Inclusion and exclusion criteria
| Inclusion criteria | Exclusion criteria |
| Patients, age ≥18 years old, fulfilling the criteria for IIMs by EULAR/ACR.42 43 | Patients with sporadic inclusion body myositis and overlap myositis (myositis combined with another autoimmune rheumatic diseases), except Sjögren Syndrome. |
| Prednisolone ≤5 mg/day and stable dosage of immunosuppressive treatment for at least 1 month prior to inclusion in the study. | Comorbidity preventing resistance training (eg, severe heart/lung disease, uncontrolled hypertension (systolic >160 mm Hg and/or diastolic >100 mm Hg), severe knee/hip arthritis). |
| IIM diagnosis established at least 6 months prior to inclusion in the study. | Alcohol and/or drug abuse. Defined by the guidelines issued by The Danish Health Authority. |
EULAR/ACR, European League Against Rheumatism/American College of Rheumatology; IIMs, idiopathic inflammatory myopathies.