Overall aim:~To investigate the effect of high-intensity strength training on quality of life, muscle strength, physical function, and disease activity in patients with myositis~Study design:~60 myositis patients will be included in a 16-week high-intensity strength training study. Patients will be randomly allocated into 2 groups (strength training and control) in a 1:1 ratio.~User involvement:~Myositis patients has been recruited to a patient advisory board. The advisory board's objective is to give patient-oriented project feedback, thus improving the overall research project.~Intervention:~Two training session per week for 16 weeks. Sessions consists of 3 sets of each exercise corresponding to 10 RM. Training progression will be accounted for and training loads will be evaluated weekly. The training protocol will be a full-body protocol, i.e. all major muscle groups will be engaged during each training session.~Outcomes:~The primary outcome is the Physical Component Summary Measure from the quality of life questionnaire (SF-36). Secondary outcomes include strength measures, functional tests, disease activity measures, questionnaires (e.g. International physical activity questionnaire), DEXA whole body scans, blood samples and muscle biopsies.
This study evaluates the effects of a high-intensity strength training in patients with myositis with the primary outcome being quality of life (SF-36). The study is designed as a parallel group randomised controlled trial with an intervention group and a control group.