The interferance effect
Or, combining peak power training with aerobic training - good for enduros .. BAD for sprinters!
I wrote an article in the tips & hints section of the site today. summarising some stuff I've been reading and asking people about here and there about the effects that aerobic training has on strength and power training. In short, strength training doesn't hurt enduros, but enduro training has a negative impact on sprinting.
The article is here.