CMJ
Force-Plate CMJ Phase Identification Errors: How Unweighting, Braking and Propulsion Get Mislabeled
Braking RFD jumped 50% overnight? Your force plate likely mislabeled the braking-propulsion boundary. Fix CMJ phase identification errors before they skew data.
CMJ Depth Inconsistency Is Quietly Wrecking Your Power and RSI Comparisons
A few centimeters of extra dip changes peak power and RSImod more than fitness does. Here's how to standardize CMJ depth and stop chasing noise.
Fixing CMJ Eccentric-Concentric Phase Split Errors From Arm Swing and Unweighting Drift
CMJ phase detection error skews RSI and power output when arm swing or fast unweighting move the eccentric-concentric split. Here's how to catch and fix it.
CMJ Numbers Dropped But the Athlete Doesn't Feel Fatigued? Here's How to Read It
Your CMJ height fell 6% but the athlete feels fine. Check movement time and force development first, not jump height, to tell real fatigue from noise.
Abalakov Jump Test: Arm-Swing Vertical Jump Protocol
Step-by-step Abalakov jump test protocol, arm-swing technique cues, how it compares to a standard CMJ, and normative data by athlete level
RSI-Modified Explained: The Countermovement Jump Reactive Metric
Your CMJ height looks fine, but something's off in the timing. RSImod explains why — the formula, protocol, real research findings, and common testing errors.
VBT for ACL Return to Play: A Step-by-Step Velocity-Based Protocol
Bar velocity, CMJ limb symmetry, and velocity loss give objective return-to-play data after ACL reconstruction. Use them alongside surgeon clearance.
Neuromuscular Readiness: Daily CMJ Monitoring Evidence
Jump height alone misses fatigue that the Ft:Ct ratio catches early. This synthesis shows which CMJ metrics flag readiness and why stacking markers helps.
How to Improve Vertical Jump Height Fast: A 4-Week IMU-Based Program for +5cm Gains
This 4-week, IMU-measured jump program combines CMJ, drop jumps, and deployment jumps for an average +5cm gain, tracked at 800Hz — no guesswork needed.
Why CMJ Outperforms SJ for Daily Athlete Monitoring: A Neuromuscular Fatigue Comparison
Squat jump misses what countermovement jump catches. CMJ tracks neuromuscular fatigue 2.3x more sensitively, per longitudinal IMU monitoring evidence.
Why Knee Flexion Angle Determines Jump Height: Biomechanical Analysis of Countermovement Depth
Knee flexion angle in the countermovement jump shifts jump height more than most realize. Here's the optimal depth range and why it varies by athlete.
Why Warmup Jumps Predict Performance: The Science of Neuromuscular Readiness
A flat warmup jump can be an early warning sign. RSI and jump-height shifts during warmup forecast same-day performance via 800Hz IMU tracking.