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
Athletics at the 2004 Summer Olympics – Men's 110 metres hurdles 1 January 2003 to 9 August 2004. For the men's 110 metres hurdles, each National Olympic Committee was permitted to enter up to three athletes that had run the race in 13.55 seconds or faster during the qualification period. If an NOC had no athletes that qualified under that standard, one athlete that had run the race in 13.72 seconds or faster could be entered. Qualification rule: The first four finishers in each heat (Q) plus the next eight fastest overall runners (q) qualified. Wind: +1.5 m/s Wind: +1.8 m/s Wind: +1.3 m/s Wind: −1.3 m/s Wind: +0.8 m/s Wind: