Figure 2. Plasma NO₂⁻ and NOx at rest without and with infusion of NAC.

Femoral arterial and venous blood samples were collected during resting conditions without (CON) or with (NAC) infusion of N-acetylcysteine in young sedentary (n= 6–8), older sedentary (n= 6–8) and older active (n= 6–8) subjects. Values are means ± SEM. *Significantly different from control conditions, P < 0.05.