Walking and cognitive impairments are common in persons with multiple sclerosis (MS). Approximately 85% of persons with MS report walking as a major limitation, whereas 65% experience cognitive dysfunction. Traditionally, walking and cognition have been viewed as unrelated, but there is evidence of cognitive-motor interference (CMI). CMI is believed to stem from damage to common neural tracts. Recent evidence supports cognitive-motor interference in persons with MS. For example, there is evidence that walking performance declines when performed in conjunction with a simultaneous cognitive task (i.e., dual task cost \[DTC\] of walking) and this decline in walking performance is greater in persons with MS compared to healthy controls. This elevated cognitive-motor interference during walking is mainly associated with walking performance in persons with MS although cognitive function does play a role. Cognitive-motor interference during mobility tasks is of practical and clinical importance because it has been linked to decreased community mobility and a greater risk of falls in other clinical populations. Despite the adverse consequences of elevated CMI there is ambiguity concerning prevention and rehabilitation strategies for cognitive-motor interference in individuals with MS.
This study seeks to examine whether single and/or targeted dual task rehabilitation has a beneficial effect on CMI in individuals with MS. The results of this investigation will provide the foundation for future rehabilitation-based randomized control trials seeking to improve walking and cognitive function in persons with MS.
