With short bursts of intense lifting (singles and doubles), blood sugar is not the primary fuel. Blood sugar only becomes an issue when you are doing higher reps. Cortisol is released mainly as a way to cope with these high reps, a way to shuttle more fuel (blood sugar) into the muscle tissue by using higher blood pressure. This is one reason bodybuilders have their posing trunks in a bunch over it. Cortisol is dealt with just like serotonin. The body tries to adapt to using it, and all the bodybuilders run and scream. If they stuck with it they'd go through a response much like the Dark times, and they'd be able to handle more high rep sets afterwards.
In this case, cortisol is specific to the activity bodybuilders, not power or olympic lifters. Keep your reps low and you never have to worry about it. (It has nothing to do with total volume, only reps in the set.)