RAAS in posture study. Percent increase when changing from LLD to upright posture among the RAAS hormones. *Aldo v PRA, p < 0.0001. Across study periods, the % change in PRA was greater postpartum than during pregnancy (3T v PP, p < 0.05) but Aldo was greater during pregnancy compared to postpartum (2T v 3T, p < 0.05; 2T v PP, p = 0.15). Within study periods, the % change in Aldo was greater than the % change in PRA during both trimesters ( p < 0.0001). Postpartum the % change in Aldo was similar to the % change in PRA.