Actually a cycling friend of mine decided he wanted to sprint faster so he did sets of 50 squats with a 100 pound barbell. He fucking blew up. I never saw anything like it. He did set after set. I could never do that- I'd go insane!
I do think it's all about generating huge amounts of lactic acid.
Back in the day there was a Greek kid who trained in our gym.....he did 20 squats with 135.185,205,225,250,then he would do as many as he could get with 200 pounds......kid looked great....name was Jack Kousaris....placed in the NABBA Universe if I recall or he entered it at least.'
He`s on musclememory.com sevreal times but each time his name was misspelled wrong......if you searched alphabetically under the letter "K", you could figure out who he was regardless of the fucking misspelling.
HIS FUCKING QUADS WERE UNREAL !!