Table 3.

Dimensional characteristics of coronary arterioles

	NC-Sed (n = 67)	NC-Ex (n = 15)	HC-Sed (n = 33)	HC-Ex (n = 14)
Passive diameter, μm	146±5	173±10	147±6	164±11
%Preconstriction	58±2	45±8*	64±2	49±6
ET-1, [nM]	0.5±0.1	0.5±0.1	0.5±0.1	0.5±0.1

Values are mean ± SE; n indicates number of arterioles studied. NC, normal cholesterol; HC, hypercholesterolemic; Sed, sedentary; Ex, exercise trained; %preconstriction, %maximal diameter to which arterioles were preconstricted; ET-1, concentration of endothelin-1 required to obtain %preconstriction.

^*Significantly lower level of preconstriction than NC-Sed and HC-Sed.