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
200 metres hurdles like this. Since it is a requirement, major championship meets have purchased a few sets of modern modified hurdles, which then creates the logistical problem of shipping these few hurdles between meets in order for the competitors to have an opportunity to race over proper hurdles. As a substitute, many older hurdle designs are easier to modify to get to the proper height and most facilities are less protective of the old, rusty hurdles in the junk pile. Also many training hurdles (used to teach smaller, youth beginners) will go to 27 inches and lower. After setting the world record