Why does my hurdler fade in the back half of the race?
Clean hurdles early and a chopped, slowing stride pattern late is usually fatigue finding the exact technical fault good conditioning was hiding.
The first four or five hurdles look like the athlete you trained. Then something changes: a stutter step appears, the trail leg gets slow coming through, and each hurdle after that costs a little more time than the one before it. This pattern has a name coaches use loosely, dying, and a more specific cause underneath it.
What fatigue actually does over a hurdle
Clearing a hurdle well takes real strength through the hip and trunk to keep the stride pattern intact while running at speed. As that strength runs out, the things that were automatic early in the race, a flat trail leg, a quick trunk recovery, stop being automatic, and the body defaults to whatever is easiest, which is usually a higher, slower clearance with an extra half-step tucked in front of the barrier.
The two things that usually explain it
- A conditioning gap: the technical model was never wrong, the athlete just cannot hold it for the full distance yet, which shows up specifically in the 300 hurdles more than the 100 or 110.
- A technical model that was never automatic in the first place, so it survives at 90 percent effort in practice and falls apart under race fatigue and a slightly faster early pace.
Where the Film Room can separate the two
The hurdles setting reports trunk dip over the barrier, lead-leg extension, how far the hips rise at the hurdle, and overstride between barriers. Filmed on an early hurdle and a late one in the same race, those four numbers moving together, more dip, more hip rise, more overstride, point at fatigue changing the pattern rather than the pattern being wrong to begin with. If the late-hurdle numbers look almost identical to the early ones and the athlete is still visibly slower, the fade is more likely conditioning than technique.
A single 2D camera cannot tell you an athlete's fatigue level, heart rate or how hard the early pace actually was, and it cannot watch every hurdle in one frame: getting a fair early-versus-late comparison means filming two separate hurdles from the same spot and distance, not one long shot of the whole race. The numbers describe what changed. Whether that change is conditioning or nerves is still a coaching judgment.
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Related
Why does your hurdler take a different number of strides between each hurdle?
The step count between hurdles is a symptom, not the problem, and Film Room's overstride number usually moves before the pattern actually breaks.
Read →Why does your hurdler clear clean in practice and chop at meets?
The technique did not disappear between Tuesday and Saturday. The spacing, the pace into hurdle one, and the nerves did.
Read →Why your hurdler stutters before the hurdle
A chopped last stride is almost never a problem at the barrier. It is a problem three strides earlier.
Read →Try it: Hurdle technique analysis from video: trunk dip, lead leg, hip rise