Abstract
There has been no previous study investigating the triaxial strength potentials of the trunk muscles in a pre-rotated spine. A great many lifting tasks in construction industry occur while the trunk has already been flexed in the sagittal plane. The purpose of this study was (a) to measure the triaxial maximum isometric strength of normal male subjects in all six possible directions while standing in three different postures: 0, 20, and 36 degrees of trunk flexion; (b) to assess the effect of posture on the maximum isometric torque in all six directions. The highest maximum isometric extension and flexion torques were recorded at 36 degrees of trunk flexion - they increased by 68% and 36% with respect to upright posture. The flexion angle significantly affected the measured torques in the intended plane of exertion during attempted flexion and extension, while the torques in the accessory planes were affected in the attempted right and left lateral bending and axial rotation ( p<0.05).
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