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  • Title: Six-minute walk test in patients with Down syndrome: validity and reproducibility.
    Author: Vis JC, Thoonsen H, Duffels MG, de Bruin-Bon RA, Huisman SA, van Dijk AP, Hoendermis ES, Berger RM, Bouma BJ, Mulder BJ.
    Journal: Arch Phys Med Rehabil; 2009 Aug; 90(8):1423-7. PubMed ID: 19651279.
    Abstract:
    OBJECTIVES: To examine the validity of the six-minute walk test (6MWT) as a tool to evaluate functional exercise performance in patients with Down syndrome (DS). DESIGN: Comparison of the six-minute walk distance (6MWD) in 2 distinct groups of DS patients: with and without severe cardiac disease. To test reproducibility, a group of patients with DS performed the 6MWT twice. SETTING: Tertiary referral centers for patients with congenital heart defects and outpatient clinics for people with intellectual disabilities. PARTICIPANTS: Adult patients with DS with (n=29) and without (n=52) severe cardiac disease categorized by cardiac echocardiography. INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURE: Distance walked on the 6MWT. RESULTS: The mean 6MWD in the group with severe cardiac disease was 289+/-104 m and in the group without severe cardiac disease 280+/-104 m (P=.70). Older age, female sex, and severe level of intellectual disability were all found to be independently and significantly correlated with a lower 6MWD (r=.67, P<.001). The paired 6MWD was not significantly different (310+/-88 m vs 317+/-85 m; P=.40) in patients who performed the 6MWT twice. The coefficient of variation was 11%. CONCLUSIONS: The 6MWD between the 2 groups was not significantly different. However, the walking distance inversely correlated with the level of intellectual disability. Therefore, the 6MWT is not a valid test to examine cardiac restriction in adult patients with DS.
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