. This study aims to shed light on these perceptions. The data, gathered from 23 student‐teachers through interviews and reflective writing, illustrate the extent to which the participants perceived such social processes as supporting or obstructing their development as teachers. Signals of inclusion, the degree of match or mismatch in students' and school colleagues' role expectations, and the social awareness of both school and student‐teacher emerged as crucial factors in this respect. The student‐teachers' accounts show their social interactions with school staff to be meaningful in developing their ‘teacher self’ and to be profoundly emotionally charged. The implications for mentor and student‐teacher role preparation are discussed in this article.     

Teacher job satisfaction: lessons from the TSW Pathfinder Project

Government policy assumes that modernization and remodelling will be effective as external intervention mechanisms to improve job satisfaction. Based on data collected as part of the evaluation of the ‘Transforming the School Workforce Pathfinder Project’, an argument is presented here which suggests that internal management models may be more effective in improving teacher job satisfaction. By comparing the responses of teachers within primary and special schools with those from secondary schools, internal factors are identified which may be more relevant than externally imposed measures.