On 18 July 2026, Caleb Dean (United States) ran their 400 metres hurdles in 50.45 seconds at Londres (Diamond League).
| 17.22 |
| 9.59 |
13 R |
R |
| H5 | 3.83(+0.18) | 21.05 | 9.14 | 13 R | R |
| H6 | 4.05(+0.22) | 25.10 | 8.64 | 13 R | R |
| H7 | 4.17(+0.12) | 29.27 | 8.39 | 13 R | R |
| H8 | 4.47(+0.30) | 33.74 | 7.83 | 14 L | L |
| H9 | 4.77(+0.30) | 38.51 | 7.34 | 15 L | L |
| H10 | 4.85(+0.08) | 43.36 | 7.22 | 16 R | R |
| Finish | 7.09 | 50.45 | 5.64 | — — | — |
Avg. interval
4.16s
Std. deviation
0.42
Deceleration
Stride pattern
Fastest interval: 3.65s (H4–H5).
High deceleration: 16.8% speed loss in the second half (8.79 → 7.31 m/s), to work on with speed endurance.
Stride count too high on hurdle intervals: H10, indicating fatigue or a technical imbalance.
Stutter on H10.
Hurdle fault on H8, H10.
Lead leg alternation: 3× Left, 7× Right.
All-time fastest sectors
All-time slowest sectors
Max speed
9.59m/s
Avg speed
7.93m/s
Std. deviation
0.42s