Inclusion Criteria:  Patient aged 75 to 95 years Score ≥4 on the SARC-F screening questionnaire Enrolled in a social security plan (no AME) Informed and consenting patient  Exclusion Criteria:  BMI <18.5 or ≥30 kg/m2 Untreated/unbalanced endocrinological pathology Myopathy Inflammatory or autoimmune pathology Severe psychiatric pathology or severe cognitive disorders that do not allow the performance of examinations Patients who are dependent for all acts of daily life Patients with a very short life expectancy Fracture or trauma during the previous 6 months Bilateral hip prosthesis Skin problem that may interfere with the recording of surface EMG activity Patient under guardianship / curatorship