On 18 July 2026, Lucien Cornebois (France) ran their 400 metres hurdles in 54.33 seconds at Paris, Charléty (France Championships U23).
| 18.12 |
| 8.68 |
14 R |
R |
| H5 | 4.13(+0.10) | 22.25 | 8.47 | 14 L | L |
| H6 | 4.20(+0.07) | 26.45 | 8.33 | 15 L | L |
| H7 | 4.33(+0.13) | 30.78 | 8.08 | 15 L | L |
| H8 | 4.51(+0.18) | 35.29 | 7.76 | 15 L | L |
| H9 | 4.71(+0.20) | 40.00 | 7.43 | 15 L | L |
| H10 | 5.05(+0.34) | 45.05 | 6.93 | 16 R | R |
| Finish | 9.28 | 54.33 | 4.31 | — — | — |
Avg. interval
4.32s
Std. deviation
0.35
Deceleration
Stride pattern
Fastest interval: 3.9s (H2–H3).
High deceleration: 19.4% speed loss in the second half (8.31 → 6.7 m/s), to work on with speed endurance.
Steady stride pattern.
Hurdle fault on H10.
Lead leg alternation: 7× Left, 3× Right.