If the classification between hereditary and acquired neuropathy is often easy, there is no completely specific marker allowing the distinction between the two etiologies. Clinical experience suggests that hereditary neuropathies have less impact on balance and gait than the acquired neuropathies at equivalent level of impairment, but this has never been clearly demonstrated.

Inclusion Criteria:

• CMT1A for molecular-proven Group 1 (PMP22 duplication)
• IPDC likely or defined for Group 2
• Able to walk 10 m unassisted

Exclusion Criteria:

• Neurological history other than neuropathy: epilepsy, stroke, dementia
• Pregnant women
• Person under guardianship or trusteeship
• Musculoskeletal conditions other than neuropathy impairing walking abilities
• Major comorbidity considered a contraindication by the investigator (cancer, unstable angor, etc.)