Muscle thickness measurements.
Rectus Femoris muscle thickness
Bilateral muscle thickness measurements were obtained for the rectus femoris (RF), vastus medialis oblique (VMO), and vastus lateralis (VL) muscles of the quadriceps femoris (QF) using the B-mode US and a 5 MHz scanning head (PROSOUND Alpha 6, Aloka, Tokyo, Japan). For optimal acoustic contact, a water-soluble transmission gel was applied to the scanning head. The scanner was placed perpendicular to the tissue interface at the predetermined marked locations. Muscle thickness was directly measured from the US display using electronic calipers, representing the distance from the interface between the adipose tissue and the muscle to the interface between muscle and bone (Fig. Ultrasonographic measurement of the Rectus Femoris muscle thickness.