Table 1.

Effect of periarterial NS on perfusion pressure of mesenteric arterial beds obtained from WKY rats and SHRs of 4–6, 10–12, and 18–20 wk of age

	Basal	NS	Increase (NS − Basal)
WKY rats
4–6 wk old	32.4±5.1	91.2±4.7	59±5.8
10–12 wk old	19.6±0.7	87.6±10.4	68±9.6
18–20 wk old	24±0.6	85±11.2	61±11.5
SHRs
4–6 wk old	24.8±2.7	137±7.3	112±9*
10–12 wk old	28±1.2	182±5.5	154±7*
18–20 wk old	29±2.1	204±7.5	178±6**

Values are means ± SE of perfusion pressure (in mmHg). NS, nerve stimulation; WKY rats, Wistar-Kyoto rats; SHRs, spontaneously hypertensive rats.

^*P < 0.01 and

^**P < 0.001 compared with age-matched WKY rats.