title: The changing-criterion design: assessment of running behavior of a handicapped youth.
mesh_terms: D000293:Adolescent; D001521:Behavior Therapy / Q000379:methods*; D006233:Persons with Disabilities / Q000523:psychology*; D004495:Education of Persons with Intellectual Disabilities; D006801:Humans; D008297:Male; D010806:Physical Education and Training; D012420:Running