Computational Intelligence for Movement Sciences: Neural Networks and Other Emerging Techniques Rezaul Begg, Victoria University, Australia Marimuthu Palaniswami, The University of Melbourne, Australia IDEA GROUP PUBLISHING Hershey • London • Melbourne • Singapore Acquisitions Editor: Michelle Potter Development Editor: Kristin Roth Senior Managing Editor: Amanda Appicello Managing Editor: Jennifer Neidig Copy Editor: Bernard J. Kieklak, Jr. Typesetter: Sharon Berger Cover Design: Lisa Tosheff Printed at: Integrated Book Technology Published in the United States of America by Idea Group Publishing (an imprint of Idea Group Inc.) 701 E. Chocolate Avenue, Suite 200 Hershey PA 17033 Tel: 717-533-8845 Fax: 717-533-8661 E-mail: [email protected] Web site: http://www.idea-group.com and in the United Kingdom by Idea Group Publishing (an imprint of Idea Group Inc.) 3 Henrietta Street Covent Garden London WC2E 8LU Tel: 44 20 7240 0856 Fax: 44 20 7379 0609 Web site: http://www.eurospanonline.com Copyright © 2006 by Idea Group Inc. All rights reserved. No part of this book may be reproduced, stored or distributed in any form or by any means, electronic or mechanical, including photocopying, without written permission from the publisher. Product or company names used in this book are for identification purposes only. Inclusion of the names of the products or companies does not indicate a claim of ownership by IGI of the trademark or registered trademark. Library of Congress Cataloging-in-Publication Data Computational intelligence for movement sciences : neural networks, support vector machines, and other emerging techniques / Rezaul Begg and Marimuthu Palaniswami, editors. p. ; cm. Includes bibliographical references and index. Summary: "This book provides information regarding state-of-the-art research outcomes and cutting- edge technology on various aspects of the human movement"--Provided by publisher. ISBN 1-59140-836-9 (hardcover) -- ISBN 1-59140-837-7 (softcover) 1. Musculoskeletal system--Physiology. 2. Human locomotion. 3. Artificial intelligence. 4. Neural networks (Computer science) [DNLM: 1. Movement--physiology. 2. Artificial Intelligence. 3. Biomechanics. 4. Models, Biological. 5. Neural Networks (Computer) WE 103 C7383 2006] I. Begg, Rezaul. II. Palaniswami, Marimuthu. QP301.C588 2006 612.7'0285--dc22 2005032065 British Cataloguing in Publication Data A Cataloguing in Publication record for this book is available from the British Library. All work contributed to this book is new, previously-unpublished material. The views expressed in this book are those of the authors, but not necessarily of the publisher. IGP Forthcoming Titles in the Computational Intelligence and Its Applications Series Advances in Applied Artificial Intelligence (March 2006 release) John Fulcher ISBN: 1-59140-827-X Paperback ISBN: 1-59140-828-8 eISBN: 1-59140-829-6 Computational Economics: A Perspective from Computational Intelligence (November 2005 release) Shu-Heng Chen, Lakhmi Jain, and Chung-Ching Tai ISBN: 1-59140-649-8 Paperback ISBN: 1-59140-650-1 eISBN: 1-59140-651-X Computational Intelligence for Movement Sciences: Neural Networks, Support Vector Machines and Other Emerging Techniques (February 2006 release) Rezaul Begg and Marimuthu Palaniswami ISBN: 1-59140-836-9 Paperback ISBN: 1-59140-837-7 eISBN: 1-59140-838-5 An Imitation-Based Approach to Modeling Homogenous Agents Societies (July 2006 release) Goran Trajkovski ISBN: 1-59140-839-3 Paperback ISBN: 1-59140-840-7 eISBN: 1-59140-841-5 It’s Easy to Order! Visit www.idea-group.com! 717/533-8845 x10 Mon-Fri 8:30 am-5:00 pm (est) or fax 24 hours a day 717/533-8661 IDEA GROUP PUBLISHING Hershey • London • Melbourne • Singapore Excellent additions to your library! Computational Intelligence for Movement Sciences: Neural Networks and Other Emerging Techniques Table of Contents Preface .........................................................................................................................vii Section I: Methods and Tools for Movement Analysis Chapter I Overview of Movement Analysis and Gait Features.......................................................1 Russell Best, Victoria University, Australia Rezaul Begg, Victoria University, Australia Chapter II Inertial Sensing in Biomechanics: A Survey of Computational Techniques Bridging Motion Analysis and Personal Navigation.................................................................. 70 Angelo M. Sabatini, ARTS Lab, Scuola Superiore Sant’Anna, Italy Chapter III Monitoring Human Movement with Body-Fixed Sensors and its Clinical Applications...............................................................................................................101 Kamiar Aminian, Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland Chapter IV Computational Intelligence Techniques...................................................................139 Bharat Sundaram, The University of Melbourne, Australia Marimuthu Palaniswami, The University of Melbourne, Australia Alistair Shilton, The University of Melbourne, Australia Rezaul Begg, Victoria University, Australia Section II: Advances in Gait Analysis and Modelling Chapter V Modelling of Some Aspects of Skilled Locomotor Behaviour Using Artificial Neural Networks.......................................................................................................172 Stephen D. Prentice, University of Waterloo, Canada Aftab E. Patla, University of Waterloo, Canada Chapter VI Visualisation of Clinical Gait Data Using a Self-Organising Artificial Neural Network..................................................................................................................... 197 Gabor J. Barton, Liverpool John Moores University, UK Chapter VII Neural Network Models for Estimation of Balance Control, Detection of Imbalance, and Estimation of Falls Risk...................................................................217 Michael E. Hahn, Montana State University, USA Arthur M. Farley, University of Oregon, USA Li-Shan Chou, University of Oregon, USA Chapter VIII Recognition of Gait Patterns Using Support Vector Machines ............................... 243 Rezaul Begg, Victoria University, Australia Marimuthu Palaniswami, The University of Melbourne, Australia Section III: Applications in Rehabilitation and Sport Chapter IX Control of Man-Machine FES Systems..................................................................... 263 Rahman Davoodi, University of Southern California, USA Gerald E. Loeb, University of Southern California, USA Chapter X Evolutionary Methods for Analysis of Human Movement.........................................281 Rahman Davoodi, University of Southern California, USA Gerald E. Loeb, University of Southern California, USA Chapter XI Dynamic Pattern Recognition in Sport by Means of Artificial Neural Networks ... 299 Jürgen Perl, Johannes Gutenberg University, Germany Peter Dauscher, Johannes Gutenberg University, Germany Section IV: Computational Modelling for Predicting Movement Forces Chapter XII Estimation of Muscle Forces About the Ankle During Gait in Healthy and Neurologically Impaired Subjects ............................................................................320 Daniel N. Bassett, University of Delaware, USA Joseph D. Gardinier, University of Delaware, USA Kurt T. Manal, University of Delaware, USA Thomas S. Buchanan, University of Delaware, USA Chapter XIII Computational Modelling in Shoulder Biomechanics..............................................348 David C. Ackland, The University of Melbourne, Australia Cheryl J. Goodwin, The University of Texas at Austin, USA Marcus G. Pandy, The University of Melbourne, Australia About the Authors.....................................................................................................385 Index ........................................................................................................................391 vii Preface Studies into human movement sciences have been usually undertaken from an interdisciplinary perspective. Individuals and groups who are involved in movement science research come from a number of diverse backgrounds, including: biomechan- ics, biomedical engineering, health science, exercise science, sports science, computer science, clinical science, physiotherapy, prosthetics and orthotics, to name a few. Re- search and development in movement sciences are progressing quite rapidly. The main aims of these advances are to gain a better understanding of the normal and abnormal human movement characteristics, and also to develop new and innovative ways of combating the rising health care costs around the globe. Analysis of gait and other human movements has proved very useful in revealing many useful insights into the recognition and assessment of movement abnormalities. In recent times, gait analysis is taken almost as a routine procedure in aiding many diagnostic and rehabilitative procedures. Common application examples include: the design of a rehabilitation pro- gram to assist the disabled, the planning and assessment of surgical outcomes, the recognition of gaits due to falls-risk in the elderly and also for the improvement of sports techniques and performance. Computational intelligence (CI) encompasses approaches primarily based on arti- ficial neural networks, fuzzy logic rules, evolutionary algorithms and support vector machines. These methods have been applied to solve many complex and diverse prob- lems. Recent years have seen many new developments in CI techniques and conse- quently this has led to an exponential increase in the number of applications in a variety of areas including engineering, finance, social and biomedical. In particular, CI tech- niques are increasingly being used in biomedical and human movement areas because of the complexity of the biological systems as well as the limitations of the existing quantitative techniques in modelling. The contents of this book cover a wide range of relevant applications in human movement sciences written by leading researchers and academicians in the area. Altogether, the book has 13 chapters organized into the fol- lowing four sections: • Section I: Methods and Tools for Movement Analysis • Section II: Advances in Gait Analysis and Modelling • Section III: Applications in Rehabilitation and Sport • Section IV: Computational Modelling for Predicting Movement Forces viii Section I has four chapters that are aimed to provide the readers with a compre- hensive overview of the various approaches and techniques for analysing human move- ments. The first chapter provides a comprehensive overview of the traditional move- ment analysis techniques, potential errors and noise contents in the captured data and some of the major data processing and analysis techniques. Feature extraction is an important process in movement analysis tasks and forms an integral part of a comput- erized data analysis procedure. An extensive overview of the techniques that could be used to derive features from the processed data is presented. In addition to the labora- tory-based measurement techniques, alternative approaches using body-mounted in- ertial sensing have received considerable attention in recent years, especially for am- bulatory monitoring of human motion during various activities. One major advantage of body-mounted inertial sensing in the biomedical domain is its capability to objectively determine a person’s level of functional ability in independent living. The next two chapters focus on such techniques and their applications including: sensor configura- tions and reviews, computational techniques for automatic recognition of activity, quan- titative analysis of motor performance, and personal navigation systems. Significant clinical applications (e.g., in orthopedics, Parkinson disease, aging, etc.) as well as potential applications in nanotechnology, materials sciences, and advanced mobile and ubiquitous body movement are discussed. The final chapter in this section presents a brief description of the major computational intelligence techniques for pattern recog- nition and modelling tasks that often appear in biomedical, health and human move- ment research. These include techniques such as artificial neural networks, fuzzy logic rules, evolutionary approaches, support vector machines, and also approaches that combine two or more techniques (hybrid). Section II includes four chapters that focus on applications of neural networks and other CI techniques for analysing, modelling and visualizing gait data. Neural networks have been predominantly used in most gait recognition, classification and modelling tasks. The first chapter in this section examines the use of artificial neural networks to model and probe the control of walking movements. Chapter VI describes self-organising artificial neural networks and their use to reduce the complexity of gait data and to improve visualisation of large amounts of complex data in a two-dimen- sional map. The next two chapters focus on recognition of gait changes due to aging and falling behaviour. With significant increase in the number of aging population around the world, and falls in older adults being a major public health issue, researchers are looking for ways to reduce the falls risk incidence in older adults and to improve aging health care. Chapter VII looks into gait pattern changes in the elderly and demonstrates the effectiveness of artificial neural network modelling in mapping gait measurements onto reduced function in the balance control system. Chapter VIII describes an auto- mated gait pattern recognition system using gait classifier based on support vector machines. Section III explores applications of CI techniques in rehabilitation and sport- related areas. Chapter IX provides a brief description of different methods for the control of man-machine FES systems and talks about a clinical FES system to demon- strate the successful application of these strategies. Specially, application involving FES systems for the restoration of movement to the paralyzed limbs in spinal cord injury patients is discussed. In Chapter X, evolutionary methods are introduced — these are intelligent systems that can further our understanding of human movement ix and help us devise new treatments. The evolutionary methods resemble the biological processes that led to the development of natural human movement, and they can solve optimization and learning problems that cannot be solved with existing methods. Evo- lutionary computation is well suited to parallel processing that can reduce the compu- tation time significantly and can be applied extensively to treating human movement disorders. In this chapter, the authors discuss applications of evolutionary methods to explore feasible movement patterns that can be used to prescribe movement therapies to improve the existing functions or design FES control systems to restore the lost movement. Chapter XI provides applications of self-organising artificial neural networks for analysing sport games, motor activities or rehabilitation. Such processes are often characterized by a complex structure. Measurements considering them may produce a huge amount of data. This chapter presents neural network approaches and examples of application in the field of sport. Section IV focuses on computational modelling approaches to estimate internal joint forces during movement. Specifically, Chapter XII deals with biomechanical model of the forces about the ankle joint applicable to both unimpaired and neurologically impaired subjects. An EMG-driven hybrid forward and inverse dynamics model of the ankle is employed and optimization procedures are discussed that are used to tune the physiological parameters for the model for each subject. The final chapter describes computational modelling of the shoulder complex. Following a brief background in anatomy and biomechanics of the shoulder complex the authors present a review of the essential functions of the shoulder and the impor- tant features of practical shoulder models. Computational modelling techniques, and also in vivo and in vitro methods for verifying computational models are briefly dis- cussed and a summary of the emerging trends are presented to indicate the clinical impact of computational modeling. The book contains information regarding state-of-the art research outcomes and cutting-edge technology from the leading scientists and researchers working on vari- ous aspects of the human movement. It is hoped that the book will be of enormous help to a broad spectrum of readerships including researchers, professionals, lecturers and graduate students from a wide range of disciplines. It is our belief that the ideas pre- sented in this book will trigger further works and research efforts in this rapidly expand- ing multidisciplinary area. Rezaul Begg, Victoria University, Australia Marimuthu Palaniswami, The University of Melbourne, Australia Editors
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