Effects of 4 wk of physical inactivity on serum markers of systemic inflammation. Leptin (A), monocyte chemoattractant protein-1 (B), RANTES (C), tumor necrosis factor alpha (D), and interleukin-6 (E). All values are expressed as means ± SE (n = 7 or 8/group). a,b,cValues with different superscripts are significantly different, P < 0.05.