Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/16972
Title: Effects of lighting illuminance levels on stair negotiation performance in individuals with visual impairment
Authors: Shaheen, AF
Sourlas, A
Horton, K
McLean, C
Ewins, D
Gould, D
Ghoussayni, S
Keywords: lighting;vision;temporal-spatial parameters;clearance;clearance variability;kinematics
Issue Date: 2018
Publisher: Elsevier
Citation: Journal of Electromyography and Kinesiology, 2018, 39 pp. 8 - 15
Abstract: Background Stair-related falls of older people cause a substantial financial and social burden. Deterioration of the visual system amongst other factors put older people at a high risk of falling. Improved lighting is often recommended. The aim of this study was to investigate the effect of lighting illuminance on stair negotiation performance in older individuals with visual impairment. Methods Eleven participants aged 60 or over with a vision of 6/18 or worse ascended and descended a staircase under: 50 lx, 100 lx, 200 lx, 300 lx and distributed 200 lx lighting. A motion capture system was used to measure movements of the lower limb. Clearance, clearance variability, temporal and spatial parameters and joint/segment kinematics were computed. Findings There was no effect on clearance or clearance variability. Participants had lower speed, cadence, increased cycle time and stance time in the 50 lx compared to 300 lx and distributed 200 lx lighting in descent. The minimum hip angle in ascent was increased in the 200 lx lighting. Clearance was found to be moderately correlated with balance scores. Interpretation Individuals with visual impairment adopt precautionary gait in dim lighting conditions. This does not always result in improvements in the parameters associated with risk of falling (e.g. clearance).Background Stair-related falls of older people cause a substantial financial and social burden. Deterioration of the visual system amongst other factors put older people at a high risk of falling. Improved lighting is often recommended. The aim of this study was to investigate the effect of lighting illuminance on stair negotiation performance in older individuals with visual impairment. Methods Eleven participants aged 60 or over with a vision of 6/18 or worse ascended and descended a staircase under: 50 lx, 100 lx, 200 lx, 300 lx and distributed 200 lx lighting. A motion capture system was used to measure movements of the lower limb. Clearance, clearance variability, temporal and spatial parameters and joint/segment kinematics were computed. Findings There was no effect on clearance or clearance variability. Participants had lower speed, cadence, increased cycle time and stance time in the 50 lx compared to 300 lx and distributed 200 lx lighting in descent. The minimum hip angle in ascent was increased in the 200 lx lighting. Clearance was found to be moderately correlated with balance scores. Interpretation Individuals with visual impairment adopt precautionary gait in dim lighting conditions. This does not always result in improvements in the parameters associated with risk of falling (e.g. clearance).
URI: http://bura.brunel.ac.uk/handle/2438/16972
DOI: http://dx.doi.org/10.1016/j.jelekin.2018.01.004
ISSN: 1050-6411
http://dx.doi.org/10.1016/j.jelekin.2018.01.004
Appears in Collections:Dept of Life Sciences Embargoed Research Papers

Files in This Item:
File Description SizeFormat 
Fulltext.pdf1.92 MBAdobe PDFView/Open    Request a copy


Items in BURA are protected by copyright, with all rights reserved, unless otherwise indicated.