Fig. 5.

Myogenic reactivity is decreased by vasodilator influences. Data are from Kuo et al. [34] in a and b and from Miller et al. [37] in c and d. a, c The pressure–diameter relationship for coronary arterioles under three different conditions of tone: (a) in the active state (control); (b) when partially dilated; (c) passive (no tone). b, d Contain the respective analysis of myogenic index. The more negative the numbers, the more myogenically active an arteriole is. Positive values indicate pressure-induced dilation