Diagnostic Screening Tests and Potential Biomarkers in Mitochondrial Myopathies

Inclusion Criteria: * age 18-75 * verified mitochondrial myopathy * or healthy control * or disease control (another neuromuscular disease) Exclusion Criteria: * Patient has any prior or current medical conditions that, in the judgment of the Investigator, would prevent the patient from safely participating in and/or completing all study requirements. * Patient has symptoms of mitochondrial myopathy due to known secondary mitochondrial dysfunction * Patient does not have the cognitive capacity to understand/comprehend and complete all study assessments. * Pregnancy or breastfeeding.