On 18 August 2025, Alison Dos Santos (Brazil) ran their 400 metres hurdles in 46.84 seconds at Tokyo (World Championships).
On 4h/world, this time earns Alison a Top 2% World ranking.
| 16.70 |
| 9.41 |
12 L |
L |
| H5 | 3.88(+0.16) | 20.58 | 9.02 | 12 R | R |
| H6 | 3.92(+0.04) | 24.50 | 8.93 | 12 L | L |
| H7 | 4.08(+0.16) | 28.58 | 8.58 | 13 L | L |
| H8 | 4.24(+0.16) | 32.82 | 8.25 | 13 L | L |
| H9 | 4.32(+0.08) | 37.14 | 8.10 | 13 L | L |
| H10 | 4.56(+0.24) | 41.70 | 7.68 | 13 L | L |
| Finish | 5.14 | 46.84 | 7.78 | — — | — |
Avg. interval
4.00s
Std. deviation
0.31
Deceleration
Stride pattern
Fastest interval: 3.56s (H3–H4).
Excellent fatigue resistance: only 8.9% speed loss between the first and second halves (8.99 → 8.19 m/s).
Steady stride pattern.
Lead leg alternation: 8× Left, 2× Right.
Max speed
9.83m/s
Avg speed
8.54m/s
Std. deviation
0.31s