The effects of cognitive task on postural stability in older adults with and without osteoarthritic changes at the knee

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The effects of cognitive task on postural stability in older adults with and without osteoarthritic changes at the knee


Author: Chung, Mun-hung Mandy
Title: The effects of cognitive task on postural stability in older adults with and without osteoarthritic changes at the knee
Degree: M.Sc.
Year: 2002
Subject: Hong Kong Polytechnic University -- Dissertations
Aging -- Physiological aspects
Musculoskeletal system -- Aging
Task analysis
Department: Multi-disciplinary Studies
Dept. of Rehabilitation Sciences
Pages: x, 91 leaves : ill. ; 30 cm
Language: English
InnoPac Record:
Abstract: The elderly population is increasing in Hong Kong. With aging, there will be a decline in balance control. Moreover, cognitive task, which is commonly performed in the elderly in daily activities, would further challenge the postural control system. Apart from that, pathological changes, such as osteoarthritis (OA) would affect the joint position sense and motor function, which might influence the postural control in these patients. It was the intent of this study to investigate the influence of cognitive task in balance control in double and single legs, in healthy elderly and elderly with OA change. In addition, correlation between balance control in stance and functional task was investigated. It was a cross-sectional design and a comparative study. Twenty healthy elderly and three elderly with OA knee changes were invited to participate in this study. Each subject underwent static and functional tests with and without cognitive task at the Hong Kong Polytechnic University. Balance control in single and double legs stance were assessed using one force plate (Kistler, model no. 9286AA, Switzerland). Timed "Up & Go" test was used for the functional testing. Cognitive task (subtraction task) was given to the elderly while they were performing the balance and functional tests. Results from this study showed that there was satisfactory reliability in medio-lateral (M/L) sway amplitude (ICC4,k=0.45 to 0.97), anteroposterior (A/P) sway velocity (ICC4,k=0.64 to 0.99) in static balance test, and the Timed "Up and Go" test (ICC4,k=0.94). Using the above reliable outcome measures, we found that dual task caused an increase in the postural sway in sway amplitude and sway velocity in single leg stance (p<0.05), and the time to complete the Timed "Up and Go" test (p< 0.05). In addition, there was positive correlation between the static balance test in single leg stance and the fhnctional test (M/L sway amplitude, r=0.41 to 0.45, p< 0.000), and a negative correlation in double legs stance and functional test (A/P sway velocity, r=-0.37, p=0.004) in single task. From the above investigation, it gives information how cognitive function affects the balance control which may be useful in developing intervention programs to increase postural stability in the elderly.

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