Predicting vertical ground reaction force during running using novel piezoresponsive sensors and accelerometry

ABSTRACT

Running is a common exercise with numerous health benefits. Vertical ground reaction force (vGRF) influences running injury risk and running performance. Measurement of vGRF during running is now primarily constrained to a laboratory setting. The purpose of this study was to evaluate a new approach to measuring vGRF during running. This approach can be used outside of the laboratory and involves running shoes instrumented with novel piezoresponsive sensors and a standard accelerometer. Thirty-one individuals ran at three different speeds on a force-instrumented treadmill while wearing the instrumented running shoes. vGRF was predicted using data collected from the instrumented shoes, and predicted vGRF were compared to vGRF measured via the treadmill. Per cent error of the resulting predictions varied depending upon the predicted vGRF characteristic. Per cent error was relatively low for predicted vGRF impulse (2–7%), active peak vGRF (3–7%), and ground contact time (3–6%), but relatively high for predicted vGRF load rates (22–29%). These errors should decrease with future iterations of the instrumented shoes and collection of additional data from a more diverse sample. The novel technology described herein might become a feasible way to collect large amounts of vGRF data outside of the traditional biomechanics laboratory.     

Curriculum reform and choice of science: Consequences for balanced and equitable participation and achievement

In 1988, most schools in Western Australia adopted a Unit Curriculum structure in the first three years of high school, following piloting of the scheme in seven schools in 1987. The goais of the Unit Curriculum are stated to be excellence, equity, and relevance, and one of its key features is the increased flexibility students have in making their subject selection. This article reviews the science enrollment and achievement patterns of males and females studying in the pilot schools in 1987, and for the first three years of the operation of the Unit Curriculum in 1988, 1989, and 1990. The data indicate that lowering the age for subject choice is associated with a reduction in the amount of science studies, especially by females, and with the early manifestation of sex-stereotyped subject selection. It appears that if early sex stereotyping is to be avoided, then students need to be provided with more structure in their selection of units. This article emphasizes the need for all involved in system-wide curriculum change to be fully informed of the potential benefits and dangers of curriculum models which allow wide flexibility, especially where curriculum change affects students' “choice point”.     

Learning to Lead: Challenges and Resources for The New Public Library Director

Library directors are part of the infrastructure of information management, but how well do they manage their institutional knowledge for succession planning? Our study looked at strategies to ease managerial transitions between libraries, focusing on knowledge management, communities of practice, and mentorship. Our survey found that succession planning was dictated by local practice and size of library. The results of this paper inform knowledge of succession planning and reveal existing gaps between informal transfer of knowledge and structured knowledge management (KM), as well as librarians' resourcefulness. Library directors use KM strategies, mentoring, and involvement with communities of practice to foster innovation.     

Refuge from crisis: refugee women build political capital

For women who have escaped political crises, NGOs can provide a healing space. This study explores nonformal and informal educational processes that occur in NGOs founded and staffed by refugee women who have resettled in the United States. Interviews and documents demonstrate that the refugee women gain knowledge and skills through participation in the NGO, find their voices through the supportive environment of the NGO and networking with others, and take opportunities to make social change. The results of this research indicate that women gain political capital through NGO participation and that increased support of NGOs can therefore result in increased democratisation.     

Using Constructivist Instructional Design Featured in Two Online Courses: Notes From the Field

Abstract

We thought that the close integration of theory and practice offered by constructivism promises unique opportunities to maximize learning in online courses using interactive software as the primary medium of communication. The purpose of this paper, therefore, is to examine the ‘goodness of fit’ between principles drawn from constructivist theories and the design and implementation of the interactive online course.     

Methodological and Ethical Dilemmas in International Research: school attendance and gender in Ghana

abstract

The paper considers questions of ethics and methodology in international research. An action research project designed for Ghana/UNICEF as part of a consultancy on school attendance is used as a case‐study from which to examine the ethical dilemmas facing consultants and their clients in educational research carried out as part of international aid. Ethical dilemmas of resourcing, ownership, accountability and self‐interest are discussed by the English consultants. It thus has a double purpose. It both contributes to research on school attendance, and also furthers debate about methodology and constraints on it.