400m Sprint Record

Men's Outdoor
43.18 – Michael Johnson in Seville, Spain on 8/26/99

Men's Indoor
44.57 – Kerron Clement in Fayettevilee, Arkansas on 3/12/05

Women's Outdoor
48.70 - Sanya Richards in Athens, Greece on 9/17/06

Women's Indoor
50.64 - Diane Dixon in Seville, Spain on 3/10/91