Inclusion Criteria:  Subjects with genetically verified neuromuscular disease or healthy control Healthy controls needs to be healthy to be included, evaluated by the investigator  Exclusion Criteria:  Ferrous objects in or around the body Pacemaker or other implanted electronic devices Claustrophobia Inability to understand the purpose of the trial or corporate for the conduction of the experiments. Participation in other trials that may interfere with the results. Competing conditions at risk of compromising the results of the study, evaluated by the investigator. Strenuous exercise in the preceding 2 days before examination Pregnancy or breastfeeding