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
2016 IAAF World U20 Championships – Women's 100 metres hurdles m/s 22 July<br> Start time: 9:55 Temperature: 21 °C Humidity: 49 %<br> Wind: +0.7 m/s Note:<br> IAAF Rule 168.7 - Not jumping each hurdle<br> IAAF Rule 168.7(b) - Deliberately knocking down a hurdle 22 July<br> Start time: 10:02 Temperature: 21 °C Humidity: 49 %<br> Wind: +1.5 m/s 22 July<br> Start time: 10:10 Temperature: 21 °C Humidity: 49 %<br> Wind: +1.0 m/s 2016 IAAF World U20 Championships – Women's 100 metres hurdles The women's 100 metres hurdles event at the 2016 IAAF World U20 Championships was held at Zdzisław Krzyszkowiak Stadium on 22, 23 and 24 July. 24 July<br> Start time: