On 3 August 2025, Alastair Chalmers (United Kingdom) ran their 400 metres hurdles in 49.20 seconds at Birmingham (United Kingdom Championships).
On 4h/world, this time earns Alastair a Top 26% Europe ranking.
| 17.72 |
| 8.60 |
13 L |
L |
| H5 | 4.20(+0.13) | 21.92 | 8.33 | 13 L | L |
| H6 | 4.30(+0.10) | 26.22 | 8.14 | 14 R | R |
| H7 | 4.37(+0.07) | 30.59 | 8.01 | 14 L | L |
| H8 | 4.40(+0.03) | 34.99 | 7.95 | 14 R | R |
| H9 | 4.67(+0.27) | 39.66 | 7.49 | 15 R | R |
| H10 | 4.57(-0.10) | 44.23 | 7.66 | 15 R | R |
| Finish | 4.97 | 49.20 | 8.05 | — — | — |
Avg. interval
4.26s
Std. deviation
0.27
Deceleration
Stride pattern
Very consistent intervals (σ=0.27s).
Fastest interval: 3.8s (H2–H3).
Excellent fatigue resistance: only 6.6% speed loss between the first and second halves (8.44 → 7.88 m/s).
Steady stride pattern.
Lead leg alternation: 6× Left, 4× Right.
All-time fastest sectors
All-time slowest sectors