Tru40 is a population-calibrated conversion that takes a single sprint split — a 10–20, 10–40, 10–60, or flying 10 — and predicts the athlete's equivalent full 40-yard dash time using the mono-exponential sprint model (Furusawa 1927; Samozino & Morin 2015–2016).
The model fits the athlete's maximum sprint speed (MSS) from one split using a population-typical acceleration profile (TAU/MSS ratio ≈ 0.081, calibrated from NFL Combine data, Clark et al. 2017). It's accurate across the 4.2–5.2 s range covering most field-sport athletes.
Use cases: a club without 40 yards of timing space can run flying-10s and still compare to 40-yard reference data; a coach can compare across athletes who tested with different protocols on different days; trend charts plot a consistent metric over time even when the underlying test changes.
Where it's used
Sprint testing where measuring the full 40 yards isn't practical, or where mixed splits across athletes need to be compared on one scale.
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