On 11 July 2026, Antonio John Forbes (Jamaica) ran their 400 metres hurdles in 50.43 seconds at Tlaxcala (North America Championships U23).
| 8.97 |
15 R |
R |
| H3 | 4.00(+0.10) | 14.07 | 8.75 | 15 R | R |
| H4 | 4.03(+0.03) | 18.10 | 8.68 | 15 R | R |
| H5 | 4.23(+0.20) | 22.33 | 8.27 | 15 R | R |
| H6 | 4.47(+0.24) | 26.80 | 7.83 | 15 R | R |
| H7 | 4.43(-0.04) | 31.23 | 7.90 | 15 R | R |
| H8 | 4.67(+0.24) | 35.90 | 7.49 | 15 R | R |
| H9 | 4.70(+0.03) | 40.60 | 7.45 | 15 R | R |
| H10 | 4.67(-0.03) | 45.27 | 7.49 | 15 R | R |
| Finish | 5.16 | 50.43 | 7.75 | — — | — |
Avg. interval
4.34s
Std. deviation
0.30
Deceleration
Stride pattern
Very consistent intervals (σ=0.3s).
Fastest interval: 3.9s (H2–H3).
Excellent fatigue resistance: only 7.6% speed loss between the first and second halves (8.28 → 7.65 m/s).
Stutter on H1.