Healthy subjects aged 0-18 years old. Subjects cannot have a presence or past history of a neurological disorder or other disease that would be expected to substantially impact health.

Male subjects aged 0-18 years old with genetic or histopathologic diagnosis of duchenne muscular dystrophy, or signs and symptoms of DMD and genetic or histopathologic diagnosis in a family member. Additionally, subjects cannot have the presence of a superimposed neuromuscular or other medical condition that substantially impacts the individual's health or ability to cooperate.

Up to 11 muscles will be measured using EIM technology. These muscles include: Right Lateral Deltoid, Right Biceps, Right Triceps, Right Wrist Flexors, Right Wrist Extensors, Right Vastus Lateralis, Right Tibialis Anterior, Right Gastrocnemius, Right Gluteus Medius, Right Biceps Femoris, and Right Thoracic Parapinal.