Early Assessment of Quadriceps Muscle Recovery by Dynamometry and 3D Ultrasound in Intensive Care Patients Under Invasive Mechanical Ventilation

Inclusion Criteria: * Adults aged \> 18 years * Hospitalized in an ICU * Treated with invasive mechanical ventilation (MV) for at least 4 days during their stay (may be extubated at the time of inclusion) * Conscious and cooperative patients: ability to respond appropriately to the following commands: open and close eyes, look at me, nod your head, stick out your tongue, raise your eyebrows when I count to five * MRC score ≥ 3/5 for the "Leg Extension" function on either the left or right side * Informed consent obtained (no opposition) Exclusion Criteria: * Pregnant or breastfeeding women * Fracture or amputation of a lower limb * Acute or chronic brain or spinal cord injury responsible for hemiplegia or paraplegia * Unstable spinal injury * Neurodegenerative or chronic neurological disease * Guillain-Barré Syndrome * Myasthenia Gravis * Acute deep vein thrombosis of the lower limbs treated within the last 48 hours * Pre-existing motor deficit in a lower limb before the ICU stay, of any cause * Incarcerated or legally protected individuals (guardianship, curatorship) * Individuals without social protection