Resting Energy Expenditure of the COronaVirus (COVID19) Patient in Reanimation Context

Inclusion Criteria: For the Ambulatory Obese Control Group, the inclusion criteria are: * Age ≥ 18 years; * Patient followed in the nutrition service; * Patient who benefited from an indirect calorimetry whatever the indication between 01/01/20 and 31/12/2020; * BMI\> 30. For the COVID Group and the Resuscitation Control Group, the inclusion criteria are: * Age ≥ 18 years; * Patient having undergone a resuscitation stay * Patient on mechanical ventilation (intubated or tracheotomized) during their stay in intensive care; * Patient having benefited from an indirect calorimetry upon arrival in intensive care; Only for the COVID Group: * Patient hospitalized in intensive care for COVID 19 infection diagnosed by a positive PCR via nasopharyngeal sampling or endotracheal aspiration. * Patient who has not yet carried out his post-resuscitation visit; Only for the Resuscitation Control Group: \- Patient hospitalized in intensive care for an indication other than an infectious cause. Exclusion Criteria: Non-inclusion criteria for the Ambulatory Obese Control Group: * Person deprived of liberty; * Person subject to legal protection measures; * Patient's opposition to participate in research. The non-inclusion criteria for the COVID Group and the Resuscitation Control Group: * For patients intubated during the resuscitation stay Fi02\> 70% which does not allow a correct interpretation of the calorimetry; * Pregnancy ; * Person deprived of liberty; * Person subject to legal protection measures; * Opposition of the patient or the person of trust to participate in the research. Only for the COVID Group: * Contraindication to indirect calorimetry (claustrophobia for post-resuscitation patients where calorimetry is performed with a mask); * Contraindication to bioimpedancemetry (electronic implants, limb amputation, weight \<30kg or\> 300kg);