Introduction:Cognitive limitations in Down syndrome affect learning. Furthermore, improper performance of movement and low muscle tone are among the crucial causes of pos tural control impairment and gait ins tability in Down syndrome. This s tudy was aimed to inves tigate the role of secondary cognitive tasks on time of the s tance phase of subjects with Down Syndrome. Materials and Methods: 20 males with Down syndrome with a mean age of 11.50 ± 2.28 years were selected from the patients regis tered by the Down Syndrome Association in Rasht, Anzali, and Lahijan, Gilan Province, Iran. Participants performed two different cognitive tasks while walking on the Foot Medisense machine and the timing of the s tance-phase was measured. Results: The results showed no significant difference between the intra-group factors in the right and left heel s trike phase. However, the foot flat phase, mid-s tance phase, heel-off, and toe-off phase in the right and left heel s trike phase have shown significant differences. Furthermore, a significant difference between intra-group factors for the left and right leg was observed. Conclusion: Our data indicate that the evaluation of the s tance-phase could be used for the assessment of motor function in children with Down syndrome.

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