Grasping Function After Spinal Cord Injury
Overview
- Phase
- Not Applicable
- Intervention
- Sham iTMS
- Conditions
- Spinal Cord Injury
- Sponsor
- VA Office of Research and Development
- Enrollment
- 50
- Locations
- 1
- Primary Endpoint
- Changes in amplitude of Motor evoked potential size
- Status
- Terminated
- Last Updated
- 3 months ago
Overview
Brief Summary
The overall goals of this proposal are to examine the contribution of physiological pathways to the control of grasping behaviors after cervical SCI, and to maximize the recovery of grasping by using tailored non-invasive brain stimulation and acoustic startle protocols with motor training. The investigators propose to study two basic grasping behaviors, which are largely used in most daily-life activities: a precision grip and a power grip.
Detailed Description
Grasping behaviors, which are essential for daily-life functions, are largely impaired in individuals with cervical spinal cord injury (SCI). Although rehabilitative interventions have shown success in improving the ability to grasp following injury their overall effects remain limited. The goals of this proposal are to examine the contribution of physiological pathways to the control of grasping behaviors after cervical SCI, and to maximize the recovery of grasping by using tailored non-invasive stimulation protocols with motor training. The investigators propose to study two basic grasping behaviors: a precision grip and a power grip. These behaviors are crucial because they provide the basis for a number human prehensile manipulations and are also necessary skills for eating, writing, dressing, and many other functions. Thus, the study results may have a direct impact on the quality of life for Veterans and their caregivers by enhancing their independence and level of care. In Aim 1, the investigators will investigate the contribution of corticospinal and brainstem pathways to the control of hand muscles involved in precision and power grip after cervical SCI. Transcranial magnetic stimulation (TMS) will be used to examine transmission in corticospinal and intracortical pathways targeting finger muscles and an acoustic startle stimulus with and without TMS will be used to examine the contribution from brainstem pathways. In Aim 2, the investigators propose to enhance the recovery of grasping by using novel tailored protocols of non-invasive repetitive TMS targeting late indirect (I) descending volleys (iTMS) and an acoustic startle stimuli. iTMS and startle will be used during precision and power grip movements in a task-dependent manner to induce cortical and subcortical plasticity and enhance voluntary output of hand muscles. Later, iTMS and startle will be applied in a task-dependent manner during a motor training task that involves precision and power grip. These unique approaches aim at promoting neuroplasticity during functionally relevant grasping movements has not been used before.
Investigators
Eligibility Criteria
Inclusion Criteria
- •Participants who are unimpaired healthy controls:
- •Male and females between ages 18-85 years
- •Right handed
- •Able to complete precision grips with both hands
- •Able to complete full wrist flexion-extension bilaterally
- •Participants who have had a spinal cord injury:
- •Male and females between ages 18-85 years
- •Chronic SCI (\> 1 year post injury)
- •Spinal Cord injury at C8 or above
- •Intact or impaired but not absent innervations in dermatomes C
Exclusion Criteria
- •Exclusion criteria for enrollment For SCI and Healthy Control Subjects (4-8 exclusion for non-invasive brain stimulation only):
- •Uncontrolled medical problems including pulmonary, cardiovascular or orthopedic disease
- •Any debilitating disease prior to the SCI that caused exercise intolerance
- •Premorbid, ongoing major depression or psychosis, altered cognitive status
- •History of head injury or stroke
- •Pacemaker
- •Metal plate in skull
- •History of seizures
- •Receiving drugs acting primarily on the central nervous system, which lower the seizure threshold
- •Pregnant females
Arms & Interventions
Experiment 2
To accomplish this aim the investigators propose to complete one main experiment. The investigators will combine iTMS and/or acoustic startle with precision and power grip training to test the hypothesis that 'precision and power grip training outcomes will be enhanced by iTMS and startle induced plasticity'. In a randomized sham controlled design, SCI and control subjects will be assigned to: training+iTMS and training+sham iTMS and training+startle and training+sham startle.
Intervention: Sham iTMS
Experiment 1a
Examine physiological mechanisms contributing to the control of precision and power grip behaviors. To accomplish this aim the investigators propose to complete one main experiment. The investigators will test the hypotheses that there are two fundamentally distinct modes of hand operation after SCI. One involves brainstem pathways, and permits whole-hand 'power grip', while the other involves corticospinal and motor cortical connections, and allows a wide range of fractionated finger movements (precision grip) after SCI. Measurements of corticospinal, reticulospinal, and motoneuron excitability will be tested during index finger abduction, precision and power grip.
Intervention: iTMS
Experiment 1a
Examine physiological mechanisms contributing to the control of precision and power grip behaviors. To accomplish this aim the investigators propose to complete one main experiment. The investigators will test the hypotheses that there are two fundamentally distinct modes of hand operation after SCI. One involves brainstem pathways, and permits whole-hand 'power grip', while the other involves corticospinal and motor cortical connections, and allows a wide range of fractionated finger movements (precision grip) after SCI. Measurements of corticospinal, reticulospinal, and motoneuron excitability will be tested during index finger abduction, precision and power grip.
Intervention: Motor Task
Experiment 1b
To accomplish this aim the investigators propose to complete one main experiment. The investigators will use iTMS and/or an acoustic startle stimuli to test the hypothesis that induced-plasticity protocols (iTMS and startle stimuli) will enhance EMG and force output in hand muscles during grasping. In a randomized sham crossover design, SCI and controls will be assigned to two groups: (1) iTMS applied during precision and power grip (two randomized sessions), and (2) startle applied during precision and power grip (two randomized sessions).
Intervention: iTMS
Experiment 1b
To accomplish this aim the investigators propose to complete one main experiment. The investigators will use iTMS and/or an acoustic startle stimuli to test the hypothesis that induced-plasticity protocols (iTMS and startle stimuli) will enhance EMG and force output in hand muscles during grasping. In a randomized sham crossover design, SCI and controls will be assigned to two groups: (1) iTMS applied during precision and power grip (two randomized sessions), and (2) startle applied during precision and power grip (two randomized sessions).
Intervention: Motor Task
Experiment 2
To accomplish this aim the investigators propose to complete one main experiment. The investigators will combine iTMS and/or acoustic startle with precision and power grip training to test the hypothesis that 'precision and power grip training outcomes will be enhanced by iTMS and startle induced plasticity'. In a randomized sham controlled design, SCI and control subjects will be assigned to: training+iTMS and training+sham iTMS and training+startle and training+sham startle.
Intervention: iTMS
Experiment 2
To accomplish this aim the investigators propose to complete one main experiment. The investigators will combine iTMS and/or acoustic startle with precision and power grip training to test the hypothesis that 'precision and power grip training outcomes will be enhanced by iTMS and startle induced plasticity'. In a randomized sham controlled design, SCI and control subjects will be assigned to: training+iTMS and training+sham iTMS and training+startle and training+sham startle.
Intervention: Motor Task
Experiment 2
To accomplish this aim the investigators propose to complete one main experiment. The investigators will combine iTMS and/or acoustic startle with precision and power grip training to test the hypothesis that 'precision and power grip training outcomes will be enhanced by iTMS and startle induced plasticity'. In a randomized sham controlled design, SCI and control subjects will be assigned to: training+iTMS and training+sham iTMS and training+startle and training+sham startle.
Intervention: Training
Outcomes
Primary Outcomes
Changes in amplitude of Motor evoked potential size
Time Frame: Post treatment at minute 0, minute 10, minute30, minute 60.
At the stated minute interval TMS measurements are reassessed.
Secondary Outcomes
- Grip Strength and 9-hole peg test(Post treatment at minute 0, minute 10, minute30, minute 60.)