On 17 August 2021, Alison Dos Santos (Brazil) ran their 400 metres hurdles in 46.72 seconds at Tokyo (Olympic Games).
On 4h/world, this time earns Alison a Top 2% World ranking.
| 16.82 |
| 9.51 |
12 R |
R |
| H5 | 3.84(+0.16) | 20.66 | 9.11 | 12 L | L |
| H6 | 4.08(+0.24) | 24.74 | 8.58 | 13 L | L |
| H7 | 4.12(+0.04) | 28.86 | 8.50 | 13 L | L |
| H8 | 4.20(+0.08) | 33.06 | 8.33 | 13 L | L |
| H9 | 4.28(+0.08) | 37.34 | 8.18 | 13 L | L |
| H10 | 4.32(+0.04) | 41.66 | 8.10 | 13 L | L |
| Finish | 5.06 | 46.72 | 7.91 | — — | — |
Avg. interval
3.98s
Std. deviation
0.26
Deceleration
Stride pattern
Very consistent intervals (σ=0.26s).
Fastest interval: 3.6s (H2–H3).
Excellent fatigue resistance: only 7.9% speed loss between the first and second halves (8.95 → 8.25 m/s).
Steady stride pattern.
Lead leg alternation: 9× Left, 1× Right.
All-time fastest sectors
All-time slowest sectors
Max speed
9.72m/s
Avg speed
8.56m/s
Std. deviation
0.26s