Test Protocols
Countermovement Jump (CMJ)
Section titled “Countermovement Jump (CMJ)”The most common jump test. The athlete starts standing, dips (countermovement), then jumps maximally.
| Parameter | Value |
|---|---|
| Duration | ~10 s |
| Auto-stop | Yes — force returns to near-zero after landing |
| Key metrics | Jump height, peak force, impulse, RSI-mod |
How to run: Athlete stands still for 2 s, then performs a maximal CMJ with hands on hips. Land on both feet.
What to look for: The dip relative to bodyweight is the eccentric phase. The force spike above bodyweight is the concentric drive.
Squat Jump (SJ)
Section titled “Squat Jump (SJ)”A jump from a static squat position — no countermovement. Measures pure concentric power.
| Parameter | Value |
|---|---|
| Duration | ~8 s |
| Auto-stop | Yes |
| Key metrics | Jump height, concentric impulse, peak force |
How to run: Athlete holds a ~90° squat for 3 s (static hold), then jumps without any dipping motion. The app detects and flags a countermovement if present.
Drop Jump (DJ)
Section titled “Drop Jump (DJ)”The athlete drops from a box, contacts the plate briefly, and immediately rebounds upward. Measures reactive strength.
| Parameter | Value |
|---|---|
| Duration | ~5 s |
| Auto-stop | Yes |
| Key metrics | Contact time, flight time, RSI (flight/contact), jump height |
How to run: Athlete steps off (not jumps off) a box of standard height (30 or 40 cm). Aim for minimal contact time and maximal jump height.
Isometric Mid-Thigh Pull (IMTP)
Section titled “Isometric Mid-Thigh Pull (IMTP)”Maximal isometric pull against a fixed bar. Measures peak strength and rate of force development.
| Parameter | Value |
|---|---|
| Duration | 8–10 s |
| Auto-stop | No — operator stops manually |
| Key metrics | Peak force, RFD (0–50 ms, 0–100 ms, 0–200 ms), impulse |
How to run: Set bar height at mid-thigh. Athlete pulls maximally for 3–5 s, then releases. Three trials with 2–3 min rest.
Balance / Postural Sway
Section titled “Balance / Postural Sway”Quiet standing assessment. Measures centre-of-pressure displacement and sway area.
| Parameter | Value |
|---|---|
| Duration | 30–60 s |
| Auto-stop | No |
| Key metrics | Sway area, ML/AP range, 95% ellipse area |
How to run: Athlete stands still, eyes open or closed. Run separate trials for each condition.
Other / Custom
Section titled “Other / Custom”For protocols not listed above, use Other and set a manual duration. The full 1000 Hz force-time trace is saved and available in Hootuo Hub for manual analysis.