| Sectors | Splits | Cumulative | Strides | Lead leg |
|---|---|---|---|---|
| Start - H1 | 5.92 | 5.92 | 20 | G |
| H2 | 3.80 | 9.72 | 13 | G |
| H3 | 3.93(+0.13) | 13.65 | 13 | G |
| H4 | 4.07(+0.14) | 17.72 | 13 | G |
| H5 | 4.20(+0.13) | 21.92 | 13 | G |
| H6 | 4.30(+0.10) | 26.22 | 14 | D |
| H7 | 4.37(+0.07) | 30.59 | 14 | G |
| H8 | 4.40(+0.03) | 34.99 | 14 | D |
| H9 | 4.67(+0.27) | 39.66 | 15 | D |
| H10 | 4.57(-0.10) | 44.23 | 15 | D |
| Finish | 4.97 | 49.20 | — | — |
Total time
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.
Stride count and lead leg, hurdle by hurdle
Percentile position, sector by sector
Faster than 18% of 400m hurdles Elite-level.
Actual percentile: 18
n = 155 races · 76 athletes
Position within the pacing-consistency distribution (a higher value isn't necessarily a better race).
Position within the speed-loss distribution between the two race halves (a low value isn't always better pacing).
Hurdle fault rate, compared to the database.
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 28% Europe ranking.