Fig. 1.

Peak cardiac output during treadmill exercise versus peak quadriceps blood flow during knee extensor exercise; filled triangle younger men (n = 19), open triangle older men (n = 12; a); filled circle younger women (n = 17), open circle older women (n = 17; b). Peak cardiac output during treadmill exercise versus femoral artery conductance during peak knee extensor exercise; filled triangle younger men, open triangle older men (c); filled circle younger women, open circle older women (d). From Ridout et al. (2010). Reproduced with permission from the American Physiological Society