Demonstration of the Effect of Centre of Mass Height on Postural Sway Using Accelerometry for Balance Analysis

OJIE, Oseikhuemen Osemekhian Davis, SAATCHI, Reza and SAATCHI, Mahdieh (2020). Demonstration of the Effect of Centre of Mass Height on Postural Sway Using Accelerometry for Balance Analysis. Technologies, 8 (2), e20.

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Abstract

The effect of center of mass (COM) height on stand-still postural sway analysis was studied. For this purpose, a measurement apparatus was set up that included an accelerometry unit attached to a rod: three plumb lines, positioned at 50 cm, 75 cm, and 100 cm to the end of the rod, each supported a plumb bob. Using a vice mechanism, the rod was inclined from vertical (0 degree inclination) in steps of 5 degrees to 90 degrees. For each inclination, the corresponding inclination angle was manually measured by a protractor, and the positions of the three plumb bobs on the ground surface were also manually measured using a tape measure. Algebraic operations were used to calculate the inclination angle and the associated displacements of the plumb bobs on the ground surface from the accelerometry data. For each inclination angle, the manual and accelerometry calculated ground displacement produced by each plumb bulb were close. It was demonstrated that the height of COM, where the measurement was taken, affected the projected displacement on the ground surface. A higher height produced a greater displacement. This effect has an implication in postural sway analysis where the accelerometry readings may need comparison amongst subjects with different COM heights. To overcome this, a method that normalized the accelerometry readings by considering the COM height was proposed, and the associated results were presented.

Item Type:	Article
Additional Information:	** From MDPI via Jisc Publications Router ** Licence for this article: https://creativecommons.org/licenses/by/4.0/ **Journal IDs: eissn 2227-7080 **History: published 22-04-2020; accepted 21-04-2020
Uncontrolled Keywords:	center of mass, balance analysis, accelerometry, inverted pendulum measurement
Identification Number:	https://doi.org/10.3390/technologies8020020
Page Range:	e20
SWORD Depositor:	Colin Knott
Depositing User:	Colin Knott
Date Deposited:	24 Apr 2020 10:09
Last Modified:	18 Mar 2021 01:17
URI:	https://shura.shu.ac.uk/id/eprint/26164

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