See every stride before
the stopwatch does.
Sprint 4D turns a single non-contact laser beam into a full kinematic profile of a sprint — continuous velocity, acceleration, phase timing and step-by-step technique, processed and ready before the athlete has cooled down.
From raw beam data to a session report, automatically.
Sprint 4D covers the entire pipeline — cleaning, smoothing, and interpreting laser distance data — so the numbers a coach sees are the ones that actually describe the run.
Live capture & cleanup
Import raw LDM data straight from the base station, auto-trim the idle time before the gun and after the finish, and flag dropout frames caused by arm swing or a lost beam.
Adaptive smoothing
A dual-pass moving-average filter separates the step-to-step oscillation of the body from the athlete's absolute running speed — tunable per athlete, per session.
Automatic phase breakdown
Every run is split into acceleration, maximum-velocity and deceleration phases, with a configurable %-of-Vmax window so it adapts to sprinters of any level.
Step-by-step kinematics
Step length, step frequency and contact-to-contact cycle time, calculated from every individual push-off peak — not just an average over the full distance.
Zones, gates & splits
Drop virtual timing gates anywhere on the track and instantly get split time, average speed and peak speed for that section — no extra hardware required.
Reports coaches actually read
One-click PDF, CSV or XLSX export with graphs, phase tables and session notes — on the trackside laptop, ready before the athlete leaves the track.
Four steps between the tripod and the report.
The measurement itself takes less time to set up than a set of blocks — the athlete runs exactly as they would on race day.
Set the beam
Mount the LDM-301 on a stable tripod 5–10 m behind the start line, aimed at the athlete's lumbar spine — level with the centre of mass.
Calibrate the line
A 3-second reading against a reference bar on the start line fixes the exact calibration distance before a single sprint is run.
Run the sprint
The laser tracks continuously at 100 Hz from start to finish. No sensors on the body, no interruption to the start action.
Read the result
Sprint 4D imports, cleans, smooths and analyses the file automatically — velocity, phases, splits and step data, in under a minute.
Sprint 4D is built around the LDM-301 laser.
A single infrared laser distance meter, pointed at the small of the athlete's back, is all the hardware a session needs.
| Measuring range | 0.5 – 300 m |
| Accuracy | ± 20 mm |
| Measurement interval | 0.5 ms, optional 0.1 ms |
| Speed range | 0 – 100 m/s |
| Measuring laser | 905 nm infrared · Class 1 (eye-safe) |
| Pilot laser | 650 nm visible red · Class 2 |
| Beam divergence | 1.7 mrad average spread |
| Interface | RS232 / RS422 |
| Operating temperature | −40 °C to +60 °C |
| Weight | 800 g, with housing |
Built in a biomechanics lab, not a garage.
Sprint 4D grew out of laser sprint-diagnostics research developed and tested with a top sport university's biomechanics program, and published in peer-reviewed literature.
"The efficiency and running economy can be calculated with various time, speed, acceleration and length indexes… using the laser measurement method and detailed kinematic analysis may constitute a new chapter in measuring speed."
— Štuhec, Planjšek, Ptak, Čoh & Mackala, Sensors (MDPI), 2022Across repeated static and running trials, the laser method held an absolute error under 0.05% at distances up to 70 m — around 5–10 cm over a full 100 m sprint once the signal is smoothed and cleaned.
Independent comparisons against high-speed video kinematic analysis found equivalent accuracy, while offering far faster processing — results are ready for the coach at trackside, not days later in a lab.
| Method | Accuracy | Data richness | Setup cost |
|---|---|---|---|
| Handheld stopwatch | |||
| Photocell gates | |||
| Optojump contact mats | |||
| High-speed video kinematics | |||
| Sprint 4D + LDM-301 |
Bring Sprint 4D to your track.
Request a live demo with your own athletes, or send us a question — we usually reply within one working day.
Request a demo
Tell us a little about your setup and we'll bring an LDM-301 unit to your session.
Company
Sportis, Sports Information Systems
Ljubljana, Slovenia