- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04515407
Plantarflexor PAS - Stroke (PAS - Stroke)
Paired Associative Stimulation to Facilitate Plantarflexor Power Following Stroke
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
The current project builds on preliminary work in which the investigators have observed a relationship between efficacy of the corticospinal tract serving the plantarflexors and walking function, specifically ankle plantarflexor power, in individuals with chronic post-stroke hemiparesis. The investigators have observed robust associations between: i) PF corticospinal efficacy, and ii) modulation of corticospinal drive, and PF power, particularly in individuals poststroke. Importantly, clinical and demographic factors including: age, stroke chronicity, and lesion location, neither explain, nor modify, these associations. In combination, these findings lead to the investigators' central premise, that improved efficacy of the corticospinal tract serving the plantarflexors will enable augmentation of ankle PF power and contribute to improved walking function in individuals post-stroke. Here the team will investigate use of paired associative stimulation (PAS) to enhance corticospinal efficacy and to the plantarflexors through targeted neuroplasticity. Specifically the team will investigate three approaches to PAS to determine its efficacy for enhancing: i) neural responses, ii) biomechanical effects (A2), and iii) retention of neural and biomechanical effects.
Objectives. This SPiRE project focuses on methodological variables required to optimize efficacy of PAS on:
a) corticospinal efficacy to the plantarflexors, and b) walking function (quantified as A2) in Veterans and adults with poststroke walking dysfunction. By achieving the aims, data generated from this SPiRE will contribute to development of more focused and relevant hypotheses to be tested in future studies supported through competitive Merit Review. However, before motivating a larger study, the investigators first seek to determine the salience and magnitude of effects of PAS. In addition to exploring methodological issues related to PAS, data generated from the proposed SPiRE will enable us to determine the appropriate scope of a future project including sample size and dosing. The investigators seek to develop the methodology, determine feasibility, and generate preliminary/exploratory data for sake of determining effect sizes and computing statistical power for future large scale studies in human subjects. The investigators will compare effects of PAS targeting ankle plantarflexion when delivered: at rest, during submaximal activity, and during walking.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Contacts and Locations
Study Contact
- Name: Carolynn Patten, PhD
- Phone Number: (916) 843-7000
- Email: carolynn.patten@va.gov
Study Contact Backup
- Name: Elliott S Perry, BS
- Phone Number: (530) 734-0653
- Email: elliott.perry@va.gov
Study Locations
-
-
California
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Martinez, California, United States, 94553
- Martinez Outpatient Clinic and Community Living Center, Martinez, CA
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- hemiparesis resulting from stroke
- single, unilateral, hemispheric stroke (cortical or sub-cortical areas)
- stroke confirmed by neuroimaging (CT or MRI)
- stroke 3 months prior to enrollment
- ability to walk, independently at least 25' on level ground, even if requiring brace or assistive device (cane)
- Veteran Status prioritized
Exclusion Criteria:
- lower extremity pain affecting ability to bear weight on legs
- contractures limiting normal range of motion in major lower extremity joints
- other neurological conditions (e.g., Parkinson's Disease, Multiple Sclerosis, ALS), prior traumatic brain injury, severe osteoarthritis or prior pathological fracture
- cardiovascular conditions contraindicative to walking or light exercise
- severe hypertension (i.e., >200/110 at rest that cannot be controlled in resting range of 180/110 mmHg)
- perceptual or cognitive deficits affecting ability to: comprehend, follow three step directions, or provide consent
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Other
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: Double
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Other: Order 1
All participants will receive PAS in three experimental conditions, randomized to the order of condition.
Experimental order will be counterbalanced across participants.
Order 1 will be: Seated@Rest, Seated@Active, Walking.
|
Paired Associative Stimulation will be delivered while the participant is seated and resting.
Other Names:
Paired Associative Stimulation will be delivered while the participant is seated and producing submaximal background activity in the plantarflexor muscles.
Other Names:
Paired Associative Stimulation will be delivered while the participant is walking, during the late stance phase of the gait cycle.
Other Names:
|
Other: Order 2
All participants will receive PAS in three experimental conditions, randomized to the order of condition.
Experimental order will be counterbalanced across participants.
Order 2 will be: Seated@Active, Walking, Seated@Rest.
|
Paired Associative Stimulation will be delivered while the participant is seated and resting.
Other Names:
Paired Associative Stimulation will be delivered while the participant is seated and producing submaximal background activity in the plantarflexor muscles.
Other Names:
Paired Associative Stimulation will be delivered while the participant is walking, during the late stance phase of the gait cycle.
Other Names:
|
Other: Order 3
All participants will receive PAS in three experimental conditions, randomized to the order of condition.
Experimental order will be counterbalanced across participants.
Order 3 will be: Walking, Seated@Rest, Seated@Active.
|
Paired Associative Stimulation will be delivered while the participant is seated and resting.
Other Names:
Paired Associative Stimulation will be delivered while the participant is seated and producing submaximal background activity in the plantarflexor muscles.
Other Names:
Paired Associative Stimulation will be delivered while the participant is walking, during the late stance phase of the gait cycle.
Other Names:
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
change in Motor Evoked Potential (MEP) size
Time Frame: immediately post-PAS
|
The difference in MEP size (area) post-PAS compared to pre-PAS will be quantified as the primary outcome for Aim 1. MEP size is considered an indicator of cortical/neural excitability.
An increase in MEP size would suggest that PAS enhanced cortical excitability.
MEP size can be expressed in either absolute/raw values or percentage change relative to baseline.
A single session of PAS lasts 30-45 minutes.
|
immediately post-PAS
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change in ankle plantarflexor power (A2)
Time Frame: immediately post-PAS
|
The difference in A2 post-PAS compared to pre-PAS will be quantified as the primary outcome for Aim 2. A2 quantifies the dynamic force producing capacity and is critical to forward progression during walking.
An increase in A2 amplitude, area, or slope would suggest that PAS enhanced cortical excitability/neural connectivity enabling production of greater, more effective plantarflexor power during walking.
A2 is expressed relative to the individual subject's body weight.
Change in A2 can be expressed in either these normalized units or percentage change relative to baseline.
A single session of PAS lasts 30-45 minutes.
|
immediately post-PAS
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Collaborators and Investigators
Investigators
- Principal Investigator: Carolynn Patten, PhD, Martinez Outpatient Clinic and Community Living Center, Martinez, CA
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Estimated)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Additional Relevant MeSH Terms
Other Study ID Numbers
- B3609-P
- 1I21RX003609-01 (U.S. NIH Grant/Contract)
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
product manufactured in and exported from the U.S.
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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