Power Training Post-stroke

Skeletal Muscle Plasticity As An Indicator of Functional Performance Post-Stroke

Hemiparesis, strictly defined as (muscular) weakness affecting one side of the body, is seen in three-quarters of individuals following stroke. Weakness in this population results from both neural and muscular factors which include, respectively, the ability to activate skeletal muscle as well as the force generating capacity of the muscle. The overall goal is to improve walking in persons post-stroke by training subjects with an intervention that specifically targets existing neural and muscular impairments, thereby facilitating locomotor recovery.

Study Overview

• Status: Completed
• Conditions: Stroke
• Intervention / Treatment: Behavioral: POWER training

Detailed Description

A primary impairment associated with post-stroke hemiparesis is the failure to make rapid graded adjustment of muscle force (i.e. muscle power) within the context of purposeful complex synergies (e.g., coordination during walking). Not surprisingly, the impact of stroke on walking is significant, with less than 50% of survivors progressing to independent community ambulation. Even among those who achieve independent ambulation, significant residual deficits persist in balance and gait speed, with ~75% of persons post-stroke reporting limitations in mobility related to walking. Muscle weakness is the most prominent motor consequence among the nearly 6 million survivors of stroke living in the United States and the strongest predictor of functional disability in this large clinical cohort. To date, the physiological mechanisms that contribute to muscle dysfunction in hemiparetic subjects are largely unstudied. Moreover, evidence regarding the efficacy of interventions aimed at attenuating impaired muscle function and the ensuing functional consequences in the post-stroke population is equivocal and viable therapeutic options to remediate hemiparetic muscle weakness remain among the most pressing challenges for biomedical research. The investigators propose that impaired muscle power (the product of muscle strength and velocity) generation is causal of functional (walking) disability post-stroke. In addition, coordination deficits are also critical determinants of functional performance. The investigators have developed a comprehensive theoretical framework that defines and measures the factors underlying disordered muscle function and coordination and will apply this framework to Post-stroke Optimization of Walking using Explosive Resistance (POWER) training. The investigators' goals over the four year funding period are to 1) quantify neural and muscular adaptations that contribute to impaired muscle power generation post-stroke; 2) assess effects of POWER training on neural and muscular adaptations in paretic and non-paretic muscle; and 3) determine the relationship between changes in neural and muscular adaptations following POWER training and locomotor improvements. Innovative aspects of the proposed work include the novel training intervention; the advanced magnetic resonance assessments; as well as the unique measure of the coordination that the investigators propose. It is the investigators' belief that: a) neural and muscular adaptations following stroke are associated with impaired muscle power generation as well as locomotor ability, b) POWER training attenuates functional deficits by addressing the underlying neural and muscular elements and c) functional improvements following training are predicated on improving the most prominent neural and muscular contributors to muscle power generation. If correct, the data generated will provide an entirely new level of evidence regarding the effectiveness of this novel intervention strategy on improving functional performance as well as the importance of peripheral muscle properties as predictors of locomotor ability post-stroke.

• Study Type: Interventional
• Enrollment (Actual): 56
• Phase: Phase 2

Contacts and Locations

Study Locations

• United States
  • South Carolina
    • Charleston, South Carolina, United States, 29401-5799
      • Ralph H. Johnson VA Medical Center, Charleston, SC

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 50 years to 70 years (Adult, Older Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• age 50-70,
• stroke within the past 6 to 24 months,
• residual paresis in the lower extremity (Fugl-Meyer Lower Extremity motor score <34),
• ability to walk without assistance and without an ankle foot orthotic (AFO) on the treadmill 30 seconds at speeds ranging from 0.3 - 0.8 m/s, and
• provision of informed consent.
• In addition, all subjects who meet criteria for the training portion must complete an exercise tolerance test and be cleared for participation by the study cardiologist.

Exclusion Criteria:

• Unable to ambulate at least 150 feet prior to stroke, or experienced intermittent claudication while walking;
• rating on Modified Ashworth Scale 3 at the knee or ankle;
• limited lower extremity range of motion of the knee (passive flexion Range of Motion [ROM] < 90); hip (inability to achieve neutral 0 hip extension); or ankle (inability to achieve 0 of active dorsiflexion);
• history of congestive heart failure, unstable cardiac arrhythmias, hypertrophic cardiomyopathy, severe aortic stenosis, angina or dyspnea at rest or during activities of daily living (ADLs);
• History of chronic obstructive pulmonary disease (COPD) or oxygen dependence;
• Preexisting neurological disorders, dementia or previous stroke;
• History of major head trauma;
• Legal blindness or severe visual impairment;
• history of significant psychiatric illness
• Life expectancy <1 yr.,
• Severe arthritis or other problems that limit passive ROM;
• post-stroke depression (PHQ-9 10),
• History of deep vein thrombosis (DVT) or pulmonary embolism within 6 months;
• Uncontrolled diabetes with recent diabetic coma, or frequent insulin reactions;
• Severe hypertension with systolic >200 mmHg and diastolic >110 mmHg at rest;
• Previous or current enrollment in a trial to enhance motor recovery;
• Presence of non-magnetic resonance (MR) compatible implants, pregnancy or severe claustrophobia.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: Double

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: POWER; Individuals with chronic post-stroke hemiparesis will undergo training to improve muscle power generation for 24 sessions (3 times/week) that includes both resistive and task-specific elements. Session duration will be ~90 minutes/day (inclusive of rest intervals). Training will include five distinct resistance activities aimed at improving muscle power-- each previously reported to contribute to improved walking.

Behavioral: POWER training; Individuals with chronic post-stroke hemiparesis will undergo training to improve muscle power generation for 24 sessions (3 times/week) that includes both resistive and task-specific elements. Session duration will be ~90 minutes/day (inclusive of rest intervals). Training will include five distinct resistance activities aimed at improving muscle power-- each previously reported to contribute to improved walking; Other Names: strength training

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Gait Speed	The speed the subject chooses to walk when instructed to walk at their "comfortable speed"	8 weeks

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Muscle Strength	The strength of the paretic lower leg muscles will be measured by asking the participants to contract their muscles as forcefully as possible. Testing will be conducted on a specialized machine called an isokinetic dynamometer. This testing is designed to assess the ability to generate muscle power. Before testing the participants will be asked to perform 5 minutes of low intensity cycling. Strength testing will include movements at the hip, knee and ankle in both legs.	8 weeks

Collaborators and Investigators

• Sponsor: VA Office of Research and Development
• Investigators: Principal Investigator: Chris M Gregory, PhD, Ralph H. Johnson VA Medical Center, Charleston, SC

Study record dates

Study Major Dates

• Study Start (Actual): October 1, 2013
• Primary Completion (Actual): September 29, 2017
• Study Completion (Actual): May 31, 2019

Study Registration Dates

• First Submitted: October 22, 2013
• First Submitted That Met QC Criteria: October 22, 2013
• First Posted (Estimate): October 28, 2013

Study Record Updates

• Last Update Posted (Actual): March 6, 2020
• Last Update Submitted That Met QC Criteria: February 20, 2020
• Last Verified: February 1, 2020

More Information

Terms related to this study

• Keywords: exercise; rehabilitation; walking
• Additional Relevant MeSH Terms: Cardiovascular Diseases; Vascular Diseases; Cerebrovascular Disorders; Brain Diseases; Central Nervous System Diseases; Nervous System Diseases; Stroke
• Other Study ID Numbers: O0844-R

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No