IRCT201204199517N1 IRCT 2012-07-06 Tehran University of Medical Sciences The effect of progressive ressistance exercise on children with down syndrome The study of the effect of progressive ressistance exercise in 8-11 years old children with down syndrome, with use of Bruininks Oseretsky Test 2012-09-22 anticipated 20 Complete https://irct.ir/trial/10088 interventional Randomization: Randomized, Blinding: Not blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment. N/A down syndrome. Intervention 1: intervention group: The subjects participated three times per week in a six-week, progressive, free-weight, strengthening programme. Free weights were used to provide resistance for the strength training in the form of adjustable weight cuffs attached by Velcro straps. For training, the children were positioned as for muscle strength testing with free weights. The training weight (TW) used in this study was 65% of the mean maximum isometric muscle strength value for each individual. Maximum strength was re-measured every two weeks during the six-week programme and the TW reset at 65% of the new value. At each TW the children progressed from three sets of five repetitions, to four sets of five, then three sets of ten as the number of repetitions became easy. Intervention 2: control group: wiil continue their regular activities followed at school.