Acute effects of static stretching on characteristics of the isokinetic angle – torque relationship,surface electromyography,and mechanomyography

Abstract

The aims of this study were to examine the acute effects of static stretching on peak torque, work, the joint angle at peak torque, acceleration time, isokinetic range of motion, mechanomyographic amplitude, and electromyographic amplitude of the rectus femoris during maximal concentric isokinetic leg extensions at 1.04 and 5.23 rad · s^?1 in men and women. Ten women (mean ± s: age 23.0 ± 2.9 years, stature 1.61 ± 0.12 m, mass 63.3 ± 9.9 kg) and eight men (age 21.4 ± 3.0 years, stature 1.83 ± 0.11 m, mass 83.1 ± 15.2 kg) performed maximal voluntary concentric isokinetic leg extensions at 1.04 and 5.23 rad · s^?1. Following the initial isokinetic tests, the dominant leg extensors were stretched using four static stretching exercises. After the stretching, the isokinetic tests were repeated. Peak torque, acceleration time, and electromyographic amplitude decreased (P≤ 0.05) from pre- to post-stretching at 1.04 and 5.23 rad · s^?1; there were no changes (P > 0.05) in work, joint angle at peak torque, isokinetic range of motion, or mechanomyographic amplitude. These findings indicate no stretching-related changes in the area under the angle – torque curve (work), but a significant decrease in peak torque, which suggests that static stretching may cause a “flattening” of the angle – torque curve that reduces peak strength but allows for greater force production at other joint angles. These findings, in conjunction with the increased limb acceleration rates (decreased acceleration time) observed in the present study, provide tentative support for the hypothesis that static stretching alters the angle – torque relationship and/or sarcomere shortening velocity.     

Determining the minimum number of passive stretches necessary to alter musculotendinous stiffness

Abstract

In this study, we examined the minimum number of constant-torque passive stretches necessary to reduce musculotendinous stiffness. Thirteen healthy individuals (mean age 22 years, s = 3; stature 1.67 m, s = 0.1; mass 66 kg, s = 13 kg) volunteered to participate in the investigation and underwent four 30-s constant-torque passive stretches of the plantar flexor muscles. Musculotendinous stiffness was examined from the angle–torque curves generated prior to the passive stretches, at the beginning of each 30-s stretch, and immediately following the four 30-s passive stretches. The results indicated that musculotendinous stiffness of the plantar flexors was reduced following two 30-s constant-torque passive stretches (P < 0.05) compared with the pre- musculotendinous stiffness assessment. Musculotendinous stiffness remained depressed following the third and fourth stretches, but did not decrease further. These findings suggest that two 30-s bouts of constant-torque passive stretching may be necessary to cause a significant decrease in musculotendinous stiffness of the plantar flexor muscles.     

Teachers and students with severe learning difficulties working together to co‐construct personal narratives using Storysharing®: the teacher perspective

The telling of personal stories is a feature of everyday life. Young people with learning difficulties may find it difficult to report what has happened to them. A project was set up to investigate the impact of Storysharing® on the co‐construction of personal narratives by staff and students in a special school. The current study investigated the teacher's perspective. The sample was comprised of four special education teachers who had been involved in the implementation of Storysharing®. Semi‐structured interviews were carried out at the end of the intervention period. The data were analysed using thematic analysis. Three organising themes emerged from the data: ‘Enactment Process’; ‘Benefits to Child’; and ‘Curriculum.’ The Storysharing® intervention appeared to be positively associated with perceived changes to the educational practice of the teachers, revealing its potential for developing narrative in the classroom.     

A Comparison of the Degree of Student Satisfaction using a Simulation or a Traditional Wet Lab to Teach Physical Properties of Ice

It is often difficult to offer food chemistry students traditional, hands‐on laboratory experiences due to lack of funds for equipment, insufficient laboratory space, or the nature of distance education. A traditional wet laboratory exercise was developed to demonstrate the effects of the physical properties of ice formation when making high‐quality sorbets, varying the amounts of sugar, water, and stabilizer. This wet lab was compared to a simulated, detective‐based crime scene investigation (CSI) of why a famous food scientist's sorbet had become a “stiff.” Forty‐six food chemistry students were randomly assigned to groups, completing either the traditional wet lab or the simulated lab 1st before completing the 2nd type of laboratory. While there were preferences for one lab over another, there were no differences in the learning outcomes between the 2 laboratory formats. Students who preferred the simulated lab felt they could move at their own pace and were able to stop and review the simulation to understand the concepts more clearly. Traditional wet lab proponents liked working in groups and having immediate access to instructors. From the initial evaluation it appears that simulations could be used as replacements for hands‐on laboratory experiences or could serve as effective introductions to laboratory principles and concepts, resulting in increased student learning.     

Practitioners' perspectives and experiences of supporting bilingual pupils on the autism spectrum in two linguistically different educational settings

With greater linguistic diversity in educational settings around the world as a result of international migration, and a rise in autism diagnoses, educators are more frequently teaching children who are both neurodiverse and linguistically different to their peers. The aim of the present study was to uncover the perspectives and experiences of educational practitioners who provide support for bilingual learners on the autism spectrum in two linguistically different educational settings: England and Wales. Semi-structured interviews were conducted with 13 practitioners (5 teachers, 4 teaching assistants, 3 special educational needs coordinators and 1 speech and language therapist) working in mainstream schools. Data were analysed using interpretative phenomenological analysis (IPA), which seeks to illuminate participants' lived experience. Three superordinate themes were extracted from the data: (1) perspectives on bilingualism in autism; (2) comparisons across two linguistically different settings; (3) creating inclusive learning environments. The results demonstrate that practitioners had concerns about the feasibility of bilingualism for some autistic pupils, and argued that exposure to two languages may have a negative impact on their development. Future research should focus on finding effective ways to identify and support learning needs among bilingual pupils to ensure that children who are ‘doubly different’ from their peers not only have access to educational provision, but also have opportunities to harness and celebrate their differences.     

The Sacred and the Profane in Recent Struggles to Promote Official Pedagogic Identities

This paper begins by highlighting the concerns of a number of commentators about what they perceived as an unprecedented incursion of market-oriented instrumental values in higher education in the last quarter of the twentieth century. Bernstein's analysis of these issues is shown to draw upon Durkheimian concepts of the sacred and the profane. Similarities and differences between Durkheim's and Bernstein's definitions of these concepts are examined, and Bernstein's use of them in relation to the formation of pedagogic identities is a major focus of the paper. The second part of the paper examines two particular aspects of Bernstein's exploration of the consequences of growing marketization and managerialization for identity change in education: the displacement of 'singulars' by 'regions', and the introduction of 'generic' pedagogic modes. In both cases, although perhaps to differing degrees, the sacred is displaced and, under certain conditions, the profane 'outer' is in danger of becoming the subjective 'inner'. Bernstein's discussion of generic modes is illustrated by reference to recent changes in teacher training in England and Wales.