On 26 July 2026, Sep De Jong (Netherlands) ran their 400 metres hurdles in 53.07 seconds at Hengelo (Netherlands Championships).
| 18.71 |
| 8.14 |
14 R |
R |
| H5 | 4.28(-0.02) | 22.99 | 8.18 | 14 L | L |
| H6 | 4.50(+0.22) | 27.49 | 7.78 | 14 R | R |
| H7 | 4.86(+0.36) | 32.35 | 7.20 | 15 R | R |
| H8 | 4.84(-0.02) | 37.19 | 7.23 | 15 R | R |
| H9 | 5.04(+0.20) | 42.23 | 6.94 | 16 L | L |
| H10 | 5.00(-0.04) | 47.23 | 7.00 | 15 L | L |
| Finish | 5.84 | 53.07 | 6.85 | — — | — |
Avg. interval
4.54s
Std. deviation
0.38
Deceleration
Stride pattern
Fastest interval: 4s (H2–H3).
Deceleration of 11.2% between the first half (8.05 m/s) and the second half (7.15 m/s).
Steady stride pattern.
Lead leg alternation: 5× Left, 5× Right.