Pole Vault Runway Velocity Timing-Gate Protocol: Measuring the Final Six Strides

A vaulter walks into the box early three meets running, plants a half-step short, and clips the bar with a knee that never fully turns over. The coach pulls that day's flying-10m split off the testing sheet and it reads exactly where it has read all season, right in the range that used to correlate with clean vaults. So the number says the approach is fine. The film says otherwise: frame by frame, the last two strides before the plant get visibly shorter, ground contacts quicken and stiffen, and the hips drop a fraction of a second before the pole ever loads against the box. A single gate averaged over the last 5 or 10 meters of the runway cannot see any of that. It hands back one number for a phase of the run where velocity is very often not constant at all, and that averaging happens to land on exactly the stretch of runway that decides whether the vault works.

That is the case for testing the final six strides as their own segment instead of folding them into one flying split. Six strides is enough runway to see a trend rather than a single noisy number, short enough that stride length and ground contact time do not drift the way they do earlier in the approach, and it lines up with where most technical breakdowns at the plant actually start. What follows is the equipment, the marking method, the math for turning split times into a stride-by-stride curve, and the reference bands for reading what that curve says about a vaulter's plant.

Why One Flying Gate Near the Board Hides the Real Problem

Most runway testing borrows straight from sprint testing: a laser or a pair of photocell gates set 5 or 10 meters out from the box, one time, one average velocity. That number is genuinely useful for tracking whether an athlete's overall approach speed is trending up across a training block. It is close to useless for diagnosing why a fast vaulter keeps missing the plant, because an average smooths over exactly the pattern that matters most, which is whether velocity is rising, holding, or falling through the strides where the athlete has to find the box, load the pole, and leave the ground.

A vaulter can post a strong flying-10m number while decelerating hard through the last two strides, because the earlier strides in that window were fast enough to drag the average up. Coaches see this mismatch on video constantly: the sheet says the approach is fine, the tape shows a check-and-chop pattern in the final two ground contacts that any hurdler would recognize as a stutter step. Splitting the last six strides into individual intervals turns that invisible pattern into six numbers a coach can actually read.

Marking the Runway and Setting Up the Gate Array

This has to run on the vaulter's actual competition runway, with the pole carried, not on a bare sprint lane. Pole carriage changes arm mechanics and, for most vaulters, shortens stride length slightly compared to an unloaded sprint, so a clean lane test will not reproduce the same last-six-strides pattern that shows up on the runway.

Stride length is individual, so do not mark six strides at a fixed distance for every athlete. Find each vaulter's actual foot-strike points from video first, on at least two run-throughs, then place flags or gates at those specific spots. For elite men this window typically spans somewhere in the 11-14m range before the plant; for elite women it tends to run closer to 9-11m, though both vary meaningfully with individual stride pattern and should be confirmed on video rather than assumed.

Step-by-Step Protocol

1. Warm-up and calibration runs (15-20 minutes): Standard warm-up, then 2-3 full approach run-throughs with the pole, without jumping, filmed from the side to identify the last six foot-strike points for this athlete on this day. Check marks can shift slightly session to session with fatigue and weather, so re-confirm rather than reusing last week's flags.
2. Place the gate array: Mark or place gates at each of the identified foot-strike points, giving seven markers that bound six stride intervals, the last one ending at the plant step.
3. Run trials: 4-6 near-maximal approach trials with the pole carried, ideally finishing into an actual vault over a manageable bar height rather than a run-through, since the presence of a real bar changes commitment through the last strides in a way a run-through does not.
4. Valid trial criteria: Discard any trial where the vaulter visibly adjusts stride pattern mid-approach to find a check mark, since that is a different problem from a smooth approach that simply decelerates.
5. Capture the data: Record time between each pair of markers for every valid trial, convert to velocity per stride interval, and log wind and runway surface alongside it.
6. Scoring: Use the trial with the highest velocity in strides 6 through 4 as the reference trial, then evaluate the shape of the full six-stride curve on that trial rather than cherry-picking whichever single interval looks best.

Budget 20-25 minutes per athlete once calibration is done, and expect the calibration step to take longer the first time you run this with a given vaulter. After that, foot-strike points tend to stay stable within about 10-15cm session to session for an athlete with a consistent approach.

Turning Split Times Into a Stride-by-Stride Velocity Profile

Each stride interval gets its own velocity: V(n) = d(n) / t(n), where d(n) is the distance between two consecutive foot-strike markers and t(n) is the time between them. From there, two numbers do the actual diagnostic work.

Interstride change: %Δ = (V(n) − V(n−1)) / V(n−1) × 100, calculated between each consecutive pair of strides. A negative value flags deceleration for that specific stride transition rather than for the window as a whole.

Final-strides retention: Retention = V(last) / V(peak) × 100, where V(peak) is the highest velocity recorded anywhere in the six-stride window (usually stride 6, the earliest one) and V(last) is the velocity of the final stride into the plant. This single percentage is what goes into the reference bands below.

Worked example, elite male vaulter, best trial of the session:

Strides 6 through 3 barely move, each losing less than a percent against the one before it, which is what a smooth carry into the box looks like on paper. Strides 2 and 1 tell a different story: an 5.6% drop followed by a 7.4% drop, back to back, which is the numeric signature of a check-and-chop pattern rather than gradual, expected fatigue. Retention here works out to 8.05 / 9.38 × 100, or 85.8%, low enough to flag for a technical look at the plant rather than a conditioning fix.

What the Research Says About Velocity Loss Before Takeoff

Angulo-Kinzler, Kinzler, Balius, Turró, Caubet, Escoda, and Prat (1994), publishing in the Journal of Applied Biomechanics, filmed elite vaulters at a major championship and tracked horizontal velocity across the final meters of the runway rather than relying on a single average split. They reported a strong relationship between velocity measured close to takeoff and vault height, and, notably, documented a measurable velocity decrease through the final strides in most of the vaulters they tracked, including several finalists, with the size of that drop varying enough between athletes to separate cleaner technical approaches from less efficient ones at similar overall speeds. Their own stated limitation is worth carrying forward directly: the sample was a single championship field, filmed with panning video rather than fixed high-speed cameras, which limits how precisely instantaneous stride-to-stride velocity can be resolved compared to gate- or IMU-based capture.

Frère, L'Hermette, Slawinski, and Tourny-Chollet (2010), reviewing pole vault mechanics for Sports Biomechanics, consolidated findings across several championship-level kinematic studies and reported elite men's horizontal takeoff velocity typically falling in the 9.0-9.5 m/s range, with elite women generally lower. More directly relevant here, the review identified maintaining velocity through the last two strides, avoiding the shortened, quickened pattern often called a chop, as one of the more consistent technical differences between higher- and lower-placing vaulters even at similar overall approach speed. The review's flagged limitation applies to this protocol too: most of the underlying studies used manual video digitization over a constrained capture volume, so the last-stride measurements it draws on carry more error than a wearable-sensor or multi-gate setup run under controlled conditions would produce today.

Reading a Final-Six-Strides Profile

These bands describe final-strides retention, the percentage the last stride holds relative to the fastest stride in the six-stride window, and are meant as a starting reference for flagging a plant worth reviewing on video, not a strict pass-fail cutoff.

The shape of the curve matters as much as the final number. A gradual decline spread evenly across all six strides is a different problem, and usually a smaller one, than the same total retention loss concentrated entirely in strides 2 and 1. The worked example above lands at 85.8% retention with almost all of the loss packed into the last two strides, which points specifically at the plant sequence rather than general approach fitness.

Mistakes That Wreck a Stride-by-Stride Reading

What to Do When the Final Strides Show a Drop

A retention score in the notable-loss or major-loss band is a cue to go back to the video for the specific two strides flagged, not a signal to add more general sprint conditioning. Most drops this sharp trace back to one of two habits: the vaulter reaching for a check mark that is slightly off that day and shortening a stride to hit it, or a late pole drop that forces the plant foot to decelerate to stay under the top hand. Both show up clearly once a coach knows which exact stride to watch for, which is the whole point of testing six strides instead of one average.

For the check-mark pattern, drilling the approach from a shortened, marked start point with the sole goal of hitting the last two check marks cleanly, without a bar at all, tends to rebuild rhythm faster than full-runway repetitions. For a late pole drop, cueing the drop earlier relative to a fixed stride count, then re-testing the same six-stride window a session or two later, shows directly whether the cue closed the gap. Retest every 1-2 weeks during a technical focus block; because check marks shift with fatigue and weather, a single session's curve is a data point, not a verdict, and the trend across several sessions is what actually tells a coach whether the fix is working.