Trunk Stability Enabled by Noninvasive Spinal Electrical Stimulation after Spinal Cord Injury

Mrinal Rath, Albert H. Vette, Shyamsundar Ramasubramaniam, Kun Li, Joel Burdick, Victor R. Edgerton, Yury P. Gerasimenko, Dimitry G. Sayenko

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Electrical neuromodulation of spinal networks improves the control of movement of the paralyzed limbs after spinal cord injury (SCI). However, the potential of noninvasive spinal stimulation to facilitate postural trunk control during sitting in humans with SCI has not been investigated. We hypothesized that transcutaneous electrical stimulation of the lumbosacral enlargement can improve trunk posture. Eight participants with non-progressive SCI at C3-T9, American Spinal Injury Association Impairment Scale (AIS) A or C, performed different motor tasks during sitting. Electromyography of the trunk muscles, three-dimensional kinematics, and force plate data were acquired. Spinal stimulation improved trunk control during sitting in all tested individuals. Stimulation resulted in elevated activity of the erector spinae, rectus abdominis, and external obliques, contributing to improved trunk control, more natural anterior pelvic tilt and lordotic curve, and greater multi-directional seated stability. During spinal stimulation, the center of pressure (COP) displacements decreased to 1.36 ± 0.98 mm compared with 4.74 ± 5.41 mm without stimulation (p = 0.0156) in quiet sitting, and the limits of stable displacement increased by 46.92 ± 35.66% (p = 0.0156), 36.92 ± 30.48% (p = 0.0156), 54.67 ± 77.99% (p = 0.0234), and 22.70 ± 26.09% (p = 0.0391) in the forward, backward, right, and left directions, respectively. During self-initiated perturbations, the correlation between anteroposterior arm velocity and the COP displacement decreased from r = 0.5821 (p = 0.0007) without to r = 0.5115 (p = 0.0039) with stimulation, indicating improved trunk stability. These data demonstrate that the spinal networks can be modulated transcutaneously with tonic electrical spinal stimulation to physiological states sufficient to generate a more stable, erect sitting posture after chronic paralysis.

Original languageEnglish (US)
Pages (from-to)2540-2553
Number of pages14
JournalJournal of Neurotrauma
Volume35
Issue number21
DOIs
StatePublished - Nov 1 2018

Keywords

  • neuromodulation
  • paralysis
  • seated posture
  • transcutaneous electrical spinal cord stimulation
  • trunk stability and control

ASJC Scopus subject areas

  • Clinical Neurology

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