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Evaluation of Trunk Neuromuscular System Strategies through the Concept of Muscle Synergies

Sedaghat Nejad, Ehsan | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43179 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Parnianpour, Mohamad; Narimani, Roya; Mousavi, Javad
  7. Abstract:
  8. Low Back Pain (LBP) is an important public health problem and also a source of continuing economic concern in across the world. Many clinicians and researchers have focused on LBP due to the prevalence of it, especially in industrialized societies in recent years. Despite technological advances in diagnosis and the introduction of numerous interventions, besides increasing automation in the workplaces, the incidence of back pain in a wide range of workers in industrial environments has been reported. A better understanding of the different functions of the neuromuscular system of the spine may lead to adopt strategies to prevent LBP incidence as well as provide appropriate exercises for LBP treatment. On the other words, there is a lack of knowledge about the physiological and pathophysiological aspects of spine and trunk sensory-motor control and how they may relate to the evolution of LBP. Thus, the tools for diagnosis, intervention and treatment of this syndrome are limited. An important factor in the assessment and rehabilitation is the feedback provided to the patient on the functional condition and the performance of different tests. Providing such information during or after the treatment can increase the effectiveness of the rehabilitation process. This is especially important in patients whose sensory-motor functions are affected. The assessment of the sensory-motor functions can be efficiently performed with target matching and tracking tasks. In the target matching and tracking task a person applies the force or torque according to the visual feedback while minimizing the difference between the target and the actual response.
    In this study by analyzing the acquired torque and electromyographic data during target matching and tracking tasks in torqur-torque plane, the existence of muscle synergies and trunk controllability during isometric tasks, have been examined.Therefor the Trunk Neuromuscular Tracking System was evaluated in compatible way with Sharif Lumbar Isometric Strength Tester hardware. By utilizing this system target matching and tracking tasks in torque-torque plane in 12 direction (0°,30°,60°,…,330°) performed by 16 asymptomatic subjects. In addidtion to torque data, electromyographic data of 12 trunk muscles (6 abdominal muscles and 6 back muscles) was acquired. Results of synergy analysis showed that by taking advantage of 4 synergies, input data could be reconstructed by 95% accuracy. Each of this synergies, point to one of main directions in operating torque plane. Linear relation between activation coefficient matrix and level of exertion is the other reason for existence of muscle synergies and confiremed the convolution relation between them
  9. Keywords:
  10. Muscle Synergy ; Trunk Neuromuscular System Strategies ; Trunk Controllabitily ; Torque-Torque Plane

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