raviraj nataraj; musa l. audu, phd; ronald j. triolo, phd
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Center of mass acceleration feedback control of functional neuromuscular stimulation for standing in presence of internal postural perturbations. Raviraj Nataraj; Musa L. Audu, PhD; Ronald J. Triolo, PhD. Aim - PowerPoint PPT PresentationTRANSCRIPT
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This article and any supplementary material should be cited as follows: Nataraj R, Audu ML, Triolo RJ. Center of mass acceleration feedback control of functional neuromuscular stimulation for standing in presence of internal postural perturbations. J Rehabil Res Dev. 2012;49(6):889–912. http://dx.doi.org/10.1682/JRRD.2011.07.0127
Slideshow ProjectDOI:10.1682/JRRD.2011.07.0127JSP
Center of mass acceleration feedback control of functional neuromuscular stimulation for
standing in presence of internal postural perturbations
Raviraj Nataraj; Musa L. Audu, PhD; Ronald J. Triolo, PhD
![Page 2: Raviraj Nataraj; Musa L. Audu, PhD; Ronald J. Triolo, PhD](https://reader036.vdocuments.mx/reader036/viewer/2022062519/56814f29550346895dbcb505/html5/thumbnails/2.jpg)
This article and any supplementary material should be cited as follows: Nataraj R, Audu ML, Triolo RJ. Center of mass acceleration feedback control of functional neuromuscular stimulation for standing in presence of internal postural perturbations. J Rehabil Res Dev. 2012;49(6):889–912. http://dx.doi.org/10.1682/JRRD.2011.07.0127
Slideshow ProjectDOI:10.1682/JRRD.2011.07.0127JSP
• Aim– Evaluate center of mass (COM) acceleration feedback
control of neuroprosthesis with functional neuromuscular stimulation (FNS) to restore standing balance to subject with spinal cord injury.
• Relevance– Neuroprosthesis users maintain balance by postural
corrections with upper-limb (UL) loads on assistive device or support surface (e.g., walker, countertop).
• This can compromise utility of standing with FNS by limiting functional use of hands and arms.
![Page 3: Raviraj Nataraj; Musa L. Audu, PhD; Ronald J. Triolo, PhD](https://reader036.vdocuments.mx/reader036/viewer/2022062519/56814f29550346895dbcb505/html5/thumbnails/3.jpg)
This article and any supplementary material should be cited as follows: Nataraj R, Audu ML, Triolo RJ. Center of mass acceleration feedback control of functional neuromuscular stimulation for standing in presence of internal postural perturbations. J Rehabil Res Dev. 2012;49(6):889–912. http://dx.doi.org/10.1682/JRRD.2011.07.0127
Slideshow ProjectDOI:10.1682/JRRD.2011.07.0127JSP
Methods• Created artificial neural network to map gain-
modulated changes in total body COM acceleration estimated from body-mounted sensors to optimal changes in stimulation required to maintain standing.
• Systematically tuned feedback gains to minimize UL loads applied by subject to instrumented support device during internally generated postural perturbations produced by volitional reaching and object manipulation.
![Page 4: Raviraj Nataraj; Musa L. Audu, PhD; Ronald J. Triolo, PhD](https://reader036.vdocuments.mx/reader036/viewer/2022062519/56814f29550346895dbcb505/html5/thumbnails/4.jpg)
This article and any supplementary material should be cited as follows: Nataraj R, Audu ML, Triolo RJ. Center of mass acceleration feedback control of functional neuromuscular stimulation for standing in presence of internal postural perturbations. J Rehabil Res Dev. 2012;49(6):889–912. http://dx.doi.org/10.1682/JRRD.2011.07.0127
Slideshow ProjectDOI:10.1682/JRRD.2011.07.0127JSP
Subject with spinal cord injury undergoing internal perturbations by volitionally moving object over level surface with one arm while stabilizing with other arm.
![Page 5: Raviraj Nataraj; Musa L. Audu, PhD; Ronald J. Triolo, PhD](https://reader036.vdocuments.mx/reader036/viewer/2022062519/56814f29550346895dbcb505/html5/thumbnails/5.jpg)
This article and any supplementary material should be cited as follows: Nataraj R, Audu ML, Triolo RJ. Center of mass acceleration feedback control of functional neuromuscular stimulation for standing in presence of internal postural perturbations. J Rehabil Res Dev. 2012;49(6):889–912. http://dx.doi.org/10.1682/JRRD.2011.07.0127
Slideshow ProjectDOI:10.1682/JRRD.2011.07.0127JSP
Results• Total body COM acceleration was accurately
estimated (>90% variance explained) from 3-D accelerometers mounted on pelvis and torso.
• Compared with clinical constant muscle stimulation, COM acceleration feedback control of stimulation improved standing performance by reducing UL loading required to resist internal postural disturbances by 27%.
![Page 6: Raviraj Nataraj; Musa L. Audu, PhD; Ronald J. Triolo, PhD](https://reader036.vdocuments.mx/reader036/viewer/2022062519/56814f29550346895dbcb505/html5/thumbnails/6.jpg)
This article and any supplementary material should be cited as follows: Nataraj R, Audu ML, Triolo RJ. Center of mass acceleration feedback control of functional neuromuscular stimulation for standing in presence of internal postural perturbations. J Rehabil Res Dev. 2012;49(6):889–912. http://dx.doi.org/10.1682/JRRD.2011.07.0127
Slideshow ProjectDOI:10.1682/JRRD.2011.07.0127JSP
Conclusions• This case study suggests that COM acceleration
feedback could be advantageous in standing neuroprosthesis.– Can be implemented with only a few feedback
parameters.– Requires minimal instrumentation for
comprehensive 3-D control of dynamic standing function.