Study of Adherence and Effects of Balance Exercices (SIEL BLEU Associatio)

Inclusion Criteria: * Diagnosis of Alzheimer's disease (AD) (DSM-IV/NINCDS-ADRDA criteria) * Age ≥ 65 years old * Mild AD (Mini-Mental State Examination score between 21 and 25), moderate AD (Mini-Mental State Examination score between 10 and 20) and severe AD (Mini-Mental State Examination score between 3 and 9) * Able to walk without any aid on 15 meters. * Near visual acuity ≥ 2 * Absence of severe depression (score of the 15-item Geriatric Depression Scale ≤ 10) * Written consent form to participate in the study (or trustworthy person or legal representative for severe AD) * Being affiliated to a social security regime Exclusion Criteria: * Musculoskeletal disorders not related to Alzheimer's disease * Near visual acuity \< 2 * History of cerebrovascular accident or other cerebro-spinal pathology * Poor workmanship of the written or oral French language * Refusal to be informed on possible hanging bare anomaly during study * Score of Mini-Mental State Examination \< 3 * Presence of severe depression (score of the 15-item Geriatric Depression scale \> 10) * Use of walking aid * Subject suffering from pre-existing impellent disturbances * Refusal to participate (or trustworthy person or legal representative)