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Regional associations of cortical thickness with gait variability - The Tasmanian Study of Cognition and Gait

Jayakody, O, Breslin, M ORCID: 0000-0002-8135-3136, Beare, R, Blumen, HM, Srikanth, VK and Callisaya, ML ORCID: 0000-0003-2122-1622 2020 , 'Regional associations of cortical thickness with gait variability - The Tasmanian Study of Cognition and Gait' , Journals of Gerontology. Series A: Biological Sciences and Medical Sciences, vol. 75, no. 8 , 1537–1544 , doi: 10.1093/gerona/glaa118.

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Abstract

Background: Gait variability is a marker of cognitive decline. However, there is limited understanding of the cortical regions associated with gait variability. We examined associations between regional cortical thickness and gait variability in a population-based sample of older people without dementia. Method: Participants (n = 350, mean age 71.9 ± 7.1) were randomly selected from the electoral roll. Variability in step time, step length, step width, and double support time (DST) were calculated as the standard deviation of each measure, obtained from the GAITRite walkway. Magnetic resonance imaging (MRI) scans were processed through FreeSurfer to obtain cortical thickness of 68 regions. Bayesian regression was used to determine regional associations of mean cortical thickness and thickness ratio (regional thickness/overall mean thickness) with gait variability. Results: Smaller global cortical thickness was only associated with greater step width and step time variability. Smaller mean thickness in widespread regions important for sensory, cognitive, and motor functions were associated with greater step width and step time variability. In contrast, smaller thickness in a few frontal and temporal regions were associated with DST variability and the right cuneus was associated with step length variability. Smaller thickness ratio in frontal and temporal regions important for motor planning, execution, and sensory function and greater thickness ratio in the anterior cingulate was associated with greater variability in all measures. Conclusions: Examining individual cortical regions is important in understanding the relationship between gray matter and gait variability. Cortical thickness ratio highlights that smaller regional thickness relative to global thickness may be important for the consistency of gait.

Item Type: Article
Authors/Creators:Jayakody, O and Breslin, M and Beare, R and Blumen, HM and Srikanth, VK and Callisaya, ML
Keywords: gait speed, overall mean cortical thickness, population-based, regional cortical thickness, regional thickness ratio
Journal or Publication Title: Journals of Gerontology. Series A: Biological Sciences and Medical Sciences
Publisher: Gerontological Society Amer
ISSN: 1079-5006
DOI / ID Number: 10.1093/gerona/glaa118
Copyright Information:

© The Author(s) 2020. Published by Oxford University Press on behalf of The Gerontological Society of America.

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