eCite Digital Repository

Choice stepping response and transfer times: effects of age, fall risk, and secondary tasks

Citation

St George, RJ and Fitzpatrick, RC and Rogers, MW and Lord, SR, Choice stepping response and transfer times: effects of age, fall risk, and secondary tasks, Journal of Gerontology, 62A, (5) pp. 537-542. ISSN 1079-5006 (2007) [Refereed Article]

Copyright Statement

Copyright 2007 by The Gerontological Society of America

DOI: doi:10.1093/gerona/62.5.537

Abstract

Background: Deterioration with age of physiological components of balance control increases fall risk. Avoiding a fall can also require higher level cognitive processing to select correct motor and stepping responses. Here we investigate how a competing cognitive task and an obstacle to stepping affect the initiation and execution phases of choice stepping reaction times in young and older people.

Methods: Three groups were studied: young persons (YOUNG: 23-40 years, n = 20), older persons with a low risk of falls (OLR: 75-86 years, n = 18), and older persons with a high risk of falls (OHR: 78-88 years, n = 22). Four conditions were examined: choice stepping, choice stepping + obstacle, choice stepping + working memory task, and choice stepping + working memory task + obstacle. Step response and transfer times were measured for each condition, in addition to hesitant stepping, contacts with the obstacle and errors made in the memory test.

Results: Older participant groups had significantly longer response and transfer times than the young group had, and the OHR group had significantly longer response and transfer times than the OLR group had. There was a significant Group x Secondary task interaction for response time (F2,215 = 12.6, p < 0.001). With the memory task, response time was minimally affected in the YOUNG (7% increase, p = 0.11) but was slowed significantly in the OLR fallers (42% increase, p < 0.001) and more so in the OHR fallers (48% increase, p < 0.001). The obstacle had a small but significant effect on response time (9.4%) and a larger effect on transfer time (43.3%), with no differences among the groups. Errors in stepping, performing the secondary task and contacting the obstacle increased with age and fall risk.

Conclusions: Compared with young people, older people, and more so those at risk of falling, have an impaired ability to initiate and execute quick, accurate voluntary steps, particularly in situations where attention is divided.

Item Details

Item Type:Refereed Article
Keywords:stepping, aged, dual-task
Research Division:Medical and Health Sciences
Research Group:Human Movement and Sports Science
Research Field:Motor Control
Objective Division:Health
Objective Group:Clinical Health (Organs, Diseases and Abnormal Conditions)
Objective Field:Neurodegenerative Disorders Related to Ageing
Author:St George, RJ (Dr Rebecca St George)
ID Code:116433
Year Published:2007
Deposited By:Psychology
Deposited On:2017-05-10
Last Modified:2017-07-26
Downloads:0

Repository Staff Only: item control page