Effects of system nonlinearities on posture adjustments using functional neuromuscular stimulation

Eric C. Hartman, Ronald J. Triolo, James Abbas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

A real-time simulation of a musculoskeletal model has been implemented to facilitate the development of a functional neuromuscular stimulation (FNS) standing system that provides the user with the ability to make adjustments to posture. The system has been developed as a platform to investigate the effects of nonlinearities on posture adjustment capability and to explore strategies for using adaptive filters to improve system performance. The standing spinal cord injured subject is modeled as an inverted pendulum with a single degree of freedom. The simulation user operates a standard computer input device to differentially control the stimulation applied to a pair of muscles in order to balance the system model. Visual feedback is provided by a real-time display on the computer monitor. The system provides the option of simulating various muscle models ranging in complexity from instantaneous torque generators to models that include nonlinear recruitment, muscle activation dynamics, muscle activation delay, torque-angle, and torque-velocity properties. In addition, the system includes real-time nonlinear adaptive filters designed to linearize the input/output properties as seen by the user. This simulation system is currently being used in studies to develop and evaluate improved systems for FNS standing and maneuvering.

Original languageEnglish (US)
Title of host publicationAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Place of PublicationPiscataway, NJ, United States
PublisherIEEE
Pages660
Number of pages1
Volume1
ISBN (Print)0780356756
Publication statusPublished - 1999
Externally publishedYes
EventProceedings of the 1999 IEEE Engineering in Medicine and Biology 21st Annual Conference and the 1999 Fall Meeting of the Biomedical Engineering Society (1st Joint BMES / EMBS) - Atlanta, GA, USA
Duration: Oct 13 1999Oct 16 1999

Other

OtherProceedings of the 1999 IEEE Engineering in Medicine and Biology 21st Annual Conference and the 1999 Fall Meeting of the Biomedical Engineering Society (1st Joint BMES / EMBS)
CityAtlanta, GA, USA
Period10/13/9910/16/99

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ASJC Scopus subject areas

  • Bioengineering

Cite this

Hartman, E. C., Triolo, R. J., & Abbas, J. (1999). Effects of system nonlinearities on posture adjustments using functional neuromuscular stimulation. In Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings (Vol. 1, pp. 660). Piscataway, NJ, United States: IEEE.