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Relationship between transitional acceleration of the whole body center-of-mass and friction demand characteristic during gait.

Authors
Lockhart-TE; Woldstad-JC; Smith-JL
Source
Proceedings of the Human Factors and Ergonomics Society 46th Annual Meeting, September 29 - October 4, 2002, Baltimore, Maryland, Bringing Fundamentals & New Opportunities. Santa Monica, CA: Human Factors and Ergonomics Society, 2002 Sep; 46(Ind Erg):1186-1190
NIOSHTIC No.
20023290
Abstract
A laboratory study was conducted to examine the gait changes associated with "aging and the effect of these changes on initiation of slips, initial friction demand, and slip distance utilizing newly defined biomechanical parameters of slips and falls. Twenty-eight subjects from two age groups (young and old) walked around a circular track at a comfortable pace wearing a safety harness. Slippery floor surface was automatically placed on the walking track over force platforms at "unexpected" random time intervals utilizing remote controlled floor changer. Synchronized kinetic and kinematic measures were obtained on both slippery and non-slippery floor surfaces. The results indicated that older subjects step length was significantly shorter, and transitional acceleration of the whole body center-of-mass (COM) was significantly slower than their younger counterparts. Older subjects initial friction demand as measured by required coefficient friction (RCOF) was not significantly different than their younger counterparts. Additionally, older subjects slipped longer and faster than younger subjects. Bivariate correlation analyses suggested that transitional acceleration of the whole body COM was significantly related to friction demand characteristic (e.g., RCOF). These findings suggest that gait changes associated with aging (especially slower transition of the whole body COM) may affect initiation of slip-induced falls among older adults.
Keywords
Biomechanics; Laboratory-testing; Floors; Surface-properties; Humans; Statistical-analysis; Ergonomics; Age-factors; Age-groups; Walking-surfaces; Human-factors-engineering; Demographic-characteristics; Accident-analysis; Accident-prevention; Accident-potential; Accident-rates; Accident-statistics; Accidents; Injuries; Injury-prevention
CODEN
PHFSDQ
Publication Date
20020901
Document Type
Conference/Symposia Proceedings
Funding Amount
54000
Funding Type
Grant
Fiscal Year
2002
NTIS Accession No.
NTIS Price
ISBN No.
9780945289203
Identifying No.
Grant-Number-K01-OH-007450
Issue of Publication
Ind Erg
ISSN
1071-1813
Priority Area
Work Environment and Workforce: Special Populations
Source Name
Proceedings of the Human Factors and Ergonomics Society 46th Annual Meeting, September 29 - October 4, 2002, Baltimore, Maryland, Bringing Fundamentals & New Opportunities
State
OR; VA; TX
Performing Organization
Virginia Polytechnic Institute and State University
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