On 11 July 2026, Romario Stewart (Jamaica) ran their 400 metres hurdles in 50.21 seconds at Tlaxcala (North America Championships U23).
| 18.06 |
| 8.47 |
14 L |
L |
| H5 | 4.17(+0.04) | 22.23 | 8.39 | 14 R | R |
| H6 | 4.43(+0.26) | 26.66 | 7.90 | 14 L | L |
| H7 | 4.40(-0.03) | 31.06 | 7.95 | 14 R | R |
| H8 | 4.57(+0.17) | 35.63 | 7.66 | 14 L | L |
| H9 | 4.67(+0.10) | 40.30 | 7.49 | 15 L | L |
| H10 | 4.73(+0.06) | 45.03 | 7.40 | 15 L | L |
| Finish | 5.18 | 50.21 | 7.72 | — — | — |
Avg. interval
4.33s
Std. deviation
0.28
Deceleration
Stride pattern
Very consistent intervals (σ=0.28s).
Fastest interval: 3.9s (H2–H3).
Excellent fatigue resistance: only 7.7% speed loss between the first and second halves (8.32 → 7.68 m/s).
Steady stride pattern.
Hurdle fault on H9.
Lead leg alternation: 6× Left, 4× Right.