Figure 1.

Typical ultrasound images. Transversal ultrasound images of anterior radial muscle and anterior ulnar muscle (A), posterior tibial muscle and posterior fibula muscle (B). Maximal muscle thickness was measured separately between the upper fascia to radius and ulna leading edge or to tibia and fibula trailing edge at the widest distance. Pennation angles were measured between muscle fiber and the deep fascia of the muscle (C and D).