Final answer:
The nurse should recommend gentle range-of-motion exercises for juvenile idiopathic arthritis during a painful exacerbation to maintain joint flexibility, but should be performed within comfort limits and possibly under a physical therapist's guidance.
Step-by-step explanation:
The nurse should advise that, yes, the child with juvenile idiopathic arthritis should be encouraged to perform range-of-motion (ROM) exercises even during a painful exacerbation, to maintain joint flexibility. However, this should be done with care. While rest is important when the inflammation is active, early mobilization with gentle ROM exercises, once acute inflammation decreases, is essential to prevent stiffness and maintain function. These exercises should be gentle and within the child's comfort limits. In some cases, consultation with a physical therapist can help tailor an exercise regimen that is appropriate for the child's condition and needs.