On 18 July 2026, Kristen Colly (France) ran their 400 metres hurdles in 51.00 seconds at Paris, Charléty (France Championships U20).
| 18.00 |
| 8.73 |
14 L |
L |
| H5 | 4.08(+0.07) | 22.08 | 8.58 | 14 R | R |
| H6 | 4.28(+0.20) | 26.36 | 8.18 | 14 L | L |
| H7 | 4.48(+0.20) | 30.84 | 7.81 | 14 R | R |
| H8 | 4.64(+0.16) | 35.48 | 7.54 | 15 R | R |
| H9 | 4.78(+0.14) | 40.26 | 7.32 | 15 R | R |
| H10 | 5.11(+0.33) | 45.37 | 6.85 | 16 L | L |
| Finish | 5.63 | 51.00 | 7.10 | — — | — |
Avg. interval
4.36s
Std. deviation
0.39
Deceleration
Stride pattern
Fastest interval: 3.93s (H2–H3).
Deceleration of 11.3% between the first half (8.38 m/s) and the second half (7.43 m/s).
Steady stride pattern.
Lead leg alternation: 4× Left, 6× Right.