| Sectors | Splits | Cumulative | Strides | Lead leg |
|---|---|---|---|---|
| Start - H1 | 5.92 | 5.92 | 21 | G |
| H2 | 3.80 | 9.72 | 13 | G |
| H3 | 3.83(+0.03) | 13.55 | 13 | G |
| H4 | 3.95(+0.12) | 17.50 | 13 | G |
| H5 | 4.05(+0.10) | 21.55 | 13 | G |
| H6 | 4.29(+0.24) | 25.84 | 14 | D |
| H7 | 4.29(0.00) | 30.13 | 14 | G |
| H8 | 4.41(+0.12) | 34.54 | 15 | G |
| H9 | 4.26(-0.15) | 38.80 | 15 | G |
| H10 | 4.41(+0.15) | 43.21 | 15 | G |
| Finish | 5.32 | 48.53 | — | — |
Total time
Avg. interval
4.14s
Std. deviation
0.23
Deceleration
Stride pattern
New personal best!
Very consistent intervals (σ=0.23s).
Fastest interval: 3.8s (H2–H3).
Excellent fatigue resistance: only 7.2% speed loss between the first and second halves (8.58 → 7.97 m/s).
Steady stride pattern.
Hurdle fault on H5.
Lead leg alternation: 9× Left, 1× Right.
Stride count and lead leg, hurdle by hurdle
Percentile position, sector by sector
Faster than 30% of Elite-level races.
n = 105 races
Position within the pacing-consistency distribution (a higher value isn't necessarily a better race).
Position within the speed-loss distribution between the two race halves (a low value isn't always better pacing).
Hurdle fault rate, compared to the database.
On 26 July 2026, James Smith II (United States) ran their 400 metres hurdles in 48.53 seconds at New York (United States Championships). It's also their new personal best.
Source: https://results.usatf.org