Center of mass acceleration feedback control of standing balance by functional neuromuscular stimulation against external postural perturbations

Raviraj Nataraj, Musa L. Audu, Ronald J. Triolo

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

This study investigated the use of center of mass (COM) acceleration feedback for improving performance of a functional neuromuscular stimulation control system to restore standing function to a subject with complete, thoracic-level spinal cord injury. The approach for linearly relating changes in muscle stimulation to changes in COM acceleration was verified experimentally and subsequently produced data to create an input-output map driven by sensor feedback. The feedback gains were systematically tuned to reduce upper extremity (UE) loads applied to an instrumented support device while resisting external postural disturbances. Total body COM acceleration was accurately estimated (>89% variance explained) using 3-D outputs of two accelerometers mounted on the pelvis and torso. Compared to constant muscle stimulation employed clinically, feedback control of stimulation reduced UE loading by 33%. COM acceleration feedback is advantageous in constructing a standing neuroprosthesis since it provides the basis for a comprehensive control synergy about a global, dynamic variable and requires minimal instrumentation. Future work should include tuning and testing the feedback control system during functional reaching activity that is more indicative of activities of daily living.

Original languageEnglish
Article number6301683
Pages (from-to)10-19
Number of pages10
JournalIEEE Transactions on Biomedical Engineering
Volume60
Issue number1
DOIs
StatePublished - 2013

Keywords

  • Functional neuromuscular stimulation (FNS)
  • rehabilitation
  • spinal cord injury (SCI)
  • standing balance

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