Inclusion Criteria:  Age over 18 years old patients on hemodialysis for more than 3 months; patients without cardiological or infectious event for at least 3 months; patients having at least 2 dialysis session per week; patients affiliated with a health insurance plan; patients having signed an informed consent.  Exclusion Criteria:  Pulmonary fibrosis or active lung disease; residual diuresis over 500 mL per day; body mass index (BMI) < 21 and > 28 Kg/m²; medical history of major amputation (subgonal or transfemoral); pacemaker carrier; patients with orthopedic prosthesis.