Table 2.

Phenylephrine induced baroreflex responses

	Pressor response (%SI mmHg−1)		Sympathetic gain (mmHg)
	WKY	SHR	WKY	SHR
Neonates	19.7 ± 2.9	28.6 ± 5.8	4.3 ± 1.3	5.8 ± 2.8
3 weeks	18.2 ± 2.2	20.9 ± 3.8	2.8 ± 0.7	3.8 ± 0.8
5 weeks	39.4 ± 9.4#	28.3 ± 1.8	2.2 ± 0.6	1.6 ± 0.1#

Mean (±s.e.m.) pressor response and degree of baroreflex evoked sympathoinhibition (sympathetic gain) in response to phenylephrine (10 μg, i.a.). #P < 0.05 compared to both neonate and 3-week-old of same strain (Student's t test), n= 5 per group.