Many athletes inhale pure oxygen after exercise in an attempt to increase muscular reabsorption of oxygen  Measured continuously after exercise, however, the blood lactate levels of athletes who inhale pure oxygen are practically identical, on average, to those of athletes who breathe normal air
The lower the blood lactate level is, the higher the muscular reabsorption of oxygen is
Athletes' muscular reabsorption of oxygen is not increased when they inhale pure oxygen instead of normal air.