sports science
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.
In-Season Groin Squeeze Force Monitoring: Catching Adductor Injury Risk Before It Becomes a Strain
A squeeze score can slide 15% for three straight weeks before anyone notices. Here's the weekly protocol and drop thresholds that catch it early.
Hip Labrum and FAI Return-to-Sport Benchmarks: Hip Flexion and Rotation Strength
Cleared on paper, unstable on a cut. Hip flexion and internal rotation strength plus a 45-degree pivot test are what standard charts miss. Full protocol inside.
Reconciling Laser/Doppler Sprint Speed With Timing Gates
Laser peak speed and timing-gate splits rarely match, and it is not a calibration error. The averaging math behind the gap, plus a field protocol to prove it.
Measuring the Nordic Hamstring Break-Point Angle: Protocol, Norms, and What It Predicts
Peak force on a NordBord misses who is actually at risk. Measure break-point angle instead: the exact knee angle where eccentric control fails.
Pole Vault Runway Velocity Timing-Gate Protocol: Measuring the Final Six Strides
Pole vault runway speed timing usually means one flying gate near the box. A stride-by-stride protocol for the last six strides catches what that average hides.
Setting Up a Reactive Agility Test With Light Gates
Most agility tests never make an athlete decide anything. Here's the light-gate layout, stimulus timing, and scoring that isolates decision speed.
Rugby Scrum Push Force Measurement: A Scrum-Machine Load-Cell Protocol for Peak vs Sustained Force
A scrum machine reading one number hides the real story. Split engagement peak from sustained push force with a load-cell protocol, ratios, and cutoffs.
Star Excursion Balance Test: Protocol and Normalizing Reach Distance to Limb Length
A taller athlete's raw SEBT reach looks better on paper, until you normalize to limb length. Full 8-direction protocol, the math, and injury-risk cutoffs.
505 Change of Direction Test: Full Protocol and Norms by Sport
Most 505 test setups add 0.1s of error before the athlete even runs. Exact gate distances, timing rules, and norms tables by sport and level.
Braking Force and Deceleration Field Test Protocol: Equipment, Steps, and Cutoffs
Sprint speed gets tested every combine day. Braking rarely does. A low-cost field protocol to quantify horizontal braking force, with cutoffs and math.
Concussion Baseline Balance Testing Protocol: Equipment, Steps, and Return-to-Play Cutoffs
Team norms miss individual deficits. A preseason BESS baseline protocol with scoring steps, the practice-effect fix, and return-to-play interpretation.