ActiALS is a multicentric academic study. Patients with amyotrophic lateral sclerosis (ALS) may be included on a voluntary basis. The investigators plan to include a group of approximately 30 patients with ALS.

The investigators have planned to assess patient every three months for a year. After each visit, participants will wear Actimyo for one month daily.

On each visit, participants will undergo a clinical examination with MRC sum score and Ashworth scores.

Participants will perform few tests (6-minutes walk test (6MWT), dynamometric measure, electromyography, and will answer to some questionaires (dysphagia handicap scale, Revised Amyotrophic Lateral Sclerosis Functional Rating Scale).

Actimyo is an innovative device intended to be used in a home-based environment. It is composed of two watch-like sensors, each containing a magneto-inertial sensors that record the linear acceleration, the angular velocity, the magnetic field of the movement in all directions.The two watches can be worn as wristwatch or placed near the ankle.

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.

Patients diagnosed with amyotrophic lateral sclerosis