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Compensatory postural adjustments in na oculus virtual reality environment and the risk of falling in Alzheimer’s disease

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Resumo:Background/Aims Alzheimer's disease (AD) patients have an impaired ability to quickly reweight central sensory dependence in response to unexpected body perturbations. Herein, we aim to study provoked compensatory postural adjustments (CPAs) in a conflicting sensory paradigm with unpredictable visual displacements using virtual reality goggles. Methods We used kinematic time-frequency analyses of two frequency bands: a low-frequency band (LB; 0.3-1.5 Hz; mechanical strategy) and a high-frequency band (HB; 1.5-3.5 Hz; cognitive strategy). We enrolled 19 healthy subjects (controls) and 21 AD patients, divided according to their previous history of falls. Results The AD faller group presented higher-power LB CPAs, reflecting their worse inherent postural stability. The AD patients had a time lag in their HB CPA reaction. Conclusion The slower reaction by CPA in AD may be a reflection of different cognitive resources including body schema self-perception, visual motion, depth perception, or a different state of fear and/or anxiety.
Autores principais:Gago, Miguel F.
Outros Autores:Yelshyna, Darya; Bicho, Estela; Silva, Hélder; Rocha, Luís Alexandre Machado; Rodrigues, Maria Lurdes; Sousa, Nuno
Assunto:Alzheimer’s disease Falls Compensatory postural adjustments Oculus virtual reality Time-frequency distribution Inertia measurement units
Ano:2016
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso aberto
Instituição associada:Universidade do Minho
Idioma:inglês
Origem:RepositóriUM - Universidade do Minho

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