Inclusion Criteria:  Patients older than 18 years Diagnosis of Charcot Marie Tooth disease, type 1A confirmed by molecular biology (duplication 17.p11.2) and by a pathological electromyogram, that is to say with demyelinating impairment (+/- axonal) dependent length Listening and written French Strength of the quadriceps superior to 2/5 MMT MRC Agreement after written information, clear and honest about the purpose of the study, the nature of the tests and their possible side effects or bothersome Health insurance cover  Exclusion Criteria:  Presence of other neurological comorbidity Presence of coronary artery disease unstabilized Peripheral neuropathy of other causes: diabetes, monoclonal gammopathy, malignancy, solid cancer, systemic autoimmune disease (lupus, Sjögren's disease, Wegener sarcoidosis ...), infectious disease (viral hepatitis, HIV ...), drugs known to be responsible for iatrogenic neuropathy. Gait trouble of other origin Patients unable to give their consent. Intellectual deficit that does not allow to comply with tests Patient under guardianship, or protection of justice.