The Effects of FES in a Variety of Walking Conditions in People With MS

Inclusion Criteria: For people with MS: * Clinically definite multiple sclerosis according to the revised McDonald criteria. * People with EDSS ≤ 5.0. * People with MS who experience foot drop. * Able to walk at least 200 meters unassisted, i.e without walking aids. For healthy participants: * Not been diagnosed with any neurological disease or have any other condition or injury which will affect walking ability. Exclusion Criteria: For people with MS: * Clinically diagnosed relapse within the last month. * Any musculoskeletal impairment that can affect walking ability. * Cognitive impairments; with a score in the Multiple Sclerosis Neuropsychological Screening Questionnaire (MSNQ) ≤ 75. * Depression and anxiety; with a score in Hospital Anxiety \& Depression Scale (HADS) \> 10.