Kids with IBD: are they less fit than their peers?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * For children with IBD: * boy or girl aged 10 to 17 years old when signing the consent. * obtain the consent of participation of the child and the signed inform consent of the two parents or a legal representative. * Patient benefiting from health care- has IBD (Crohn's disease, ulcerative colitis and unclassified chronic colitis) for at least 6 months. * Contactable by phone For healthy controls: * Patient without IBD * Boy or girl aged 10 to 17 years old when signing the consent. * obtain the consent of participation of the child and the signed inform consent of the two parents or a legal representative. * Patient benefiting from health care Exclusion Criteria: * For children with IBD: * Acute intercurrent events at the time of inclusion which may lead to a decrease in physical fitness and activity, according to the judgment of the investigator (fractures, recent arthritis, ano-perineal lesions, severe dermatological lesions). * Patients with a disease a mild activity (PCDAI score \> 30 for children with Crohn disease and PUCAI \> 35 for children with ulcerative colitis. * Chronic, acute or intermittent diseases (other than IBD) that may lead to a decrease in physical activity (Example: fracture, paralysis, blindness ...). * Refusal of the child's participation in the protocol. * Refusal of one of the child's parents to participate in the protocol. * Participation in another interventional study. * Pregnant or lactating women. * Patient under protection of justice. For healthy controls: * Chronic, acute or intermittent diseases (other than IBD) that may lead to a decrease in physical fitness and activity (Example: fracture, paralysis, blindness ...). * Refusal of the child's participation in the protocol. * Refusal of one of the child's parents to participate in the protocol. * Participation in another interventional study. * Pregnant or lactating women. * Patient under protection of justice.