ActiSLA is a monocentric academic study. Patients with amyotrophic lateral sclerosis may be included on a voluntary basis. The investigators plan to include a group of approximately 20 patients with ALS. The investigators have planned to assess patient every three months for a year. On each visit, participants will undergo a clinical examination with MRC sum score and Ashworth scores. They will perform few tests ( 6-minutes walk test (6MWT), dynamometric measure, electromyography, Edinburgh Cognitive and Behavioural ALS Screen ) and will answer to some questionaires (dysphagia handicap scale, ALS-SFR-r). After each visit, participants will wear Actimyo for one month daily.