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Development and Validation of Biomechanical Model for Calculation of Moment into the Intervertebral L5-S1 Disc and the amount of NIOSH Permissible Limit Load During Lifting Activity

Rajabtabar, Mahmood | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53413 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Parnianpor, Mohammad; Narimani, Roya
  7. Abstract:
  8. Lifting is considered a major risk to people's health in life, particularly to the workers. Appropriate wearable tools for measuring the individual’s kinematic and kinetic movement are required for examining and analyzing the lifting activity to prevent injury in the workplace. Different wearable systems have been developed to calculate the force applied on the foot sole to analyze movement in various areas of gait analysis, occupational biomechanics, sports, and other areas. The accuracy and precision of these systems need to be tested before application in any of these areas. In this study, 3 subjects performed five different activities of symmetrical lifting by placing Pedar insoles in their shoes. The required kinematics were performed by placing reflective markers on the skin using Motion analysis system. GRF was simultaneously measured by both force plate and Pedar commercial sensor systems. The L5-S1 moment value was calculated by using a 2-dimensional link-segment model and solving the torque and force equilibrium equations in bottom-up, top-down, and least-square approaches. The RMSE between the measured GRF of the Pedar and force plate systems equal 53.6N in its maximum value. The maximum RMSE 10.4Nm (NRMSE 13.3%) is calculated in the L5-S1 moment calculation by the bottom-up approach compared to the least-square approach which is considered as the gold standard. Also, the permissible load in hand is calculated for all five lifting movements. Given this RMSE value as the maximum error, the simultaneous examination of this system and the inertial wearable sensors can pave the way for future studies
  9. Keywords:
  10. Wearable Sensor ; Lifting ; Lumbosacral (L5-S1) Moment ; Kinematics Analysis ; Ground Reaction Force (GRF) ; Pedar Insole ; Intervertebral Disc ; Assessment Risk Factor in Lifting Tucks

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