The first recorded event in the 400m hurdles was run in Oxford, England, around 1860, over 440 yards, with twelve wooden barriers 1.06m (3ft 6in) high embedded in the ground.
It was first adopted as an Olympic event at the 1900 Paris Olympics where the distance was modified to 400 metres with ten hurdles of 91.44cm (3ft) in height, separated by 35 metres. The first hurdle was placed 45 metres from the start, the tenth 40 metres from the finish. These metric distances have remained unchanged ever since.
The development of this event has mirrored that of the 110m hurdles: first the adoption of mobile hurdles which could be overturned by the sprinters and, later, with the progressive introduction of synthetic tracks.
The essential evolutionary factor in sprinting technique has been the reduction in the number of strides between hurdles
The current men world record of 46.78 was set by Kevin Young (USA) - also known as "Spiderman"- who successfully switched from 12 to 13 strides between barriers when most of his rivals were running 13 to 14 strides.
The first women's race at this distance, with 10 flights of 76cm (2ft 6in) high hurdles, took place in 1971. The IAAF officially sanctioned the event in 1974 and it was part of the 1983 IAAF World Championships. The first ladies Olympic gold was won the following year by Nawal El Moutawakel (Morocco).
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