 Most sprinters spring out of the blocks with their fastest time and slow down as the race progresses, but Pistorius ran a "negative split", starting slowly and building up speed in the last half of the race (though he no longer uses this pattern).His average time was also less in the 400m race when compared to other runners than in the 200m.Controversy about the use of the blades persists, but the research provided considerable information on how they work in application, and other research is expected to follow.