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BMC Geriatrics

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Open Access 01-12-2021 | Research

Task matters: an investigation on the effect of different secondary tasks on dual-task gait in older adults

Authors: Hui-Ting Goh, Miranda Pearce, Asha Vas

Published in: BMC Geriatrics | Issue 1/2021

Abstract

Background

Dual-task gait performance declines as humans age, leading to increased fall risk among older adults. It is unclear whether different secondary cognitive tasks mediate age-related decline in dual-task gait. This study aimed to examine how type and difficulty level of the secondary cognitive tasks differentially affect dual-task gait in older adults.

Methods

Twenty young and twenty older adults participated in this single-session study. We employed four different types of secondary tasks and each consisted of two difficulty levels, yielding eight different dual-task conditions. The dual-task conditions included walking and 1) counting backward by 3 s or by 7 s; 2) remembering a 5-item or 7-item lists; 3) responding to a simple or choice reaction time tasks; 4) generating words from single or alternated categories. Gait speed and cognitive task performance under single- and dual-task conditions were used to compute dual-task cost (DTC, %) with a greater DTC indicating a worse performance.

Results

A significant three-way interaction was found for the gait speed DTC (p = .04). Increased difficulty in the reaction time task significantly increased gait speed DTC for older adults (p = .01) but not for young adults (p = .90). In contrast, increased difficulty level in the counting backward task significantly increased gait speed DTC for young adults (p = .03) but not for older adults (p = .85). Both groups responded similarly to the increased task difficulty in the other two tasks.

Conclusions

Older adults demonstrated a different response to dual-task challenges than young adults. Aging might have different impacts on various cognitive domains and result in distinctive dual-task gait interference patterns.

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Title: Task matters: an investigation on the effect of different secondary tasks on dual-task gait in older adults
Authors: Hui-Ting Goh
Miranda Pearce
Asha Vas
Publication date: 01-12-2021
Publisher: BioMed Central
Published in: BMC Geriatrics / Issue 1/2021
Electronic ISSN: 1471-2318
DOI: https://doi.org/10.1186/s12877-021-02464-8

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