Computer Simulation of the Effects of Muscle Co-activation and Joint Stiffness on Postural Stability

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Date
2016-06-09Author
Shabani, Mohammad 1990-
ORCID
0000-0003-3541-6076Type
ThesisDegree Level
MastersMetadata
Show full item recordAbstract
Postural stability is affected by several biomechanical factors including posture, foot placement, intrinsic muscle stiffness, and joint stiffness due to muscle co-activation. Increasing natural postural stability could make balance control easier for individuals with diminished postural responses. However, it is not clear which biomechanical factors most significantly contribute to the natural postural stability. The objective of this thesis is to simulate the effect of intrinsic muscle stiffness and muscle co-activation on the postural stability using a musculoskeletal computer model subjected to support-platform perturbations. We developed a customized static-optimization method to encourage co-activation using joint stiffness as an intermediate variable to improve postural stability. To this end, we also implemented a short-range stiffness muscle model and compared its stabilizing effects to a standard Hill-type muscle model. Our result showed that co-activation of muscles resulted in higher joint stiffness and higher postural stability and that intrinsic muscle short-range stiffness contributed significantly to postural stability.
Degree
Master of Science (M.Sc.)Department
Computer ScienceProgram
Computer ScienceSupervisor
Stavness, IanCommittee
Gutwin, Carl; Keil, Mark; Zhang, ChrisCopyright Date
May 2016Subject
Postural stability
Musculoskeletal simulation
Co-activation
Static Optimization
Short-range stiffness
Hill-type muscle model