A21 Effect of lower limb and trunk posture on back load during lifting movement

Abstract

The purpose of this study was to investigate the effect on back load during lifting movement by varying lower limb and trunk posture. Seven subjects performed lifting movements with four conditions, using two foot positions (Odeg, 60deg), and two trunk postures (Neutral, Stoop). 3D kinematics and kinetics data were recorded. Significant decreases in peak right bending angle at L4/L5 and T9/T10 joint were found when subjects rotate right hip joint externally. Stoop posture decreases peak joint reaction force for pelvis longitudinal axis but increases peak left bending toque. To perform lifting movement safely, it is recommended that you rotate hip joint externally and keep trunk neutrally.