Stroke Clinical Trial
— BReaTHEOfficial title:
What Makes a Responder, a Responder? Biomarkers to Help Identify Responders and Resistors to High-intensity Interval Training for Lower Extremity Chronic Stroke
Stroke survivors with lower limb disability can improve their walking speed with high-intensity interval training (HIIT) rehabilitation therapy. However, some individuals may not respond to HIIT even when fully adherent to the program. To address this, the investigators propose to build a predictive model that identifies if a Veteran with chronic subcortical stroke will improve their walking speed with HIIT by incorporating blood lactate as an early predictor of exercise response, and inhibitory neurotransmitter gamma-aminobutyric acid (GABA) and regional cerebral blood flow (CBF) as predictors of the brain's potential to respond, while also taking into consideration other factors such as comorbidities, demographics, and fitness levels.
Status | Recruiting |
Enrollment | 55 |
Est. completion date | December 1, 2027 |
Est. primary completion date | June 1, 2027 |
Accepts healthy volunteers | No |
Gender | All |
Age group | 18 Years to 80 Years |
Eligibility | Inclusion Criteria: - chronic left or right subcortical stroke as defined by 6 months or more after a cardiovascular accident - lower extremity motor impairment due to stroke that causes a walking speed of less than 0.6 m/s during a 10m walk - Veteran status Exclusion Criteria: - MRI contraindications, including implanted cardiac pacemakers and severe claustrophobia - any neurodegenerative condition other than stroke that may lead to lower extremity impairment - a visual or auditory impairment that may hinder study procedures - any medical condition that would preclude participation in a physical exercise intervention program |
Country | Name | City | State |
---|---|---|---|
United States | Atlanta VA Medical and Rehab Center, Decatur, GA | Decatur | Georgia |
Lead Sponsor | Collaborator |
---|---|
VA Office of Research and Development | Atlanta VA Medical Center |
United States,
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Other | Repetition max strength test | To assess the leg strength of the affected and less affected leg. | baseline (week 1) and after the completion of 12 weeks of exercise (week 14) | |
Other | Global physical activity questionnaire (GPAQ) | To assess pre-stroke fitness levels. | baseline (week 1) | |
Other | Self-administered Comorbidity Questionnaire (SCQ) | To assess the presence and burden of comorbidities. | baseline (week 1) and after the completion of 12 weeks of exercise (week 14) | |
Primary | 10 m walk test on a GAITRite mat | To assess short-distance walking speed and gait characteristics. | baseline (week 1) and after the completion of 12 weeks of exercise (week 14) | |
Primary | Timed-Up-and-Go (TUG) test | To assess short-distance walking and postural control. | baseline (week 1) and after the completion of 12 weeks of exercise (week 14) | |
Primary | 6-minute walk test | To assess endurance. | baseline (week 1) and after the completion of 12 weeks of exercise (week 14) | |
Secondary | Blood lactate change during HIIT session | To assess if the participant increases their blood lactate during the HIIT session. | On exercise day 1, 4, 7, 10, and 28. The total number of exercise days is 36 (3 times per week for 12 weeks). | |
Secondary | MEGA-PRESS Magnetic Resonance Spectroscopy | To assess GABA from the ipsilesional and contralesional leg areas of the brain. | baseline (week 1) and after the completion of 12 weeks of exercise (week 14) | |
Secondary | pseudo Continuous Arterial Spin Labeling MRI | To assess whole brain regional cerebral blood flow. | baseline (week 1) and after the completion of 12 weeks of exercise (week 14) | |
Secondary | Graded treadmill or bike testing | To estimate VO2-max. | baseline (week 1) and after the completion of 12 weeks of exercise (week 14) |
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