Task-dependent adjustments to co-stimulation levels in functional neuromuscular stimulation systems

Xia Zhang, Ronald J. Triolo, James J. Abbas

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

Abstract

Many Functional Neuromuscular Stimulation (FNS) systems employ the strategy of co-contracting agonist/antagonist muscle pairs in order to stabilize posture and to resist internal and external disturbances. While increasing stimulation can improve posture control, it comes at a potentially high cost of increased energy expenditure. The suitability of a given co-stimulation level will depend upon the needs of a specific task. In this work, we have developed and investigated a scheme for providing the FNS system user with the ability to adjust co-stimulation levels to meet the needs of a specific task. Musculoskeletal models were used in a series of computer simulation studies to investigate the effect of co-stimulation level on disturbance resistance capability. Based on a cost function, the optimal open-loop co-stimulation level was determined for different weights on effort and controller performance. The results indicate that providing the user with the ability to modify co-stimulation level may be an effective means of adjusting posture in a task-dependent manner.

Original languageEnglish (US)
Title of host publicationAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
PublisherIEEE
Number of pages1
ISBN (Print)0780356756
StatePublished - Dec 1 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

Publication series

NameAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Volume1
ISSN (Print)0589-1019

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

ASJC Scopus subject areas

  • Signal Processing
  • Biomedical Engineering
  • Computer Vision and Pattern Recognition
  • Health Informatics

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    Zhang, X., Triolo, R. J., & Abbas, J. J. (1999). Task-dependent adjustments to co-stimulation levels in functional neuromuscular stimulation systems. In Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings (Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings; Vol. 1). IEEE.