Inclusion Criteria:  Cardiac surgery under extracorporeal circulation, Postoperative diaphragmatic paresis (Diaphragmatic excursion <25mm), Consent for participation, Affiliation to the social security system  Exclusion Criteria:  History of respiratory pathologies, History of neurological pathologies, Post-operative cardiac and circulatory complications, Pregnant or breastfeeding women, Unable to understand, Guardianship, curators or safeguard of justice.