Fig. 5
From: Paced breathing causes tonic change rather than phasic modulation of superficial venous diameter
Effect of breathing period on the spectral power of vein modulation (n = 21). Comparison of the average spectral power of vein modulation of 3 s-PB and 10 s-PB. The vein modulation induced by 10 s-PB was significantly larger than that by 3 s-PB. Error bars represent SDs