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Validation

STRIV next to two lab references: a Bertec force-plate treadmill and a Footscan pressure plate.

Bertec force-plate treadmill

Gold-standard validated.

Force-plate treadmills are the gold standard for measuring running forces in biomechanics labs. STRIV tracked the same changes as Bertec across ground reaction force (GRF), contact time, vertical average loading rate (VALR), loading time, and braking force.

Validated over 40,000 steps · 24 runners

How we tested

Runners changed speed on a Bertec force-plate treadmill. Each point averages 15 steps. Average change error compares changes from each recording’s usual level. BW means body weight; BW/s means body weights per second.

STRIV vs Bertec

Choose a measurement to see its average change error.

Average change error · lower is closer to the lab.

Selected signal

Peak vertical GRF

r = 0.975Average change error5% of body weight

Each dot is one running window. The closer the cloud follows the diagonal, the more closely STRIV follows Bertec.

Footscan pressure plate

Lab-plate pressure, inside the shoe.

We ran STRIV head to head with a Footscan pressure plate, the lab reference. Heel to toe, STRIV’s center of pressure follows the plate’s.

56 feet · 263 steps

STRIV insoleIn the shoe

Footscan plateLab reference

Lower Higher

Toe-off

Front to back

Side to side

STRIVFootscanCenter of pressure, each scaled to its own range

Same runner, same run, right foot in thin shoes. One typical stance from each device, slowed down on a shared stance clock. Colors show relative pressure within each device.

Correlation with Footscan

Front-to-back center of pressure: r0.98
Side-to-side center of pressure: r0.80
Pressure distribution, heel to toeShare of pressure across 7 equal zones: r0.84

56 feet, walking and running in own shoes, thin shoes and socks. Center of pressure uses the middle 80% of each stance and is scored on 263 steps after a quick 3-step alignment per foot that those steps never saw. Pressure distribution needs no alignment.

Lab-grade, in the shoe

See what changes, step by step.

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