Abstract
Loss of vision is well known to affect postural control in blind subjects. This effect has classically been framed in terms of deficit or compensation depending on whether body sway increases or decreases in comparison with that of sighted subjects with the eyes open. However, studies have shown that postural responses can be modulated by the context and that changes in postural sway may not necessarily mean a worsened or improved postural control. The goal of our study was to test whether balance is affected by the context in blind subjects. Additional to the quantification of center of pressure (COP) displacement, measurements of body motion (COG) and the correspondent net neuromuscular response (COP–COG) were evaluated in anterior–posterior and medial–lateral directions. Thirty-eight completely blind and thirty-two sighted subjects participated of this study. The volunteers were asked to stand barefoot on a force platform for 60 s in two different conditions: feet apart and feet together. Sighted participants performed the tests with both the eyes open and eyes closed. Results showed that the COP–COG displacements in the blind group were greater than those of the sighted group with eyes open in almost all conditions tested, but not in eyes closed condition. However, the COP and COG results confirmed that the postural responses were context dependent. Together these results suggest that total visual loss does not just lead to a balance deficit or compensation, but to a specific postural signature that might imply in enhancing COP, COG and/or COP–COG in specific postural conditions.
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Acknowledgments
The authors are indebted to the participants of this study for their agreement to the participation. This study was supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico e Tecnológico/CNPq, Fundação de Amparo a Pesquisa do Estado do Rio de Janeiro/FAPERJ and Financiadora de Estudos e Projetos/FINEP. This work is also part of the Fundação de Amparo a Pesquisa do Estado de São Paulo FAPESP’s Research, Innovation and Dissemination Center for Neuromathematics-NeuroMat.
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Russo, M.M., Lemos, T., Imbiriba, L.A. et al. Beyond deficit or compensation: new insights on postural control after long-term total visual loss. Exp Brain Res 235, 437–446 (2017). https://doi.org/10.1007/s00221-016-4799-x
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DOI: https://doi.org/10.1007/s00221-016-4799-x