Fig. 3
From: Paced breathing causes tonic change rather than phasic modulation of superficial venous diameter
Examples from participant #17 with vein diameter and respiration. Dynamic changes in respiration and vein diameter of one participant. Vein diameter modulation was consistent with respiration. The horizontal axis represents time and the vertical axis denotes vein diameter (left) and the temperature change around the perinasal (right). The solid line indicates the vein diameter and the dashed line represents respiration. Perinasal temperature decreases with inspiration and increases with expiration. The upper panel shows SB and the middle and lower panels demonstrate 3 s-PB and 10 s-PB, respectively