The use of veno-venous extra-corporeal membrane oxygenation (VV-ECMO) for severe respiratory failure - mainly hypoxaemia - has increased over recent years. Similar to the general population in the Intensive Care Unit (ICU), these patients become deconditioned, severely weak (ICU acquired weakness- ICUAW) and require prolonged rehabilitation after disconnection from VV-ECMO. However, data regarding the magnitude of muscle wasting and recovery in this specific group is lacking.