On 12 July 2026, Bianca Stubler (United States) ran their 400 metres hurdles in 55.14 seconds at Edmonton (Edmonton Meeting).
| 19.77 |
| 7.95 |
15 R |
R |
| H5 | 4.60(+0.20) | 24.37 | 7.61 | 15 R | R |
| H6 | 4.70(+0.10) | 29.07 | 7.45 | 15 R | R |
| H7 | 4.87(+0.17) | 33.94 | 7.19 | 15 R | R |
| H8 | 5.03(+0.16) | 38.97 | 6.96 | 16 L | L |
| H9 | 5.13(+0.10) | 44.10 | 6.82 | 16 R | R |
| H10 | 5.23(+0.10) | 49.33 | 6.69 | 16 L | L |
| Finish | 5.81 | 55.14 | 6.88 | — — | — |
Avg. interval
4.72s
Std. deviation
0.35
Deceleration
Stride pattern
Fastest interval: 4.23s (H2–H3).
Excellent fatigue resistance: only 8% speed loss between the first and second halves (7.59 → 6.99 m/s).
Steady stride pattern.
Lead leg alternation: 2× Left, 8× Right.