drop jump
Fixing Contact-Time Threshold Misdetection in Reactive Jump Tests
A force or accel threshold set too high shortens ground contact time and inflates RSI; set too low, it does the opposite. Here's how to find the right value.
RSI Inflated by Short Contact Time: How to Find and Fix the Measurement Error
A drop jump reads RSI 3.1 with a 0.09s ground contact time that felt nothing like a stiff bounce. Here's why timing-gate error inflates RSI and how to retest.
Selecting Drop Height with the Reactive Strength Ratio
Most athletes drop jump from a height picked by eyeballing a box. Use the reactive strength ratio and a short testing ladder to find yours instead.
How to Test Drop Jump RSI with an IMU: A Standardized Protocol and Interpretation Guide
A standardized drop jump RSI testing protocol using an 800Hz IMU. Box height selection, warm-up, execution, and data interpretation explained step.
How to Test Leg Spring Stiffness: Hopping and Drop Jump IMU Protocols
Leg spring stiffness (Kleg) is the core SSC efficiency metric. A step-by-step 800Hz IMU protocol for hopping and drop jump testing and interpretation.
How to Test Reactive Strength Index (RSI): A Precision IMU Protocol
Measure reactive strength index (RSI) with an 800Hz IMU. Includes drop jump vs RSImod comparison and interpretation thresholds.
How to Use RSI for Plyometric Readiness: Drop Jump Assessment Guide
Struggling to judge plyometric readiness by feel? Use drop-jump RSI scores to set thresholds, find your optimal drop height, and gate session intensity.
How to Design a Plyometric Program: Science-Based Blueprint
Too many foot contacts too soon causes tendon pain, not power. Get the volume tables, exercise order by phase, and the RSI tracking that keeps it safe.
How to Test Reactive Strength Index: Complete Protocol Guide
Three ways to test reactive strength index: a contact mat, an IMU sensor, or a force plate, plus norms, thresholds, and coaching cues to use the number.