Figure 2.

Plasma concentrations of (a) nitrate (NO${}_3^{-}$) and (b) nitrite (NO${}_2^{-}$) following ingestion of a red spinach extract (RSE; ●) and placebo (PBO; ○) at baseline (BL), 65–75 min following ingestion (PRE), and immediately following graded exercise testing (POST). Data are presented as mean absolute values in μM concentrations ± SD. When a significant time*treatment interaction was observed, post-hoc tests were performed using Student’s paired t-tests. * Significantly different from baseline within conditions (p < 0.01). † significantly different between conditions at the same time point (p < 0.01), respectively).