Ordem de recrutamento muscular em movimentos de reversão do braço em diferentes regiões espaciais
DOI:
https://doi.org/10.33233/fb.v2i1.622Abstract
Neste estudo testamos regras freqüentemente utilizadas para descrever a seqüência em que o Sistema Nervoso ativa a musculatura. Em particular, testamos a existência das seqüências proximal-distal e agonista-antagonista durante a execução de movimentos complexos. Para tanto, oito indivíduos realizaram movimentos planares de reversão em nove alvos colocados em três orientações espaciais diferentes. Para cada um destes movimentos, foram reconstruídos os deslocamentos angulares do ombro e do cotovelo e o deslocamento linear do dedo indicador. Simultaneamente foi registrada a atividade eletromiográfica dos músculos: bíceps braquial, tríceps cabeça lateral, deltóide anterior e deltóide posterior. Foi demonstrado que esses músculos não foram ativados em uma seqüência proximal-distal e que esta seqüência variou com a orientação espacial. Para uma das orientações espaciais, houve também uma reversão na seqüência agonista-antagonista na qual os músculos do cotovelo foram ativados. Os resultados são discutidos em termos da demanda mecânica das tarefas.
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