Control of cyclic movements as muscles fatigue using functional neuromuscular stimulation

Jo Anne Riess, James J. Abbas

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

3 Scopus citations

Abstract

In this project, Functional Neuromuscular Stimulation (FNS) was utilized to activate the quadriceps muscle to move the lower leg in a cyclic pattern. During the 300 cycle trials (12.5 minutes), an adaptive neural network, the Pattern Generator/Pattern Shaper (PG/PS), determined the stimulation pattern. Throughout the trials, the adaptation was intermittently mined off and on so that during 3 intervals within the trial, the stimulation pattern was fixed for 50 cycles. We then investigated performance of the controller during intervals with fixed stimulation patterns and intervals with adaptation enabled. Results indicate that the adaptive controller learned to generate an appropriate stimulation pattern during the first interval with adaptation on. The performance of the fixed stimulation pattern then degraded over the next interval, presumably due to muscle fatigue. During subsequent intervals, performance improved with adaptation on and degraded with adaptation off, but the magnitude of the changes were less than during the initial intervals. These results indicate that the adaptive feature was particularly important during initial stages while most of the fatigue was occurring, but that fixed stimulation patterns may be suitable after the fatigue has plateaued.

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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    Riess, J. A., & Abbas, J. J. (1999). Control of cyclic movements as muscles fatigue using functional neuromuscular stimulation. 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.