Functional Capacity in Children with Chronic Kidney Disease

This study measures physical fitness and functional capacity (the ability to do everyday tasks) in children and teenagers with chronic kidney disease (CKD), to understand how kidney disease affects physical health in young people. **You may be eligible if...** - You are between 6 and 18 years old - You have been diagnosed with chronic kidney disease - You are clinically stable - You or your parent/guardian is willing to participate **You may NOT be eligible if...** - You have a musculoskeletal condition (such as a bone or muscle problem) that would affect physical testing - You have a cognitive (thinking or intellectual) problem that would interfere with participation Talk to your doctor to see if this trial is right for you.