On: Mental fatigue impairs physical performance in humans (2009)

[matwood]

Correct. It's why it is hard to lift really hard past 45-60 minutes even if you are working different muscles. The CNS just wears down.

[beachstartup → matwood]

45 mins. is when i start hitting the wall. the muscles simply won't move!

[matwood → beachstartup]

Quite a few studies have shown, that unless you are 'chemically' enhanced, all work after about an hour does not do much more for strength or size.