On 18 July 2026, Alastair Chalmers (United Kingdom) ran their 400 metres hurdles in 48.81 seconds at Londres (Diamond League). It's also their new personal best.
On 4h/world, this time earns Alastair a Top 20% Europe ranking.
| 17.11 |
| 9.26 |
13 L |
L |
| H5 | 3.92(+0.14) | 21.03 | 8.93 | 13 L | L |
| H6 | 4.15(+0.23) | 25.18 | 8.43 | 13 L | L |
| H7 | 4.33(+0.18) | 29.51 | 8.08 | 14 R | R |
| H8 | 4.43(+0.10) | 33.94 | 7.90 | 14 L | L |
| H9 | 4.63(+0.20) | 38.57 | 7.56 | 15 L | L |
| H10 | 4.75(+0.12) | 43.32 | 7.37 | 15 L | L |
| Finish | 5.49 | 48.81 | 7.29 | — — | — |
Avg. interval
4.16s
Std. deviation
0.38
Deceleration
Stride pattern
New personal best!
Fastest interval: 3.67s (H2–H3).
Deceleration of 12% between the first half (8.8 m/s) and the second half (7.74 m/s).
Steady stride pattern.
Lead leg alternation: 9× Left, 1× Right.