Inclusion Criteria:  The inclusion criteria for patients with PAH are as follows:  Between the ages of 6-18 Diagnosed with pulmonary arterial hypertension Clinically stable and receiving standard medical treatment  The inclusion criteria for healthy children are as follows:  1) To be between the ages of 6-18  Exclusion Criteria:  The exclusion criteria for patients with PAH are as follows:  1) Having any acute infection, orthopedic, neurological, cooperation, vision or hearing problems that may interfere during the measurements  The exclusion criteria for healthy children are as follows:  Having any acute or chronic illness Active or ex-smoker