Sublingual perfused boundary region corrected for erythrocyte (red blood cell [RBC]) increases after saline infusion. The correction of perfused boundary region (PBR) for erythrocyte showed no changes in erythrocyte-corrected perfused boundary region values after saline infusion (P = 0.14) compared to the low-sodium diet. The data are represented as the means and 95% CI (n = 12).