Spinal Cord Injuries, Stroke
Conditions
Brief summary
Transcutaneous electrical stimulation (tcES) of the spinal cord has shown great promise in restoring upper extremity function after spinal cord injury (SCI). More recently, the use of invasive, epidural electrical stimulation of the spinal cord has also demonstrated promise in restoring upper extremity function post-stroke. However, the effect of stimulation parameters such as electrode configuration and stimulation frequency on excitability of the nervous system remains unknown preventing the opportunity to fully exploit this noninvasive stimulation paradigm. Additionally, the utility of noninvasive tcES in the stroke population remains unexplored. This project utilizes a comprehensive set of neurophysiological techniques, in combination with carefully chosen motor tasks, to directly link and assess the effects of stimulation parameters on neural excitability and upper extremity function during and following the delivery of cervical tcES in individuals with SCI and stroke. The fundamental knowledge gained from this project will ultimately improve the implementation of this novel and non-invasive neuromodulatory tool through an improved understanding of how tcES can facilitate recovery of function.
Detailed description
In the first two aims of this study we explore the effects of stimulation configurations on neural excitability. Specifically we will explore the effects of electrode placement and stimulation frequency on measures of corticospinal and intracortical excitability. In the last aim of this study, individuals will participate in an interventional trial combining activity-based therapy with tcES. We will explore whether this intervention facilitated improvements in upper extremity function through clinical and neurophysiological assessments.
Interventions
DEVICETranscutaneous spinal cord stimulation
Continuous, sub motor threshold stimulation is delivered through surface electrodes placed over the cervical spine region.
Using the ReJoyce system individuals will engage in upper extremity rehabilitation.
Sponsors
University of Alberta
Glenrose Foundation
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
BASIC_SCIENCE
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 75 Years
Healthy volunteers
No
Inclusion criteria
SCI cohort: * individuals aged 18 to 75 years of age who have suffered a spinal cord injury * cervical level injury (C3 to C8) * at least 1-year post-injury * for individuals taking medications for spasmolysis or muscle relaxation (e.g. oral baclofen, tizanidine, dantrolene, vigabatrin, gabapentin, or benzodiazepine), dose and regimen must be stable for at least 4 weeks prior to screening Stroke cohort: * individuals aged 18-75 years of age who have suffered any type of stroke resulting in upper extremity motor dysfunction with partially preserved motor function * ≥ 6 months post-stroke * At least 4 months since last BoNT injection for treatment of spasticity or any other condition or ≤ 2 months after study completion * for individuals taking medications for spasmolysis or muscle relaxation (e.g. oral baclofen, tizanidine, dantrolene, vigabatrin, gabapentin, or benzodiazepine), dose and regimen must be stable for at least 4 weeks prior to screening
Exclusion criteria
* pregnant women * aphasia or dysphasia * spasticity grade Modified Ashworth Scale ≥ 3 Transcranial magnetic stimulation-specific
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Spinal Excitability | Baseline, End of Intervention (2mths), 6-month follow-up (8mths) | Changes in spinal excitability measured by stimulating the cervical spinal cord while recording muscle signals from upper extremity muscles will be assessed at the beginning and end of the interventional arm, and then 6 months following completion of the intervention. |
| Corticospinal excitability | Baseline, End of Intervention (2mths) and at 6-month follow-up timepoint (8mths) | Changes in corticospinal excitability (using transcranial magnetic stimulation) will be assessed at the beginning and end of the interventional arm, and then 6 months following completion of the intervention. |
| Clinical assessment of UE function | Baseline, End of Intervention (2mths), and 6-month Follow-up (8mths). | For SCI participants, the GRASSP assessment will be utilized to assess changes in upper extremity strength, sensation and function. In the stroke population, the ARAT, Fugl-Meyer tests will be utilized. In both patient groups, the arm and hand function test performed by the ReJoyce system will also be utilized. |
| Changes in Intracortical Excitability | Baseline, End of Intervention (2mths) and at 6-month follow-up timepoint (8mths) | Changes in intracortical excitability utilizing paired-pulse transcranial magnetic stimulation protocols will be explored at baseline, end of the intervention period, and 6months following completion of the trial. |
Countries
Canada
Contacts
CONTACTJessica D'Amico, PhD
PRINCIPAL_INVESTIGATORJessica D'Amico, PhD
University of Alberta
Outcome results
None listed