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.

Inclusion Criteria:

• Clinically defined or probable diagnosis of ALS according to El Escorial criteria revised with Awaji's electro-diagnostic algorithm.
• Over 18 years old.
• Signed informed consent
• If patient on Riluzole, the dosage should be stable for 1 month and continued throughout the study period.

Exclusion Criteria:

• Patients with excessive cognitive disorders, limiting the understanding of task or with apparent communication difficulties hindering data collection.
• Any other previous or present pathology having an impact on motor function.
• Recent surgery or trauma (less than 6 months) in the upper or lower limbs.
• Prior neurological, endocrine, infectious, allergic, or chronic or acute inflammatory pathology in the three weeks preceding inclusion.
• Patients participating in an interventional clinical trial.