Figure 1: The position of acupunctured points and the area divisions for analyzing mean blood perfusion. ○ denotes Chengshan (BL57), and the broken line denotes bladder meridian. △ denotes the nonacupoint on bladder meridian, and □ denotes the nonacupoint off bladder meridian. The upper set of the figure is the direction of foot, and the inferior set is the direction of head.