On 30 June 2026, Samantha Amador (Mexico) ran their 400 metres hurdles in 56.07 seconds at Montréal (Montréal Meeting).
| 20.00 |
| 7.64 |
15 L |
L |
| H5 | 4.57(-0.01) | 24.57 | 7.66 | 15 L | L |
| H6 | 4.81(+0.24) | 29.38 | 7.28 | 16 R | R |
| H7 | 4.91(+0.10) | 34.29 | 7.13 | 16 L | L |
| H8 | 5.14(+0.23) | 39.43 | 6.81 | 17 L | L |
| H9 | 5.33(+0.19) | 44.76 | 6.57 | 17 L | L |
| H10 | 5.27(-0.06) | 50.03 | 6.64 | 17 L | L |
| Finish | 6.04 | 56.07 | 6.62 | — — | — |
Avg. interval
4.81s
Std. deviation
0.36
Deceleration
Stride pattern
Fastest interval: 4.31s (H2–H3).
Excellent fatigue resistance: only 9.4% speed loss between the first and second halves (7.53 → 6.83 m/s).
Steady stride pattern.
Lead leg alternation: 9× Left, 1× Right.