Figure 1.

(A) Aortic stiffness increased in old males and females compared to younger monkeys. However, aortic stiffness was increased more in old males than old females. (B) There was little significant difference in collagen density in those groups. (C) Elastin density was decreased more in old males than the females. (D) The collagen/elastin ratio increased more in old males than old females. Reprinted from Qiu et al. (2007). ^*P < 0.05 vs. corresponding young animals; ^†P < 0.05 vs. corresponding old male monkeys.