Stabilizer in Abdominal Wall Muscles

At the beginning, patients will be in a supine position, the lower edge of the StabilizerTM will be placed between the posterior superior iliac spines, aligned with the sacral base. Abdominal manoeuvre will be developed by the patients until they reach 40 mmHg and hold steadily for 10 seconds. Prior the examination, each subject practiced the abdominal manoeuvre three times with an ultrasound image feedback.