OBJECTIVE: The purpose of this study was to determine whether whole-body vibration training could improve standing balance and muscle strength in children with Down syndrome. DESIGN: This study was a randomized controlled trial studying 30 children (8 to 10 yrs old) with Down syndrome. They were assigned randomly using sealed envelopes, with 15 children allocated to the control group (9 boys, 6 girls) and another 15 children allocated to the study group (8 boys, 7 girls). The control group received a designed physical therapy program, whereas the study group received the same program given to the control group in addition to whole-body vibration training. Both groups received the treatment sessions three times per week for 6 successive months. Measurement of stability indices by using the Biodex Stability System as well as muscle strength of the knee flexors and extensors by using a handheld dynamometer was done before and after the 6 mos of the treatment program. RESULTS: Each group demonstrated significant improvements in stability indices and muscle strength after treatment (p < 0.05), with significantly greater improvements seen in the study group when compared with the control group (p < 0.05). CONCLUSIONS: Whole-body vibration may be a useful intervention modality to improve balance and muscle strength in children with Down syndrome.

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