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The associations between dual-task walking under three different interference conditions and cognitive function

Jayakody, O, Breslin, M ORCID: 0000-0002-8135-3136, Stuart, K ORCID: 0000-0002-7872-4231, Vickers, JC ORCID: 0000-0001-5671-4879 and Callisaya, ML ORCID: 0000-0003-2122-1622 2020 , 'The associations between dual-task walking under three different interference conditions and cognitive function' , Gait and Posture, vol. 82 , pp. 174-180 , doi: 10.1016/j.gaitpost.2020.08.113.

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Background & aims: Dual-task walking is an emerging marker of cognitive impairment. However, there is uncertainty regarding which dual-task test and measure to use. The aims of this study were to determine the association between three different dual-tasks and 1) global cognition and 2) individual cognitive domains. Methods: Participants (n = 91) were adults aged between 56-83 years (mean 68.8, SD 6.7). Under single- and dual-task, gait speed was obtained using a computerized mat. For the dual-task there were three conditions: 1) reciting alternate letters of the alphabet (DT-alpha); 2) counting backwards in 3 s (DT-counting); and 3) recalling words from a shopping list (DT-recall). Dual-task interference in gait and cognition were calculated as: (dual task-single task)/single task×100 and summed to obtain total interference. The cognitive domains of executive function, processing speed, working memory, verbal fluency, visuospatial function and verbal memory (recall and recognition) were assessed using a battery of neuropsychological tests. Raw test scores were subjected to principal component analysis to derive a global cognition score. Partial correlations were used to determine the strength of associations between single- and dual-task measures and cognitive scores, adjusting for age, sex and education. Results: The strongest significant associations for each cognitive outcome variable were between greater total interference under DT-alpha and lower global cognition (r = 0.25), working memory (r = 0.28) and verbal memory [recognition] (r = 0.21), greater gait interference under DT-alpha and slower processing speed (r = 0.43) and single-task gait speed and verbal fluency (r = 0.23). Associations between dual-task measures and cognition were generally weaker under the DT-counting and DT-recall. Significance: Calculating total and gait interference during DT-alpha may be the most useful in order to identify adults with poorer cognition.

Item Type: Article
Authors/Creators:Jayakody, O and Breslin, M and Stuart, K and Vickers, JC and Callisaya, ML
Keywords: cognition, dementia, dual-task walking, gait, primary health care
Journal or Publication Title: Gait and Posture
Publisher: Elsevier Sci Ireland Ltd
ISSN: 0966-6362
DOI / ID Number: 10.1016/j.gaitpost.2020.08.113
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Copyright 2020 Elsevier B.V. All rights reserved.

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