The isokinetic strength of the knee extensor muscles of both limbs was evaluated in 25 children and adolescents with Down's syndrome. The Down's syndrome subjects were significantly weaker than control groups with average intelligence and with non-Down's syndrome mental retardation. Results suggested a dysfunction of the neuromuscular system,…

This is a report on research in the field of physical responses of children to strenuous activity. The paper is divided into three subtopics: (1) peak performance measure in children; (2) training effects on children; and (3) importance of physical activity for children. Measurements used are oxygen consumption, ventilation, heart rate, cardiac…