Journal of Rehabilitation Research & Development (JRRD)

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Volume 50 Number 1, 2013
   Pages 85 — 98

Abstract — Interaction of poststroke voluntary effort and functional neuromuscular electrical stimulation

Nathaniel Makowski;1* Jayme Knutson, PhD;1–2 John Chae, MD;1–2 Patrick Crago, PhD1
1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH; and Cleveland Functional Electrical Stimulation Center, Cleveland, OH; 2Department of Physical Medicine and Rehabilitation, MetroHealth Medical Center, Cleveland, OH

Abstract — Functional electrical stimulation (FES) may be able to augment functional arm and hand movement after stroke. Poststroke neuroprostheses that incorporate voluntary effort and FES to produce the desired movement must consider how forces generated by voluntary effort and FES combine, even in the same muscle, in order to provide an appropriate level of stimulation to elicit the desired assistive force. The goal of this study was to determine whether the force produced by voluntary effort and FES add together independently of effort or whether the increment in force depends on the level of voluntary effort. Isometric force matching tasks were performed under different combinations of voluntary effort and FES. Participants reached a steady level of force, and while attempting to maintain a constant effort level, FES was applied to augment the force. Results indicate that the increment in force produced by FES decreases as the level of initial voluntary effort increases. Potential mechanisms causing the change in force output are proposed, but the relative contribution of each mechanism is unknown.

Key words: force, functional electrical stimulation, isometric, motor control, motor unit overlap, neuroprosthesis, reach, recruitment, stroke, triceps, upper limb.


View HTML  ¦  View PDF  ¦  Contents Vol. 50, No. 1
This article and any supplementary material should be cited as follows:
Makowski N, Knutson J, Chae J, Crago P. Interaction of poststroke voluntary effort and functional neuromuscular electrical stimulation. J Rehabil Res Dev. 2013;50(1): 85–98.
http://dx.doi.org/10.1682/JRRD.2011.04.0068
ResearcherID: Jayme Knutson, PhD: A-3607-2013
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