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Protocols / SJ

power · sagittal · 7s model

Squat Jump

Concentric-only lower-limb power. Contrast with CMJ to estimate eccentric utilisation (EUR).

Run in Capture Lab

Setup

  • Hold a static squat ~3 s (no dip), then jump
  • Hands on hips
  • Same landing constraints as CMJ

Scoring rubric

  • No unweighting before propulsion (true SJ)
  • Jump height typically 5–15% below CMJ in trained subjects
  • EUR = CMJ / SJ; < 1.0 suggests a strategy problem, not just strength

Literature

McGuigan et al. 2006 — eccentric utilisation ratio.

Tracked joints: hip, knee, COM. The kinematic engine is a teaching model scaled to the active subject. Export CSV from the report for your own processing.