Reliability and validity of the modified Walking and Remembering Test in persons with multiple sclerosis

Cognitive dysfunction can adversely impact the walking ability of people with multiple sclerosis. However, valid and reliable standardized clinical tools to measure cognitive-motor interference or dual-tasking in people with multiple sclerosis remain lacking. This study evaluated the validity and reliability of the modified Walking and Remembering Test (mWART) in people with multiple sclerosis. Eleven adults (mean ± SD age, 51.1 ± 13.4 years) with multiple sclerosis (Expanded Disability Status Score, 2.0-6.0) and six adults (mean ± SD age, 41.5 ± 17.2 years) without multiple sclerosis were administered the mWART twice over a 2-week period. Participants were tested on gait and digit span length under single-task and dual-task conditions according to the mWART procedures over a 10-m walkway. intraclass correlation coefficient2,k were 0.961 for single-task gait velocity (P < 0.001), 0.968 for dual-task gait velocity (P < 0.001), 0.829 for single-task digit span (P = 0.004), and 0.439 for dual-task digit span (P = 0.154). Single-task gait velocity (P = 0.001) and dual-task gait velocity (P = 0.002) were able to discriminate between groups but dual-task costs were similar between participants with and without multiple sclerosis. Those with severe disability demonstrated the greater dual-task cost of gait velocity (P = 0.030). This study provides preliminary evidence of the mWART's validity and reliability in measuring dual-task performance in patients with multiple sclerosis with mild to severe disability. More research is required in more heterogeneous samples of persons with multiple sclerosis.