Evaluation of Home Based Assessments on Participants With DMD

Inclusion Criteria: For DMD patients: 1. Parent/guardian or participant is able to give informed consent and/or assent as required by local regulations, and all are willing and able to comply with the protocol. 2. Participant is assigned male sex at birth and is age 4 to \<13 years at time of consent. 3. Participant has a confirmed diagnosis of DMD based on genetic testing and/or clinical records consistent with the diagnosis. 4. Participant has been on a stable glucocorticoid dose for 3 months prior to participation. 5. Participant is ambulatory as defined by the ability to walk down a hallway at home without assistance or support. For healthy age-matched controls: 1. Parent/guardian or participant is able to give informed consent and/or assent as required by local regulations, and all are willing and able to comply with the protocol. 2. Participant is assigned male sex at birth and age 4 to \<13 years at time of consent. Exclusion Criteria: For DMD Patients: 1. Participant is/was enrolled in any interventional study for DMD in the past 3 months or has ever been enrolled in a gene therapy study. 2. Participant is on any approved therapy for DMD except for glucocorticoids. 3. Participant is currently or was previously treated with exon-skipping antisense oligonucleotides such as eteplirsen, golodirsen, casimersen, and viltolarsen. 4. Participant has any prior or ongoing medical condition, medical history, or physical finding that could affect the participant's ability to perform the study assessments. 5. Participant has had major surgery within 3 months prior to recruitment or planned orthopedic surgery for any time during this study which would interfere with the ability to perform assessments. 6. Participant has a history of allergic response to silicones or adhesives. 7. Participant has an active implanted device (e.g., pacemaker). Implanted devices relying on an electrical power source to function are considered active devices. For healthy age-matched controls: 1. Participant has a known musculoskeletal disease or had a musculoskeletal injury in the past 3 months. 2. Participant has other illness that precludes functional testing. 3. Participant is enrolled in any interventional study. 4. Participant has or has had any prior or ongoing medical condition, medical history, or physical finding that could affect the participant's ability to perform the study assessments. 5. Participant has had major surgery within 3 months prior to recruitment or planned orthopedic surgery for any time during this study which would interfere with the ability to perform study assessments. 6. Participant has a history of allergic response to silicones or adhesives. 7. Participant has an active implanted device (e.g., pacemaker). Implanted devices relying on an electrical power source to function are considered active devices.