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Dynamic stability of spine using stability-based optimization and muscle spindle reflex

Zeinali Davarani, S ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1109/TNSRE.2007.906963
  3. Publisher: 2008
  4. Abstract:
  5. A computational method for simulation of 3-D movement of the trunk under the control of 48 anatomically oriented muscle actions was developed. Neural excitation of muscles was set based on inverse dynamics approach along with the stability-based optimization. The effect of muscle spindle reflex response on the trunk movement stability was evaluated upon the application of a perturbation moment. The method was used to simulate the trunk movement from the upright standing to 60° of flexion. Incorporation of the stability condition as an additional constraint in the optimization resulted in an increase in antagonistic activities demonstrating that the antagonistic co-activation acts to increase the trunk stability in response to self-induced postural internal perturbation. In presence of a 30 Nm flexion perturbation moment, muscle spindles decreased the induced deviation of the position and velocity profiles from the desired ones. The stability-generated co-activation decreased the reflexive response of muscle spindles to the perturbation demonstrating that the rise in muscle co-activation can ameliorate the corruption of afferent neural sensory system at the expense of higher loading of the spine. © 2006 IEEE
  6. Keywords:
  7. Computer simulation ; Constraint theory ; Muscle ; Neural networks ; Optimization ; Perturbation techniques ; Prosthetics ; Muscle actions ; Perturbation moment ; Reflexive response ; Flexor reflex ; Muscle contraction ; Muscle force ; Muscle spindle afferent nerve ; Priority journal ; Simulation ; Spine stabilization ; Algorithms ; Behavior ; Feedback ; Humans ; Models, Neurological ; Movement ; Muscle Spindles ; Muscle, Skeletal ; Reflex, Stretch ; Spine ; Thorax
  8. Source: IEEE Transactions on Neural Systems and Rehabilitation Engineering ; Volume 16, Issue 1 , 2008 , Pages 106-118 ; 15344320 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/4451155