 A controversy over the effects of running blade length arose at the 2012 Paralympic Games, as Brazilian runner Alan Oliveira and USA runner Blake Leeper changed to longer running blades within a few months before the 2012 Paralympic Games.This led to marked improvement in their running times.Pistorius complained after the 200m race that the blades provided artificially lengthened running strides, which would be an infringement of the IPC rules, regardless of that the blades were within the allowable height limits for the athletes concerned.