A: comparison of FBF after undertaking low- and high-intensity exercise, during saline or l-NMMA infusion. There was no significant difference in FBF during l-NMMA infusion when compared with saline during either low-intensity exercise (P = 0.22, n = 11) or high-intensity exercise (P = 0.32, n = 11). B: a comparison of the FBF immediately after low- and high-intensity exercise and LBNP while infusing saline, l-NMMA, or SMTC. There is no significant difference in FBF during l-NMMA or SMTC infusion when compared with saline, for either low-intensity exercise (P = 0.91 and P = 0.44, respectively; n = 10) or high-intensity exercise (P = 0.46 and P = 0.68, respectively; n = 10).