A study to use transcutaneous spinal cord stimulation to characterize sensorimotor deficits in a pediatric population of individuals with spina bifida.
The study's goals involve understanding how transcutaneous stimulation affects motor deficits across three dimensions; weakness, coordination, and spasticity. This will be investigated by an electrophysiological characterization lower-extremity deficits, using TS to interrogate neuromotor topography and connectivity of the spinal cord to specific muscles. These evaluations will enable a unique patient-specific understanding of the electrophysiological mechanisms underlying motor deficits. Furthermore, these evaluations will assess the therapeutic potential of a novel closed-loop TS plasticity induction protocol to strengthen weakened muscles in a pediatric SB population.
Study Type
INTERVENTIONAL
Allocation
NON_RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Enrollment
30
DS8R (Digitimer LLC) for transcutaneous neurostimulation.
Mayo Clinic in Rochester
Rochester, Minnesota, United States
RECRUITINGManual muscle testing (MMT)
Measuring muscle strength and function using the Daniels and Worthingham's Muscle Grading Scale. A physical therapist will use a 5-point scale to manually test the 5 lower extremity muscles on each side, with 0 being no visible or palpable contraction, up to 5 being full range of motion against gravity with maximal resistance. The maximum total score would be 50.
Time frame: 1 to 12 visits (up to 6 weeks)
Spasticity (1)
Change in measurement of leg muscle tone utilizing the Modified Ashworth Scale (MAS). A physical therapist will use a 5-point scale to assess resistance of major muscles during passive range of motion, with a lower score for a muscle indicating less tone. MAS for 4 muscle groups in each leg will be reported.
Time frame: 1 to 12 visits (up to 6 weeks)
Spasticity (2)
Change in measurements of leg muscle tone utilizing Wartenberg's pendulum test, with the first swing angle (FSA) degrees as the primary outcome. Fewer degrees on swing angle indicating greater spasticity.
Time frame: 1 to 12 visits (up to 6 weeks)
Gait
Gait speed will be quantified in m/sec utilizing a motion capture system, with faster gait speed indicating less impairment.
Time frame: 1 to 12 visits (up to 6 weeks)
Coordination
Coordination will be reported with the Selective Control Assessment of the Lower Extremity (SCALE) total limb score for both right and left leg. Total score for each limb is 10, with a higher score indicating coordination closer to optimal.
Time frame: 1 to 12 visits (up to 6 weeks)
Electromyography (EMG)
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TS-evoked motor potential (MEP) amplitude, in millivolts, will be reported for major lower limbs muscles. An increase in MEP amplitude is indicative of greater muscle activation, closer to optimal function.
Time frame: 1 to 12 visits (up to 6 weeks)