Ultrasound Measurement of Quadriceps Shortening During Neuromuscular Electrical Stimulation in Critically Ill Patients

NMES will be applied to the quadriceps muscle to generate muscle contraction. Ultrasound measurement of the quadriceps thickness will be provided during contraction and rest, and the shortening of the quadriceps muscle will be measured. A second measurement using Shear-wave elastography measurement will also be undertaken. The measures will be undertaken at day 1 of neuromuscular blockers liberation (if any) as well as at day 3 and day 7 for the patients that will still be received mechanical ventilation at that time.