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Low back disability due to manual material handling continues to be the leading cause of lost productivity for humans in the work force. While both asymmetrical lifting and repetitive lifting have been linked to an increase in the risk of low back injury, few studies have been performed biomechanically to assess if there are changes in spine mechanics with asymmetrical lifting over prolonged periods of time. Thus, the purpose of the current study was to monitor trunk muscle electromyography (EMG) and spine kinematics during repetitive asymmetrical lifting and lowering involving spine flexion, lateral bend and axial twist and to determine if there is a change in the risk of low back injury associated with fatigue. Ten male subjects were studied. Each was instrumented with a kinematic devise at the sacrum, as well as surface EMG electrode pairs to monitor the activity of the bilateral lumbar erector spinae (LES), thoracic erector spinae (TES), internal oblique (IO) and external oblique (EO) muscles. (Abstract shortened by UMI.) Source: Masters Abstracts International, Volume: 39-02, page: 0574. Adviser: Jim Potvin. Thesis (M.H.K.)--University of Windsor (Canada), 2000.
Fraser, Derek Fredrick., "Fatigue response of the spine to asymmetrical lifting and lowering." (2000). Electronic Theses and Dissertations. 2084.