The assessed outcomes were: VO2 max and the associated power output during a progressive cycling test (65% of VO2 max), lactate levels in the vastus lateralis muscle measured with microdialysis, citrate synthase (CS) and β-hydroxyacyl-CoA dehydrogenase (β-HAD) activities in muscle biopsies and clinical improvement according to the criteria of the International Myositis Assessment and Clinical Studies Group (IMACS). Here, CS is linked to myositis disease.