Análise da rotação ombro-quadril e co-contração muscular do tronco durante um movimento de rotação axial com manuseio de carga

• Autor(a) principal: Monteiro, João André Bernini [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/131866; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/26-10-2015/000851968.pdf
• topic: Biomecânica; Engenharia humana; Coluna lombar; Doenças profissionais; Biomechanics

Back pain affect 80% of the general population. The manual occupational lifting are widely related to lumbar disorders as well as axial rotation of the trunk. The axial rotation of the trunk alone is the cause of 33% of all spinal injuries, a fact that needs to be better understood, especially when it is performed together with the manual loading. The aim of this study was to analyze the activity of the erector and abdominal muscles, the load-carrying task agonists with asymmetry, and the relationship between the rotation of the shoulder and hip during axial rotation. Nine male volunteers (age: 22.4 ± 1.06 years; BMI: 20.79 ± 2.23 kg / m²;% fat: 9 ± 3.84%), without low back pain participated in the survey performing the motion of the axial rotation of the trunk with loading a box in four different conditions by varying the loaded weight and speed of execution during the task. We used surface electromyography (EMG) to capture the signs of the ipsilateral internal oblique muscle, contralateral external oblique and lumbar erector spine right and left and 2D kinematics for the analysis of trunk behavior along the axial rotation of the trunk with manual loading. The statistical treatment of the data obtained, the simple variance test, one-way ANOVA was selected for the comparisons (p <0.05). The results of the electromyography showed a different muscle pattern only for the angle of 90 ° axial rotation, especially in relation to medium-lateral muscle activation (p = 0.001), co-activation middle-right side (p = 0.004), activity individual muscle of the contralateral erector muscle (p = 0.001) and contralateral external oblique muscle (p = 0.01). The findings of the kinematics suggest that 90 ° of rotation is the most injury potential position since we found a larger difference between the hip and shoulder rotation to this reference point (p = 0.001) ... (Complete abstract click electronic access below)