Table 2.

Effect of hypertension and chronic hypoperfusion on passive structural characteristics of parenchymal arterioles

	WKY18	WKY18-CH	SHRSP18	SHRSP18-CH	SHRSP5
n	8	6	8	8	8
ID5	48.2 ± 4.6	52.7 ± 2.8	40.9 ± 3.3	41.0 ± 3.2†	38.4 ± 3.0
ID60	55.2 ± 3.9	68.2 ± 2.6	61.5 ± 5.3	63.0 ± 4.7	54.0 ± 3.1
OD5	62.2 ± 4.8	68.0 ± 2.6	59.4 ± 3.6	59.8 ± 4.1	55.9 ± 3.4
OD60	67.8 ± 9.4	80.8 ± 2.6	77.5 ± 5.5	78.5 ± 5.2	67.3 ± 3.8
WT5	7.00 ± 0.26	7.67 ± 0.42	9.25 ± 0.45§	9.39 ± 0.53‡	8.75 ± 0.31§
WT60	6.33 ± 0.21	6.33 ± 0.33	8.00 ± 0.50§	7.75 ± 0.53‡	6.63 ± 0.42
CSA5	1220 ± 123	1452 ± 89	1466 ± 132	1516 ± 185	1310 ± 124
CSA60	1220 ± 187	1473 ± 99	1758 ± 176*	1756 ± 211†	1287 ± 145

Values are means ± SE; n, no. of animals. WKY18-CH and SHRSP18-CH, WKY18 and SHRSP18 rats with chronic hypoperfusion, respectively; ID₅ and ID₆₀, inner diameter at 5 or 60 mmHg, respectively; OD₅ and OD₆₀, outer diameter at 5 or 60 mmHg, respectively; WT₅ and WT₆₀, wall thickness at 5 or 60 mmHg, respectively; CSA₅ and CSA₆₀, cross-sectional area at 5 or 60 mmHg, respectively.

^*P < 0.05 vs. WKY18 and

^§P < 0.01 vs. WKY18 by one-way ANOVA.

^†P < 0.05 vs. WKY18-CH and

^‡P < 0.01 vs. WKY18-CH by two-way ANOVA.