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 the Rocky Mountain Masters Games. Australian Marge Allison holds the W70 record of 36.71 (+0.7), set August 12, 2015 in Lyon, France at the 2015 World Masters Athletics Championships. Allison also holds the W65 record set four years earlier at the same championships. Canadian Christa Bortignon set the W75 record of 39.89 (+0.0) at a domestic meet in Kamloops, British Columbia on May 18, 2013. American sprinting legend Irene Obera learned hurdles sufficiently to set the W80 record 42.24 (+1.2) on July 20, 2014 at the USATF Masters Championships in Winston-Salem, North Carolina. 200 metres hurdles The 200 metres hurdles