i see the breakdown in communication. i know nonerz cranks up the intensity, if there were just a way to cut out all the fluff and get to the tough stuff with a light warmup that would be a more productive spin class.
the part that CP was talking about in the article is the high speed sprints with nearly no resistance. thats making you tired but not challenging the muscles that much. it burns out the CNS fast, people only percieve fatigue as fatigue, "all i know is my legs are dead". this could have been muscular or neural.
ive actually used spin bikes as cardio, but i get on, warm up for about a minute or 2, then out of the seat, high tension for a minute, back down to recover for a minute, so on and so forth. real intervals. alot of the speed work i dont need to get tired, i can take the strong turtle method. hehehe.