Back to Search
Start Over
Right cerebral hemisphere specialization for quiet and perturbed body balance control: evidence from unilateral stroke
- Source :
- Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP
- Publication Year :
- 2018
-
Abstract
- 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.
- Subjects :
- Male
medicine.medical_specialty
Rotation
Right cerebral hemisphere
Posture
Biophysics
Experimental and Cognitive Psychology
Sensory system
050105 experimental psychology
03 medical and health sciences
0302 clinical medicine
Physical medicine and rehabilitation
ACIDENTE VASCULAR CEREBRAL
Center of pressure (terrestrial locomotion)
medicine
Pressure
Humans
0501 psychology and cognitive sciences
Orthopedics and Sports Medicine
Cerebrum
Postural Balance
Vision, Ocular
Aged
Aged, 80 and over
Hip
Body balance
05 social sciences
Outcome measures
General Medicine
Middle Aged
Healthy Volunteers
Surgery
Biomechanical Phenomena
Stroke
medicine.anatomical_structure
QUIET
Cerebral hemisphere
Female
Stress, Mechanical
Ankle
Psychology
030217 neurology & neurosurgery
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP
- Accession number :
- edsair.doi.dedup.....4b31e4b8ba1c4610f01e23fbdf81612c