Creatine Supplementation in Pediatric Rheumatology

Creatine supplementation may improve strength, muscle mass, bone mass and muscle function in healthy and elderly people. The investigators speculate that creatine supplementation could have therapeutic effects in pediatric rheumatic (i.e., juvenile systemic lupus erythematosus and juvenile dermatomyositis) patients who usually present muscle weakness, muscle wasting and bone mass loss.