Table 1. Time-domain results.

	RR(ms)	RR variance (ms2)	SP(mmHg)	SP variance(mmHg2)	DP(mmHg)	DP variance(mmHg2)	MP(mmHg)	MP variance(mmHg2)
Control	768 ± 85	1331 ± 380	142 ± 11	26.6 ± 21.1	78 ± 9	7.7 ± 2.5	100 ± 12	11.3 ± 3.9
Treatment	712 ± 95	841 ± 567	126 ± 10	12.0 ± 10.4	73 ± 8	5.7 ± 5.7	93 ± 11	7.7 ± 7.6
P	0.16	0.047	0.0001	0.18	0.1	0.23	0.15	0.34

Mean values ± s.d. of heart period (RR), systolic (SP), diastolic (DP) and mean (MP) arterial pressure, and their respective variance in 8 subjects, before (Control) and during administration of urapidil and angiotensin II (Treatment). P, statistical significance of changes between control and treatment by paired t test.