Continuous Measurement of Activity in Patients With Muscle Pathology and in Control Subjects. ActiSLA Part.

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.