Going places: Does the two-minute walk test predict the six-minute walk test in lower extremity amputees?
Lauren Reid , Penny Thomson , Markus Besemann , Nancy Dudek
Department of Medicine, Division of Physical Medicine and Rehabilitation, University of Ottawa, K1H 8M2 Ottawa, Canada. E-mail: firstname.lastname@example.org
Objective: Assessing a patient’s ability to walk the distance required for community ambulation (at least 300 m) is important in amputee rehabilitation. During the 2-min walk test, most amputees cannot walk 300 m. Thus, the 6-min walk test may be preferred, but it has not been fully validated in this population. This study examined the convergent and discriminative validity of the 6-min walk test and assessed whether the 2-min test could predict the results of the 6-min test.
Methods: A total of 86 patients with unilateral or bilateral amputations at the Syme, transtibial, knee disarticulation or transfemoral level completed the 6-min walk test, 2-min walk test, Timed Up and Go test, Locomotor Capabilities Index version 5, Houghton Scale of Prosthetic Use, and Activity-Specific Balance Confidence scale.
Results: The 6-min walk test correlated with the other tests (R = 0. 57–0. 95), demonstrating convergent validity. It demonstrated discriminative validity with respect to age, aetiology of amputation, and K-level (p < 0. 0001). The 2-min walk test was highly predictive of the 6-min walk test distance (R2 = 0. 91).
Conclusion: The 6-min walk test is a valid measure of amputee ambulation. However, the results suggest that it may not be necessary, since the 2-min walk test strongly predicts the 6-min walk test. Clinicians could therefore save time by using the shorter test.
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