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iv
also would like to extend my appreciation to the faculty members who taught me
much about biomechanics and movement analysis and provided valuable feedback.
I appreciate my colleagues in the Musculoskeletal Biomechanics
Research Laboratory. You have been generous with your time and perspectives to
help me refining this study. Matthew Sandusky, who kept everything running
efficiently and has made my life as a gradate student easier. I would like to
acknowledge the efforts of Mark Blanchette and Derek Sapico, who worked with me
during the data collection period. Particularly, I would like to thank Yu-Jen (Sam)
Chen and JooEun (June) Song. You have supported me in many different ways over
the years and were always willing to share knowledge, challenge my thought process
and discuss issues with me.
I would like to acknowledge the financial support of the Department of
Biokinesiology and Physical Therapy whose contributions made this dissertation
possible. This dissertation was supported financially in part by awards from the
American Society of Safety Engineers and National Institute for Occupational Safety
and Health, and the Jacqueline Perry Scholarship. I am thankful for John Brault of
Macinnis Engineering Associates, Inc. and Bill Ells of QB soling Inc. for providing
technical consultation and generous support of equipment.
This dissertation would not have been occurred without the study
participants. I am grateful to each of them who were willing to donate their time and
energy with me, especially to the people who we never met before.
Many friends have supported me through these years in this foreign
country. Their support and care helped me to stay focused on my graduate study.
Object Description
| Title | The influence of footwear sole hardness on slip initiation and falls in young adults |
| Author | Tsai, Yi-Ju |
| Author email | yijutsai@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Biokinesiology & Physical Therapy |
| School | School of Dentistry |
| Date defended/completed | 2006-09-20 |
| Date submitted | 2006 |
| Restricted until | Unrestricted |
| Date published | 2006-10-31 |
| Advisor (committee chair) | Powers, Christopher M. |
| Advisor (committee member) |
Salem, George J. Kulig, Kornelia Redfern, Mark Siegmund, Kimberly D. |
| Abstract | The overall objective of this dissertation was to determine the influence of footwear sole hardness on slip initiation and falls. To achieve this goal, three separate studies were undertaken. The purpose of the first study was to determine the influence of sole hardness on peak utilized coefficient of friction (COFu) during walking. Ground reaction forces, full body kinematics, and subjective ratings of footwear slipperiness were obtained from 56 young adults while wearing hard and soft soled shoes. Peak COFu was significantly less when wearing hard soled shoes compared to when wearing soft soled shoes. The decrease in peak COFu was attributed to a decrease in total body center of mass (COM) acceleration prior to and immediately following initial contact. The purpose of the second study was to determine the influence of sole hardness on the probability of slip initiation. Forty young adults were randomized into hard and soft sole groups. Peak COFu was obtained during a non-slippery floor condition while slip probability was assessed during a slippery floor condition. Despite the lower COFu in the hard sole group, the proportion of slip events was found to be greater than the soft sole group. The purpose of third study was to investigate the influence of sole hardness on the probability of slip-induced falls. Slip characteristics and fall probability during a slippery floor trial were compared between hard and soft sole groups. The proportion of fall events in the hard sole group was not statistically different than the proportion of fall events in the soft sole group. In addition, no differences were observed between shoe groups for slip distance, average heel and COM slipping velocity. Collectively, the results of this dissertation support the premise that individuals wearing shoes with hard soles are at greater risk for slip initiation, but not greater risk of falls.; Although individuals demonstrate gait adaptations to reduce the friction demand when wearing hard soled shoes that are perceived to be more slippery, these behavioral adaptations do not appear to decrease the risk of slips. |
| Keyword | footwear; slips and falls; gait; biomechanics; friction |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Type | texts |
| Legacy record ID | usctheses-m117 |
| Contributing entity | University of Southern California |
| Rights | Tsai, Yi-Ju |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | cisadmin@lib.usc.edu |
| Filename | etd-Tsai-20061031 |
| Archival file | uscthesesreloadpub_Volume35/etd-Tsai-20061031.pdf |
Description
| Title | Page 4 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@lib.usc.edu |
| Full text | iv also would like to extend my appreciation to the faculty members who taught me much about biomechanics and movement analysis and provided valuable feedback. I appreciate my colleagues in the Musculoskeletal Biomechanics Research Laboratory. You have been generous with your time and perspectives to help me refining this study. Matthew Sandusky, who kept everything running efficiently and has made my life as a gradate student easier. I would like to acknowledge the efforts of Mark Blanchette and Derek Sapico, who worked with me during the data collection period. Particularly, I would like to thank Yu-Jen (Sam) Chen and JooEun (June) Song. You have supported me in many different ways over the years and were always willing to share knowledge, challenge my thought process and discuss issues with me. I would like to acknowledge the financial support of the Department of Biokinesiology and Physical Therapy whose contributions made this dissertation possible. This dissertation was supported financially in part by awards from the American Society of Safety Engineers and National Institute for Occupational Safety and Health, and the Jacqueline Perry Scholarship. I am thankful for John Brault of Macinnis Engineering Associates, Inc. and Bill Ells of QB soling Inc. for providing technical consultation and generous support of equipment. This dissertation would not have been occurred without the study participants. I am grateful to each of them who were willing to donate their time and energy with me, especially to the people who we never met before. Many friends have supported me through these years in this foreign country. Their support and care helped me to stay focused on my graduate study. |
