[quote author="Jeremy Richmond" date="1253938179"]The question is really why would someone want to train excessively heavy?
I don’t think anyone is advocating that. I merely suggest the world would not come to an end if they throw in a small number of reps at 85%.[/quote]
That statement I posted was not directed at you but at the broader athletic community. They take a basic exercise like the squat and turn it into a series of record breaking periods of training without any consideration of such factors like pennation angle of the muscle being developed, recruitment speed of the muscles, or recruitment sequence required in the coordinated pattern of the biomechanical movement they are trying to improve in such as the sprint start (3rd step for example), top speed, or jump.
Heavy training does have some benefit to sprinting/athletics/sport. One benefit is the ability to train the brian to produce a large pulse of electrical signals to activate the muscles or improve the capacity of the nerves to transmit the signals. (Nerves use ATP as well and this needs to be trained).
Finally, I am an advocate of low reps (or equivalent intensity when speed of movement is taken into account) as regular part of a training program. Perhaps one such training period should be carried out every four weeks.