TY - GEN
T1 - Tracking control of a human limb during asynchronous neuromuscular electrical stimulation
AU - Downey, Ryan J.
AU - Cheng, Teng-Hu
AU - Dixon, Warren E.
PY - 2013/1/1
Y1 - 2013/1/1
N2 - Neuromuscular electrical stimulation (NMES) is defined as the use of an electrical stimulus to elicit muscle contractions and is commonly used in rehabilitative settings. NMES is also used for assistive purposes to create functional movements where it is termed functional electrical stimulation (FES). One limitation of NMES/FES is early onset of fatigue due to the nonselective, spatially fixed, synchronous activation of motor units. Asynchronous stimulation can reduce NMESinduced fatigue; however, one limitation of asynchronous stimulation is that switching between stimulation channels may introduce discontinuities due to a differing response to stimulation by each group of recruited motor units. Thus, there is a need to design a controller which considers the switching dynamics and muscle response to stimulation during asynchronous stimulation. A closed-loop feedback controller is developed in this paper to yield semi-global asymptotic tracking of a desired trajectory for a person's knee-shank complex during asynchronous stimulation. The result is promising for the implementation of asynchronous stimulation in assistive devices as a method to reduce fatigue while tracking a desired trajectory.
AB - Neuromuscular electrical stimulation (NMES) is defined as the use of an electrical stimulus to elicit muscle contractions and is commonly used in rehabilitative settings. NMES is also used for assistive purposes to create functional movements where it is termed functional electrical stimulation (FES). One limitation of NMES/FES is early onset of fatigue due to the nonselective, spatially fixed, synchronous activation of motor units. Asynchronous stimulation can reduce NMESinduced fatigue; however, one limitation of asynchronous stimulation is that switching between stimulation channels may introduce discontinuities due to a differing response to stimulation by each group of recruited motor units. Thus, there is a need to design a controller which considers the switching dynamics and muscle response to stimulation during asynchronous stimulation. A closed-loop feedback controller is developed in this paper to yield semi-global asymptotic tracking of a desired trajectory for a person's knee-shank complex during asynchronous stimulation. The result is promising for the implementation of asynchronous stimulation in assistive devices as a method to reduce fatigue while tracking a desired trajectory.
UR - http://www.scopus.com/inward/record.url?scp=84902337795&partnerID=8YFLogxK
U2 - 10.1109/CDC.2013.6759872
DO - 10.1109/CDC.2013.6759872
M3 - Conference contribution
AN - SCOPUS:84902337795
SN - 9781467357173
T3 - Proceedings of the IEEE Conference on Decision and Control
SP - 139
EP - 144
BT - 2013 IEEE 52nd Annual Conference on Decision and Control, CDC 2013
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 52nd IEEE Conference on Decision and Control, CDC 2013
Y2 - 10 December 2013 through 13 December 2013
ER -