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. Author manuscript; available in PMC: 2013 May 3.
Published in final edited form as: J Appl Physiol (1985). 2008 Jan 24;104(5):1273–1280. doi: 10.1152/japplphysiol.00954.2006

Table 1.

Mesenteric artery and vein morphology and vasoactive properties in Control animals and rats exposed to Head-Down Tilt (HDT).

Artery Vein
Con
n=11		 HDT
n=9		 Con
n=7		 HDT
n=6
Max. Diameter (µm) 243 ± 14 251 ± 19 244 ± 32 236 ± 11
Wall Thickness (µm) 44 ± 5 39 ± 6 21 ± 2 20 ± 5
Wall-to-Lumen 0.18 ± 0.1 0.16 ± 0.2 0.09 ± 0.01 0.09 ± 0.01
Initial Tone (%) 24 ± 4 21 ± 7 16 ± 6 2 ± 1*

Max. Diameter, intraluminal diameter measured in Ca2+-free solution at an intraluminal pressure of 108 cm H2O for arteries or 4 cm H2O for veins; Wall-to-Lumen, the wall intimal thickness divided by the maximal luminal diameter; Initial tone, the percent difference between the luminal diameter (in solution containing Ca2+) and the baseline diameter. Values are means + SE.

*

P<0.05 vs. Con for the same vessel type.