RETN and type 2 diabetes mellitus: By contrast, Jamurtas et al. (2006) showed no changes in plasma resistin levels up to 48 h after a 45-min bout of cycling at 65% of VO2max, and no variations in the levels of this adipokine were found after 14 weeks of exercise with or without concomitant diet in post-menopausal women with type 2 diabetes (Giannopoulou et al., 2005).