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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Right cerebral hemisphere specialization for quiet and perturbed body balance control: Evidence from unilateral stroke

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Fernandes, Corina Aparecida [1] ; Coelho, Daniel Boari [1] ; Martinelli, Alessandra Rezende [1] ; Teixeira, Luis Augusto [1]
Total Authors: 4
[1] Univ Sao Paulo, Human Motor Syst Lab, Sch Phys Educ & Sport, Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: HUMAN MOVEMENT SCIENCE; v. 57, p. 374-387, FEB 2018.
Web of Science Citations: 6

Our aim in this investigation was to assess the relative importance of each cerebral hemisphere in quiet and perturbed balance, based on uni-hemispheric lesions by stroke. We tested the hypothesis of right cerebral hemisphere specialization for balance control. Groups of damage either to the right (RHD, n = 9) or the left (LHD, n = 7) cerebral hemisphere were compared across tasks requiring quiet balance or body balance recovery following a mechanical perturbation, comparing them to age-matched nondisabled individuals (controls, n = 24). They were evaluated in conditions of full and occluded vision. In Experiment 1, the groups were compared in the task of quiet standing on (A) rigid and (B) malleable surfaces, having as outcome measures center of pressure (CoP) amplitude and velocity sway. In Experiment 2, we evaluated the recovery of body balance following a perturbation inducing forward body oscillation, having as outcome measures CoP displacement, peak hip and ankle rotations and muscular activation of both legs. Results from Experiment 1 showed higher values of CoP sway velocity for RHD in comparison to LHD and controls in the anteroposterior (rigid surface) and mediolateral (malleable surface) directions, while LHD had lower balance stability than the controls only in the mediolateral direction when supported on the rigid surface. In Experiment 2 results showed that RHD led to increased values in comparison to LHD and controls for anteroposterior CoP displacement and velocity, time to CoP direction reversion, hip rotation, and magnitude of muscular activation in the paretic leg, while LHD was found to differ in comparison to controls in magnitude of muscular activation of the paretic leg and amplitude of mediolateral sway only. These results suggest that damage to the right as compared to the left cerebral hemisphere by stroke leads to poorer postural responses both in quiet and perturbed balance. That effect was not altered by manipulation of sensory information. Our findings suggest that the right cerebral hemisphere plays a more prominent role in efferent processes responsible for balance control. (AU)

FAPESP's process: 11/18173-3 - Postural responses to external perturbation in post-stroke: rehabilitation and improvement of stability by touching a vibrating surface
Grantee:Alessandra Rezende Martinelli Conterato
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 12/05769-8 - Interhemispheric asymmetries in postural control in post-stroke: quiet stance and recovering from perturbation
Grantee:Luis Augusto Teixeira
Support type: Regular Research Grants
FAPESP's process: 11/16667-9 - Interhemispheric asymmetries in postural control in post-stroke: quiet stance and recovering from perturbation
Grantee:Corina Aparecida Fernandes
Support type: Scholarships in Brazil - Master