On 12 July 2026, Grace Claxton (Puerto Rico) ran their 400 metres hurdles in 55.15 seconds at Edmonton (Edmonton Meeting).
| 19.47 |
| 8.01 |
15 R |
R |
| H5 | 4.63(+0.26) | 24.10 | 7.56 | 16 L | L |
| H6 | 4.77(+0.14) | 28.87 | 7.34 | 16 R | R |
| H7 | 4.83(+0.06) | 33.70 | 7.25 | 16 L | L |
| H8 | 5.03(+0.20) | 38.73 | 6.96 | 17 L | L |
| H9 | 5.20(+0.17) | 43.93 | 6.73 | 17 L | L |
| H10 | 5.23(+0.03) | 49.16 | 6.69 | 17 L | L |
| Finish | 5.99 | 55.15 | 6.68 | — — | — |
Avg. interval
4.74s
Std. deviation
0.34
Deceleration
Stride pattern
Fastest interval: 4.3s (H3–H4).
Excellent fatigue resistance: only 9.8% speed loss between the first and second halves (7.68 → 6.92 m/s).
Stutter on H8.
Lead leg alternation: 6× Left, 4× Right.