Cognitive Correlates of Timed Up and Go Subtasks in Older People With Preserved Cognition, Mild Cognitive Impairment, and Alzheimer's Disease.
OBJECTIVE
To determine whether impaired Timed Up and Go Test (TUG) subtask performances are associated with specific cognitive domains among older people with preserved cognition (PC), mild cognitive impairment (MCI), and mild Alzheimer's disease (AD).


METHODS
TUG subtasks performances were assessed by the Qualisys motion system. Cognition was assessed by Addenbrooke's Cognitive Examination and the Frontal Assessment Battery (FAB).


RESULTS
The highest correlations with transition subtasks were with aspects of executive function, i.e. the fluency domain in the PC group (n = 40), FAB scores in the MCI group (n = 40), and the visuospatial domain in the AD group (n = 38). No significant associations were found between the walking subtasks and cognition in any group. Multivariate linear regression models identified the fluency domain as an independent predictor of turn-to-walk and turn-to-sit measures in the PC group, and the visuospatial domain as an independent predictor of turn-to-walk and turn-to-sit measures in the AD group, adjusted for age and sex.


CONCLUSIONS
Poorer executive functioning was associated with impaired transition mobility in all groups. The significant associations between visuospatial impairment and poor transition mobility in the AD participants may provide insight into why this group has an elevated fall risk.
From the Postgraduate Program in Physiotherapy (JHA, LPdA, JRR) and Department of Medicine (FACV), Federal University of São Carlos, São Carlos, SP, Brazil; Centro Universitário do Norte, Manaus, AM, Brazil (THN); and Neuroscience Research Australia, University of New South Wales, Sydney, Australia (MJDC, SRL).
Juliana Hotta
JH
Ansai
Larissa Pires de
LP
Andrade
Theresa Helissa
TH
Nakagawa
Francisco Assis Carvalho
FAC
Vale
Maria Joana Duarte
MJD
Caetano
Stephen Ronald
SR
Lord
José Rubens
JR
Rebelatto
D000368:Aged; D000544:Alzheimer Disease / Q000503:physiopathology*; D003071:Cognition / Q000502:physiology*; D060825:Cognitive Dysfunction / Q000503:physiopathology*; D003430:Cross-Sectional Studies; D056344:Executive Function / Q000502:physiology; D005080:Exercise Test; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D009483:Neuropsychological Tests