Athletics at the 2010 South American Games – Women's 400 metres
# Athletics at the 2010 South American Games – Women's 400 metres

The Women's 400m event at the 2010 South American Games was held on March 20 at 18:30.

## Medalists

| Gold | Silver | Bronze |
| - | - | - |
| Bárbara de Oliveira Brazil | Yenifer Padilla Colombia | Yaneth Largacha Colombia |

## Records

Standing records prior to the 2010 South American Games :

| World record | Marita Koch | East Germany | 47.60 | Canberra, Australia | 6 October 1985 |
| - | - | - | - | - | - |
| World Leading | Rosemarie Whyte | Jamaica | 52.19 | Kingston, Jamaica | 20 February 2010 |
| South American record | Ximena Restrepo | Colombia | 49.64 | Barcelona, Spain | 5 August 1992 |
| South American U23 record | Ximena Restrepo | Colombia | 50.14 | Havana, Cuba | 5 August 1991 |

## Results

Results were published.

### Final

| Rank | Athlete | Nationality | Reaction | Result | Notes |
| - | - | - | - | - | - |
| | Bárbara de Oliveira | Brazil | 0.211 | 53.38 | |
| | Yenifer Padilla | Colombia | 0.181 | 54.09 | |
| | Yaneth Largacha | Colombia | 0.267 | 54.22 | |
| 4 | María Ayelén Diogo | Argentina | 0.257 | 56.11 | SB |
| 5 | Leslie Arnez | Bolivia | | 56.13 | SB |
| 6 | Cristiane dos Santos Silva | Brazil | 0.403 | 56.52 | |
| 7 | Juliana Menéndez | Argentina | 0.292 | 58.47 | |
| – | Alison Sánchez | Bolivia | 0.234 | DSQ | $^†$ |

$^†:$ Alison Sánchez from Bolivia was initially 7th in 56.60, but was disqualified, because she was tested positive for nandrolone.

