400 metres hurdles to 400 metres, or one lap of the stadium, and the number of hurdles was reduced to ten. The official height of the hurdles was set to 91.4 cm (3 feet) for men and 76.20 cm (2 ft, 6 inches) for women. The hurdles were now placed on the course with a run-up to the first hurdle of 45 metres, a distance between the hurdles of 35 metres each, and a home stretch from the last hurdle to the finish line of 40 metres. The first documented 400 m hurdles race for women took place in 1971. The International Association
Men's 110 metres hurdles world record progression Men's 110 metres hurdles world record progression The following table shows the world record progression in the Men's 110 metres hurdles. The first world record in the 110 metre hurdles for men (athletics) was recognized by the International Amateur Athletics Federation, now known as the International Association of Athletics Federations, in 1912. The IAAF ratified Forrest Smithson's 15.0 mark set at the 1908 London Olympics as the inaugural record. To June 21, 2009, the IAAF has ratified 39 world records in the event. From 1975, the IAAF accepted separate automatically electronically timed records for events up to 400 metres. Starting