Integração do controle postural e de ações manuais em função da previsibilidade de perturbação e da demanda de precisão espacial / Integration between postural control and manual tasks as a function of predictability of perturbation and spatial precision demand

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The aim of this study was to analyze postural control as a function of predictability of a load lifted with the hands, and demand of spatial accuracy in the task. Fifteen males (mean age: 22.8 3.5 years) lifted boxes with variable masses (1, 3 and 5 kg), in conditions of predictable or unpredictable load. The task was performed either under lower spatial accuracy demand or aiming at a spatial target. Displacement of center of pressure (CP) and kinematics of the main joints/box motion were analyzed to access postural perturbation induced by the lifting task. Results showed that unpredictability about mass of the box enhanced CP displacement. Enhanced CP displacement was also observed in situations of decreased mass regarding the previous trial, even when participants were aware about the change. The pointing task induced decreased (a) CP displacement, (b) box lifting velocity, and (c) ankle and hip motion amplitude. These results indicate that predictability about external forces acting on the body, spatial demand of manual tasks, and movement organization/feedback of the previous trial interact to affect postural control

ASSUNTO(S)

predictability postural control precisão espacial elevação de carga load lifting controle postural spatial accuracy previsibilidade

ACESSO AO ARTIGO

Documentos Relacionados