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- W2794155394 abstract "Higher amyloid burden predicts gait slowing in aging. Whether and which gait characteristics are associated with amyloid burden is less clear. Gait variability may be more sensitive to amyloid burden than mean gait characteristics. In the Baltimore Longitudinal Study of Aging, 99 older participants without neurological disease had concurrent amyloid imaging and assessment of gait characteristics. β-amyloid burden was measured using 11C-Pittsburgh compound B (PiB) positron emission tomography. PiB+/− status was based on a mean cortical distribution volume ratio (DVR) cut point. Gait characteristics were quantified by 3D motion analysis. Cross-sectional associations of PiB+/− status and DVR in motor-related regions (primary motor cortex, putamen, caudate) with gait characteristics were examined using linear regression, adjusted for age, sex, height, body mass index, gait speed and covariates (memory, executive function, visuoperceptual speed, depressive symptoms, cardiovascular risk, ApoE ε4, cerebrovascular burden, neurodegeneration, peripheral arterial disease, knee pain). Being PiB+ and higher DVR in motor-related regions were associated with greater gait speed variability, cadence variability, and gait cycle time variability but not with mean gait characteristics. Associations remained similar after adjustment for gait speed and covariates, except for memory, which attenuated associations of PiB+/− with cadence variability and gait cycle time variability. Associations were prominent in men but were not found in women. In usual aging, integrated temporal gait variability measures, but not mean performance, appear related to amyloid burden from cortical and motor-related cortical and subcortical regions, especially in men. Increased gait variability may be a subclinical indicator of increased amyloid burden in men." @default.
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- W2794155394 date "2018-03-01" @default.
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- W2794155394 title "β-amyloid deposition is associated with gait variability in usual aging" @default.
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- W2794155394 doi "https://doi.org/10.1016/j.gaitpost.2018.02.002" @default.
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