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Abstract
Daily life activities of humans are characterized by dual tasks, in which a manual task is performed concomitantly with a postural task. Based on the assumption that both manual and postural tasks require attentional resources, no consensus exists as to how the central nervous system modulates postural adjustments in dual tasks. The aim of the present study was to analyze the effect of a manual task requiring attentional resources on shoulder and ankle adjustments as a function of the direction and predictability of postural perturbation. The participants (n=6) were evaluated during the performance of a simple and a complex manual task, while the base of support was moved backward or forward. Latency of activation of the tibialis anterior and gastroc-nemius muscles and angular acceleration of the shoulder were analyzed. The results showed that execution of the complex manual task delayed postural adjustment. Moreover, this delay occurred differently depending on the direction of postural perturbation. The delay in postural adjustment occurred proximally in the case of anterior displacement of the platform, and distally in the case of posterior displacement. Postural adjustments were more affected by the attentional task than by the predictability of platform displacement. These results are consistent with the concept of an integrated control between manual actions and the maintenance of static posture.
Highlights
A característica automática e flexível de respostas posturais frente às exigências de estabilidade e orientação é evidenciada desde os primeiros estudos conduzidos na área de controle postural[1]
The results showed that execution of the complex manual task delayed postural adjustment
Dr José Barela, onde foram realizadas as coletas de dados deste estudo
Summary
Resumo – Diariamente, o ser humano está envolvido com tarefas duais, nas quais uma tarefa manual é realizada concomitantemente com uma tarefa postural. Este estudo objetivou analisar o efeito da execução de uma tarefa manual com exigência atencional sobre os ajustes posturais, em função da direção e previsibilidade do deslocamento da base de apoio. Kerr et al.[7] e Lajoie et al.[8], por exemplo, verificaram que o tempo de reação em uma tarefa probatória aumentava de acordo com o aumento do desafio postural (diminuição da base de suporte ou perturbação postural). Ao mesmo tempo em que haveria uma integração entre o controle postural e tarefa manual, a imprevisibilidade e a direção da perturbação postural poderiam prejudicar o desempenho da integração entre estas tarefas. O tempo para ajuste do ombro foi escolhido por estar envolvido com a manutenção do controle postural em condições de perturbação da base de suporte[13] e, no presente estudo, relacionado com o desempenho na tarefa atencional
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