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Sponsored by: |
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) |
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Information provided by: | National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) |
ClinicalTrials.gov Identifier: | NCT00457314 |
Mitochondrial myopathies include various inherited diseases that are caused by damage to the mitochondria, energy-producing structures that fuel the body's processes. The main symptoms are muscle weakness, reduced muscle mass, and difficulty with exercising. The purpose of this study is to determine the effects of exercise training versus inactivity on mitochondrial function in muscle and muscle performance in people with mitochondrial myopathies.
Condition | Intervention | Phase |
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Mitochondrial Myopathy |
Behavioral: Exercise |
Phase II |
Study Type: | Interventional |
Study Design: | Treatment, Randomized, Open Label, Uncontrolled, Crossover Assignment, Safety/Efficacy Study |
Official Title: | Exercise Training and Deconditions: Implications for Therapy in Mitochondrial Myopathy |
Estimated Enrollment: | 50 |
Study Start Date: | June 2007 |
Estimated Study Completion Date: | June 2012 |
Estimated Primary Completion Date: | June 2012 (Final data collection date for primary outcome measure) |
Arms | Assigned Interventions |
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1: Experimental
Participants will partake in regular exercise training for 6 months. After 6 months, they will switch to no exercise training for 6 months. Participants will then be encouraged to continue exercise training for an additional 1 year.
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Behavioral: Exercise
Regular exercise training
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2: Experimental
Participants will not partake in regular exercise training for 6 months. After 6 months, they will switch to exercise training for 6 months. Participants will then be encouraged to continue exercise training for an additional 1 year.
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Behavioral: Exercise
Regular exercise training
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Mitochondrial myopathies are caused by mutant mitochondrial DNA, genetic defects in parts of the mitchondrial DNA. These defects can include missing or deleted DNA that typically codes for certain proteins involved in energy production. These mutations cause individual mitochondria and the body on a whole to produce energy less efficiently. Because muscle cells require extensive energy to function properly, they are particularly impaired by mitochondrial dysfunction. The onset of most mitochondrial myopathies occurs before the age of 20. Initially a person may experience muscle weakness and fatigue during physical activity. Other symptoms may include limited eye mobility, heart arrhythmias, slurred speech, swallowing difficulties, and impaired movement.
There is no cure yet for mitochondrial myopathies, nor is there any adequate treatment to stall disease progression. Exercise, known to boost the production and function of mitochondria in healthy people, may reduce symptoms in people with mitochondrial myopathies by increasing the number and function of normal mitochondria in an individual muscle cell. The purpose of this study is to determine the effects of exercise training versus inactivity on the expression of normal and mutant mitochondrial DNA and on mitochondrial production within muscle cells in people with mitochondrial myopathies. The study will also assess how cell function, physical endurance, heart function, and quality of life are affected by exercise training and inactivity.
Participants in this 2-year study will first undergo physiological exercise testing, magnetic resonance imaging (MRI) of heart and skeletal muscles, a needle biopsy of muscle, and a questionnaire on quality of life. Participants will then be randomly assigned to partake in regular exercise training or no training for 6 months. After 6 months, all participants will undergo repeat testing of initial evaluations. Participants who had been in the exercising group will then switch to no exercise training for 6 months, and participants who had been in the non-exercising group will switch to regular exercise training for 6 months. The second 6-month period will also be followed by repeat testing of initial evaluations. Participants will then be encouraged to continue exercise training for an additional 1 year, with retesting at the end of the second year. Each of the four evaluations will take about 15 hours over 5 days.
Ages Eligible for Study: | 18 Years to 60 Years |
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
Exclusion Criteria:
Contact: Ronald Haller, MD | 214-345-4621 | rhaller2@earthlink.net |
Contact: Marta Newny | 214-345-4655 | martanewby@texshealth.org |
United States, Texas | |
University of Texas Southwestern Medical Center | Recruiting |
Dallas, Texas, United States, 75321 | |
Principal Investigator: Ronald Haller, MD |
Principal Investigator: | Ronald Haller, MD | University of Texas Southwestern Medical Center |
Responsible Party: | Universit y of Texas Southwestern Medical School ( Ronald Haller ) |
Study ID Numbers: | R01 AR050597, 1 R01 AR050597-01A1 |
Study First Received: | April 5, 2007 |
Last Updated: | September 3, 2008 |
ClinicalTrials.gov Identifier: | NCT00457314 |
Health Authority: | United States: Federal Government |
single-large scale deletions point mutations in mtDNA |
Metabolic Diseases Muscular Diseases Neuromuscular Diseases Musculoskeletal Diseases |
Mitochondrial Myopathies Metabolic disorder Mitochondrial Diseases |
Nervous System Diseases |