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Biomechanical Evaluation of the Niosh Equation in Stoop Versus Squat Load-Handling Activities Using a Full-Body Musculoskeletal Model

Dehghan, Parisa | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54036 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Arjmand, Navid
  7. Abstract:
  8. Objective: To assess adequacy of the National Institute for Occupational Safety and Health (NIOSH) Lifting Equation (NLE) in controlling lumbar spine loads below their recommended action limits during load-handling activities in the stoop and squat using a detailed musculoskeletal model,that is, the AnyBody Modeling System.Background: The NIOSH committee employed simplistic biomechanical models for the calculation of the spine compressive loads with no estimates of the shear loads. In addition, NLE does not include the posture of the knee during manual material handling. It is therefore unknown whether the NLE would adequately control lumbar compression and shear loads below their recommended action limits during different postures of the knee ( Stoop and Squat) in load-handling activities.Method: Twenty-four static stoop and squat lifting tasks at different load asymmetry angles, heights, and horizontal distances were performed by four normal-weight (70 kg) individuals. For each task, the recommended weight limit computed by the NLE and the coordinates on bony landmarks on the body segment measured by a video-camera system (VICON) were prescribed in the participant-specific models developed in the AnyBody Modeling System that estimated spinal loads.Results: For all the individuals, the NLE adequately controlled L5-S1 loads below their recommended action limits for all activities performed in both postures (Stoop and Squat). However, the results show a significant difference between stoop and squat lifting technics (p<0.05). Conclusion: The NLE succeeded in controlling spinal loads below the recommended limits during asymmetric lifting tasks with both stoop and squat technics for people about 70 KG. As an individual's weight can affect L5-S1 loads, it is recommended to do the same present project with obese individuals
  9. Keywords:
  10. Force ; Kinematics ; Spine ; Compressive Force ; Shear Force ; Manual Material Handeling ; Biomechanical Models ; Kinetics Modeling ; National Institute for Occupational Safety and Health (NIOSH) Equation ; Stoop Posture ; Squat Posture

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