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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Olga Nazarova | URS | 49.11 |
| 2 | Petra Mueller | GDR | 49.50 |
| 3 | Diane Dixon | USA | 49.84 |
| 4 | Denean Howard | USA | 49.87 |
| 5 | Jillian Richardson | CAN | 49.91 |
| 6 | Ute Thimm | FRG | 50.28 |
| 7 | Marita Payne Wiggins | CAN | 50.29 |
| 8 | Dagmar Neubauer | GDR | 50.92 |
| Rank | Name | Nation | Time |
| 1 | Olga Bryzgina | URS | 49.33 |
| 2 | Valerie Brisco | USA | 49.90 |
| 3 | Maree Holland | AUS | 50.24 |
| 4 | Helga Arendt | FRG | 50.36 |
| 5 | Kirsten Emmelmann | GDR | 50.39 |
| 6 | Cathy Rattray-Williams | JAM | 50.82 |
| 7 | Charmaine Crooks | CAN | 51.63 |
| 8 | Norfalia Carabali | COL | 52.65 |