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Control of Trunk Muscle Synergies to Maintain the Equilibrium and Stability of the Spine

Eskandari Shahrabi, Amir Hossein | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42036 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Parnianpour, Mohammad; Asghari, Mohsen
  7. Abstract:
  8. Selection of muscle activation pattern to reach a specific goal by considering the complexities of neuromuscular system and the way it overcomes these complications, are of researchers’ space interest in motor control. One proposed solution for resolving these complexities is the concept of simple module (synergies) that suggests the combination of them leads to more complex activities. In the present work, the existence and arrangement of synergies in the lumbar spine have been studied. For this purpose, a model with 18- muscles at level of L4-L5 under utilized in the static condition. In order to obtain the muscular and stability synergies, a biomechanical model predicting muscle activities during 2D and 3D static exertion were used. This model required specific moment and angular joint stiffness. The results show that six muscular synergies suffice to reach any point in the moment space. Also, three stability synergies can reconstruct a part of joint angular stiffness space. In addition, the obtained muscular synergies are invariant against changes in the amplitude of exerted moment. In this study, it is shown that one can generate any task involves producing determined moment and angular stiffness in the joint by combining muscular and stability synergies together.
  9. Keywords:
  10. Lumbar ; Modeling ; Central Nervious System ; Back Muscles Stability ; Muscle Synergy

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