Avaliação da ativação muscular do ombro em pessoas com lesão na extremidade distal do membro superior

Abstract

Trauma to the hand represents a relevant proportion of non-fatal injuries that require medical attention, with the potential to result in disabilities limiting function and participation. The objective of the study was to verify whether people with injuries to the distal extremity of the upper limb have greater activation of the shoulder complex muscles compared to people without injuries, when performing different isometric shoulder elevation tasks. 9 participants with a history of distal upper limb injury and 9 control participants participated in the study. The electromyographic evaluation of the upper trapezius, middle deltoid, lower trapezius and serratus anterior muscles was carried out in a condition of isometric contraction for 3 seconds, then isometric tasks of raising the arm in the scapular plane at 90º and 120º with a time of 3 seconds . Signal processing was carried out offline using Matlab® software. Student's T test was performed and participants were categorized into 4 subgroups according to the percentage of muscle activation in isometric tasks (up to 30%, between 31% and 60%, between 61% and 90% and above 90%) with the objective is to look for a pattern of activation between groups. The groups with operation and without operation were compared in relation to loaded and unloaded tasks, both in 90º and 120º of shoulder elevation amplitudes and no significant differences were found. The muscles of the shoulder complex of individuals with trauma or injury to the distal extremity do not show greater electromyographic activation than the muscles of individuals without trauma or injury.