You only have to look at the build os a sprinter versus a 1500m runner.
Human muscle fibres develope according to training and you get thick fibres which act fast but build lactic quickly and slow fibres which build lactic slowly.
put simply if a sprinter tried to carry that pace even over 400m he would be in agony the muscle just wouldn't work that well for that long.
When i trained i trained as a 400m runner which is classed as the longest sprint, we varied pace through the distance unlike 100m who go flat out, even the 200m runners don't take the first 100m at full pace.
the talking at the moment is whether bolt will run the 400m as many believe he could destroy the world record but the lack of prestige in the event will make it likely he will never do it which is a shame.
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