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Comparison between the levels of nitrite plus nitrate in the different treatment groups and at the different moments evaluated. Two-way repeated measures ANOVA. ∗p ≤0.001 in the comparison between M0 and M4 and M2 and M4. M0 (timepoint before receiving placebo or L-arginine supplement); M2 (timepoint two months after receiving placebo or L-arginine supplement); M4 (timepoint four months after receiving placebo or L-arginine supplement).
