In January 2019 researchers from the USA published their review of the medical scientific literature to assess the safety and effectiveness of exercise training for children and adolescents with juvenile idiopathic arthritis in respect to physical fitness, pain, functional capability and quality of life. A total of nine studies, involving 457 individuals aged 4-20 years with juvenile idiopathic arthritis, met the search criteria and were included in the review. Each individual received either a form of exercise training or alternate activity, were on the waiting list, or received no exercise training. Results showed that there was moderate quality evidence which supported the use of Stott Pilates or underwater knee-resistance exercise. No adverse effects of exercise training were reported. In fact 30-50 minutes of exercise training, 2-3 times/week for 12-24 weeks appeared to decrease pain, improve range of motion, knee strength, functional capability, and the quality of life.
Klepper S et al. Effects of Structured Exercise Training in Children and Adolescents With Juvenile Idiopathic Arthritis. Pediatr Phys Ther. 2019 Jan;31(1):3-21