I also found something that said that lactate supply required by the brain (also fed by glucose but lactate is important during exercise) is reduced with time and intensity. I'm guessing that begins to explain what Scrap said about hydration, exercise fatigue and perception.
It also explains why if I want to distract myself during a long run I calculate what fraction I have left to run or have run already and recalculating that is so difficult in my semi-retarded state it keeps my mind fully occupied.
I always thought it was just glucose and oxygen but i guess it's more than that.
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