Fig. 2.

MAP in old female SHR in baseline, first, second and third experimental periods (drug treatments), and fourth experimental period (recovery). Data are the average daily MAP for each rat, averaged together for each group, and presented as means ± SE for each day. *P < 0.05, grp 1 compared with Grp 3; §P < 0.05, for Grp 1 compared with Grps 2 and 3; ¶P < 0.05, Grp 2 compared with Grp 3. There are no symbols for differences compared with the previous experimental period. See Figs. 3 and 4 for differences with previous experimental periods.