The interacting effects of cognitive demand and recovery and postural stability in balance-impaired elderly persons

Brauer, Sandra G., Woollacott, Marjorie and Shumway-Cook, Anne (2001) The interacting effects of cognitive demand and recovery and postural stability in balance-impaired elderly persons. Journals of Gerontology Series A-biological Sciences And Medical Sciences, 56 8: M489-M496.

Author Brauer, Sandra G.
Woollacott, Marjorie
Shumway-Cook, Anne
Title The interacting effects of cognitive demand and recovery and postural stability in balance-impaired elderly persons
Journal name Journals of Gerontology Series A-biological Sciences And Medical Sciences   Check publisher's open access policy
ISSN 1079-5006
Publication date 2001-08-01
Year available 2001
Sub-type Article (original research)
Volume 56
Issue 8
Start page M489
End page M496
Total pages 8
Place of publication Springfield, Ill
Publisher Oxford Univerisity Press
Language eng
Subject 110308 Geriatrics and Gerontology
Abstract Background. Although postural recovery is attentionally demanding in healthy elderly persons, an inability to recover balance due to competition for attentional resources between the postural system and a second task could contribute to falls in older adults with poor balance. This study examined the attentional demands of balance recovery from a mild postural disturbance in balance-impaired elderly persons. A second purpose of this research was to determine the effect of performing a cognitive task on the recovery of balance in balance-impaired elderly persons. Methods. Fifteen healthy older adults and 13 older adults with clinical balance impairment were exposed to balance disturbances by means of sudden movement of a platform on which they stood. A dual-task paradigm where postural recovery served as the primary task and verbal reaction time to auditory tones served as the. secondary task was used to assess attentional demand. To determine the effect of the cognitive task on postural recovery, kinetic, kinematic, and neuromuscular measures of a feet-in-place response were investigated. Results. Balance recovery using a feet-in-place response was attentionally demanding in both groups of older adults and was more demanding in balance-impaired than in healthy elderly persons. With the concurrent performance of a cognitive task, balance-impaired elderly persons took longer to stabilize their center of pressure and regain balance than in a sing le task, while healthy elderly persons showed no change between conditions. In addition, only balance-impaired elderly individuals had a greater center-of-pressure resultant velocity during recovery in a dual-task compared with a single-task Situation. Conclusions. The ability to recover balance using a feet-in-place response was more attentionally demanding in balance-impaired than in healthy elderly persons. The recovery of balance was also slower and less efficient in balance-impaired elderly persons when simultaneously performing a cognitive task, whereas the ability of healthy elderly individuals to recover was not influenced by concurrent task demands. This suggests that dual-task performance may contribute to postural instability and falls in balance-impaired elderly individuals.
Keyword Geriatrics
Gerontology
Attentional Demands
Falls
Mobility
Adults
Task
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID AG-05317
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Health and Rehabilitation Sciences Publications
 
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Created: Wed, 17 Oct 2007, 20:28:24 EST