Objectives and thesis organization -- Model and In Vivo studies on human trunk load partitioning and stability in isométric forward flexions -- Biomechanics of changes in lumbar posture in static lifting -- Sensitivity of kinematics-based model predictions to optimization criteria in static lifting tasks -- Role of intra-abdominal pressure in unloading and stabilization of the human spine during static lifting tasks -- Wrapping of trunk thoracic extensor muscles influences muscle forces and spinal loads lifting tasks -- Trunk biomechanical models based on equilibrium at a single-level violate equilibrium at other levels
