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Biomechanical Modeling of Flexible-bar and Investigating of Muscle Forces and Compression Forces on Discs in Lumbar Region During of Rehabilitation Exercises

Abdollahi, Masoud | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47895 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Parnianpour, Mohammad; Asghari, Mohsen
  7. Abstract:
  8. A single-degree-of-freedom model is considered for flexible exercise bars based on the lumped-element approach. By considering the side segment of a flexible exercise bar as a cantilever beam with an equivalent mass at the free end, its free-vibration response and forced one under excitation of the grip of the flexible bar is written parametrically. Some experiments are performed on a specific flexible bar to obtain numerical values for the parameters in the model to have it quantitatively known. In the next step, simulation of the model results in the response of the flexible bar under a considered excitation. The response is imported into a multi-segment musculoskeletal software, AnyBody, for simulating three exercises and deriving the musculoskeletal forces. In addition, another study was conducted to investigate the influence of initial positions of the hand on the forces appear in lumbar discs and back muscles (including Longissimus, Iliocostalis, and Transversus) during up-down exercises. Different musculosketal elements forces in the three exercises were obtained and compared in this study. Also in the sensitivity analysis, the results show that all intervertebral discs and muscles forces are more sensitive to the horizontal position of the bar as compared to its vertical position
  9. Keywords:
  10. Rehabilitation ; Lumped Parameter Method ; Musculoskeletal Modeling ; Intervertebral Disc ; Biomechanical Modeling ; Intervertebral Disc Pressure

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