Journal of Rehabilitation Research & Development (JRRD)

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Center of mass acceleration feedback control for standing by functional neuromuscular stimulation: A simulation study

Raviraj Nataraj, et al.


Figure 3. Compass diagrams displaying theoretical "net activation directions" for various muscle groups. Net activation direction suggests muscle group is most active when system center of mass is being accelerated in that direction as result of all muscles activating to directly counter (i.e., oppose) disturbance from neutral standing. Activation direction (0) results displayed for respective nondisabled model (solid arrow) and electromyo-graphic (broken arrow) data for following right-side (RT) muscle groups: soleus (SOL, 0 = 183??, 153?? ?? 13??), tibialis anterior (TA, 0 = 40??, 35?? ?? 11??), vastus intermedius (VAST, 0 = 181??, 46?? ?? 13??), semimembranosus (SEM, 0 = 286??, 222?? ?? 12??), adductor magnus (ADD, 0 = 234??, 207?? ?? 13??), gluteus maximus (GMAX, 0 = 164??, 319?? ?? 17??), gluteus medius (GMED, 0 = 130??,114?? ?? 19??), erector spinae (ES, 0 = 75??, 41?? ?? 12??).

Over 25% of individuals with spinal cord injury (SCI) are veterans, and functional neuromuscular stimulation (FNS) has been proven effective in restoring basic mobility following paralysis. This article investigates a novel feedback controller for improving balance function following SCI using an implantable FNS standing system. The controller was developed and tested using a computer model of the human legs and trunk. Inclusion of feedback control improved balance function by 43% in the model. Future work will concentrate on customizing this control system for specific users and testing under live laboratory conditions.

Volume 49 Number 2, 2012
   Pages 279 — 296

View HTML  ¦  View PDF  ¦  Contents Vol. 49, No. 2
This article and all supplementary material should be cited as follows:
Nataraj R, Audu ML, Kirsch RF, Triolo RJ. Center of mass acceleration feedback control for standing by functional neuromuscular stimulation: A simulation study. J Rehabil Res Dev. 2012;49(2):279–96.
http://dx.doi.org/10.1682/JRRD.2010.12.0235
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Last Reviewed or Updated  Wednesday, April 4, 2012 12:02 PM

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