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Summary
Heat 1
| Rank | Name | Nation | Time |
| 1 | Chandra Cheeseborough | USA | 50.94 |
| 2 | Charmaine Crooks | CAN | 52.04 |
| 3 | Ilrey Oliver | JAM | 52.19 |
| 4 | June Griffith | GUY | 52.27 |
| 5 | Heike Schulte-Mattler | FRG | 52.77 |
| 6 | Erica Rossi | ITA | 53.04 |
| 7 | Joycelyn Joseph | ANT | 53.63 |
| 8 | Zonia Meigham-Juarez | GUA | 55.64 |
| Rank | Name | Nation | Time |
| 1 | Gaby Bussmann | FRG | 52.42 |
| 2 | Kathy Cook | GBR | 52.64 |
| 3 | Molly Killingbeck | CAN | 52.77 |
| 4 | Cathy Rattray | JAM | 52.78 |
| 5 | Gail Emmanuel | TTO | 54.07 |
| 6 | Elanga Buala | PNG | 56.82 |
| 7 | Mercy Addy | GHA | 58.91 |
| Rank | Name | Nation | Time |
| 1 | Lillie Leatherwood | USA | 52.05 |
| 2 | Marita Payne | CAN | 52.89 |
| 3 | Helen Barnett | GBR | 52.94 |
| 4 | Marie Lande Mathieu | PUR | 53.27 |
| 5 | Emma Tahapari | INA | 55.82 |
| 6 | Realwadee Srithoa | THA | 58.11 |
| Rank | Name | Nation | Time |
| 1 | Valerie Brisco-Hooks | USA | 51.42 |
| 2 | Ruth Waithera | KEN | 52.53 |
| 3 | Ute Thimm | FRG | 52.53 |
| 4 | Michelle Scutt | GBR | 52.89 |
| 5 | Cynthia Green | JAM | 53.61 |
| 6 | Carlon Blackman | BAR | 54.26 |
| 7 | Zeina Mina | LBN | 59.56 |