TY - GEN
T1 - Task-dependent adjustments to co-stimulation levels in functional neuromuscular stimulation systems
AU - Zhang, Xia
AU - Triolo, Ronald J.
AU - Abbas, James J.
PY - 1999
Y1 - 1999
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:0033345546
SN - 0780356756
T3 - Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
SP - 658
BT - Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
PB - IEEE
T2 - Proceedings 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)
Y2 - 13 October 1999 through 16 October 1999
ER -