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Cognitive motor interference during dual-task gait in essential tremor

RAO AK; UDDIN J; GILLMAN MA; LOUIS ED
GAIT POSTURE , 2013, vol. 38, n° 3, p. 403-409
Doc n°: 169523
Localisation : Documentation IRR

D.O.I. : http://dx.doi.org/DOI:10.1016/j.gaitpost.2013.01.006
Descripteurs : AD33 - MOUVEMENTS ANORMAUX, DF23 - PATHOLOGIE - MARCHE

Functional ambulation requires concurrent performance of motor and
cognitive tasks, which may create interference (degraded performance) in either
or both tasks. People with essential tremor (ET) demonstrate impairments in gait
and cognitive function. In this study we examined the extent of interference
between gait and cognition in people with ET and controls during dual-task gait.
METHODS: We tested 62 controls and 151 ET participants (age range: 72-102). ET
participants were divided into two groups based on median score on the modified
Mini Mental State Examination. Participants walked at their preferred speed, and
performed a verbal fluency task while walking. We analyzed gait velocity,
cadence, stride length, double support time, stride time, step width, step time
difference, coefficient of variation (CV) of stride time and stride length.
RESULTS: Verbal fluency performance during gait was similar across groups
(p=0.68). Velocity, cadence and stride length were lowest whereas step time
difference (p=0.003), double support time (p=0.009), stride time (p=0.002) and
stride time CV (p=0.007) were highest for ET participants with lower cognitive
scores (ETp-LCS), compared with ET participants with higher cognitive scores
(ETp-HCS) and controls. ETp-LCS demonstrated greatest interference for double
support time (p=0.005), step time difference (p=0.013) and stride time
coefficient of variation (p=0.03). CONCLUSIONS: ETp-LCS demonstrated high levels
of cognitive motor interference. Gait impairments during complex tasks may
increase risk for falls for this subgroup and underscore the importance of
clinical assessment of gait under simple and dual-task conditions.
CI - Copyright (c) 2013 Elsevier B.V. All rights reserved.

Langue : ANGLAIS

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