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Front Aging Neurosci. 2017 May 23;9:155. doi: 10.3389/fnagi.2017.00155. eCollection 2017.

Associations between Mobility, Cognition, and Brain Structure in Healthy Older Adults.

Frontiers in aging neuroscience

Naiara Demnitz, Enikő Zsoldos, Abda Mahmood, Clare E Mackay, Mika Kivimäki, Archana Singh-Manoux, Helen Dawes, Heidi Johansen-Berg, Klaus P Ebmeier, Claire E Sexton

Affiliations

  1. Department of Psychiatry, University of Oxford, Warneford HospitalOxford, United Kingdom.
  2. Oxford Centre for Functional MRI of the Brain, Nuffield Department of Clinical Neurosciences, University of OxfordJohn Radcliffe Hospital, Oxford, United Kingdom.
  3. Department of Epidemiology and Public Health, University College LondonLondon, United Kingdom.
  4. Oxford Institute of Nursing, Midwifery and Allied Health Research, Oxford Brookes UniversityOxford, United Kingdom.

PMID: 28588477 PMCID: PMC5440513 DOI: 10.3389/fnagi.2017.00155

Abstract

Mobility limitations lead to a cascade of adverse events in old age, yet the neural and cognitive correlates of mobility performance in older adults remain poorly understood. In a sample of 387 adults (mean age 69.0 ± 5.1 years), we tested the relationship between mobility measures, cognitive assessments, and MRI markers of brain structure. Mobility was assessed in 2007-2009, using gait, balance and chair-stands tests. In 2012-2015, cognitive testing assessed executive function, memory and processing-speed; gray matter volumes (GMV) were examined using voxel-based morphometry, and white matter microstructure was assessed using tract-based spatial statistics of fractional anisotropy, axial diffusivity (AD), and radial diffusivity (RD). All mobility measures were positively associated with processing-speed. Faster walking speed was also correlated with higher executive function, while memory was not associated with any mobility measure. Increased GMV within the cerebellum, basal ganglia, post-central gyrus, and superior parietal lobe was associated with better mobility. In addition, better performance on the chair-stands test was correlated with decreased RD and AD. Overall, our results indicate that, even in non-clinical populations, mobility measures can be sensitive to sub-clinical variance in cognition and brain structures.

Keywords: MRI; aging; balance; cognition; gait; gray matter; mobility

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