Avaliação da irradiação durante contração isométrica voluntária máxima de músculos extensores de punho utilizando ou não a caixa do espelho

Abstract

Aiming to explore more about the contralateral muscle activation (irradiation) in the upper limb, during unilateral activity, were prepared two articles. For both, we evaluated 42 subjects, 13 right-handed women (MD) and 11 right-handed men (HD), 10 women sinister (MS) and 8 men claims (HS) with mean age of 26.72 (± 7.41) years. These subjects performed unilateral MVIC through traction by a load cell with electrodes positioned to record the electromyographic activity of the radial carpal extensor muscles (RCE) and ulnar carpal Extensor (UCE) and contralateral muscle activation was evaluated. In the first, the aim was to evaluate the immediate contralateral irradiation during maximal voluntary isometric contraction (MVIC) of the extensor muscles of the wrist, by surface electromyography and verify the effect of dominance in this irradiation. No difference was found in the contralateral irradiation between task with the dominant hand or not dominant. The EUC muscle were higher in irradiation. It was found in this study the presence of irradiation effect on extensor muscles of the wrist and there was no influence of the use of the dominant hand or not dominant hand in the contralateral irradiation. We conclude that the dominance is irrelevant to the occurrence of contralateral irradiation. The second study study aimed to evaluate the mirror technique of influence on the contralateral electromyographic activity during maximum voluntary isometric contraction (MVIC) of wrist extensors, check the difference of this response in relation to gender and dominance. The use of mirror did not lead to influence the contralateral muscle activation during MVIC. When you break apart into four groups, the mirror resulted in a subtle positive influence on irradiation to RW, RM and SW and negative for SM. We conclude that, for a single application of the mirror box associated with MVIC wrist extensors was not observed contralateral influence in the EMG activation. Research involving applications of this technique for a long-term are necessary for evaluating the effectiveness of technical and higher reproducibility. These results can guide the treatment of individuals harmed by the irradiation resource.