Increasing plantarflexion angle during landing reduces vertical ground reaction forces,loading rates and the hip’s contribution to support moment within participants

The ankle joint’s role in shock absorption during landing has been researched in many studies, which have found that landing with higher amounts of plantarflexion (PF) results in lower peak vertical ground reaction forces and loading rates. However, there has not yet been a study that compares drop landings within participants along a quantitative continuum of PF angles. Using a custom-written real-time feedback program, participants adjusted their ankles to an instructed PF angle and dropped onto two force platforms. For increasing PF, peak ground reaction force and peak loading rate during weight acceptance decreased significantly. The hip’s contribution to peak support moment decreased as PF at initial contact increased up to 30°. The ankle and knee contributions increased over this same continuum of PF angles. There appears to be no optimal PF angle based on peak ground reaction force and loading rate measurements, but there may be an optimum where joint contributions to peak support moment converge and the hip moment’s contribution is minimised.     

Influences of Teacher–Child Social Interactions on English Language Development in a Head Start Classroom

Increasing numbers of Spanish-speaking preschool children require attention to improve the likelihood of success in school. This study, part of a larger 2-year ethnographic study of a Head Start classroom, elaborates the role of teachers’ interactions with students who were learning English. Using an interactional ethnography approach, the authors focus on the social nature of these interactions. The study illuminates the kinds of teacher interactions with students that support and hinder the students’ language learning. It reinforces the importance of student engagement in social interactions with teachers and with English other than codes of obedience and authority. Finally, it recommends actions teachers can take to provide optimal circumstances for English learning interactions for students.

Reclaiming Teacher Agency in a Student-Centred Digital World

This article examines the current dilemma faced by many teachers: the drive for a modern day pedagogy advocating student-centred, technology-enabled learning is at odds with teacher comfort zones still nestled in a teacher-talk, print-based classroom. Put another way, the 'techno-reluctance' of many teachers represents a negative reaction to the perception that new technologies represent a threat to their traditional roles and general sense of practical agency in the learning process or classroom. The paper interprets some of the key factors impacting on techno-reluctance as a means of moving beyond such a simplistic view of the connection between digital technologies and changing teacher roles. On this basis, it goes on to discuss the concept of 'technoliteracy' as a means of reclaiming teacher agency in a studentcentred, computer-mediated environment and also reframing teacher attitudes to electronic texts and related literacy practices.