1. 20 subjects affected by Dystrophin related muscular dystrophy (Becker Muscular Dystrophy ) 2. Subjects affected by muscular dystrophy not related to dystrophin impairment : 20 subjects affected by facioscapulohumeral dystrophy and 20 subjects affected by Limb Girdle Muscular dystrophy 3. 20 subjects affected by non-dystrophic myopathies (Congenital myopathies ) 4. 20 subjects affected by motor diseases: amyotrophic lateral sclerosis(ALS), Charcot Marie Tooth disease, Spinal Muscular Atrophy .