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Estimation of minimum ground clearance (MGC) using body-worn inertial sensors

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

McGrath, Denise, Greene, Barry, Walsh, Cathal and Caulfield, Brian (2011) Estimation of minimum ground clearance (MGC) using body-worn inertial sensors. Journal of Biomechanics, 44 . pp. 1083-1088. [Journal article]

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DOI: 10.1016/j.jbiomech.2011.01.034

Abstract

Objective assessment of balance and mobility in elderly populations using body-worn sensors has recently become a prevalent theme in falls-related research. Recent research by the authors identified mean absolute-valued vertical angular velocity measured using shank mounted inertial sensors during a timed-up-and-go test as having a strong association with falls history in a group of elderly adults. This study aimed to investigate the clinical relevance of this parameter by exploring the relationship between it and minimum ground clearance (MGC) measured with an optical motion capture system. MGC is an important variable when considering trip-related falls risk. This paper also presents a method of estimating properties of MGC during walking, across a range of speeds and gait patterns, using body-worn inertial sensors. We found that mean MGC and coefficient of variation (CV) MGC are correlated with mean absolute-valued vertical angular velocity and acceleration as measured by shank or foot mounted inertial sensors. Regression models generated using inertial sensor derived variables were used to robustly estimate the mean MGC and CV MGC measured by an optical marker-tracking system. Foot-mounted sensors were found to yield slightly better results than sensors on the shank. Different walking speeds and gait patterns were not found to influence the accuracy of the models. We conclude that these findings have the potential to evaluate a walking trial using body-worn inertial sensors, which could then be used to identify individuals with increased risk of unprovoked collisions with the ground during locomotion.

Item Type:Journal article
Keywords:Inertial sensor; Minimum ground clearance; Falls risk.
Faculties and Schools:Faculty of Life and Health Sciences
Faculty of Life and Health Sciences > Ulster Sports Academy
Research Institutes and Groups:Sport and Exercise Sciences Research Institute
Sport and Exercise Sciences Research Institute > Centre for Sports Science and Sports Medicine
ID Code:24145
Deposited By:Dr Denise McGrath
Deposited On:21 Nov 2012 10:13
Last Modified:21 Nov 2012 10:13

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