research
Hamstring-to-Quadriceps Isokinetic Ratio Test: Reading Injury Risk Beyond the Sprint Score
A H:Q ratio under 0.47 or a 15% bilateral gap flags real hamstring injury risk on isokinetic testing. Here is the full protocol, norms, and interpretation.
Smallest Worthwhile Change: Reading Real Shifts in Athlete Tests
A 1.4cm CMJ gain can be noise or a real improvement depending on your test's typical error. Worked SWC and TE calculations coaches can copy this week.
Tethered Swim Force Test: Validity, Setup, and Interpretation
A fixed rope and load cell measure real propulsive force in the water, not a land proxy. The rig, protocol, and force ranges that actually hold up.
Why Golf Clubhead Speed Numbers Differ on Mats vs. Grass: Reading Lie, Bounce, and Light Correctly
A 4 mph gap between the mat and the range usually isn't your swing decaying. It's bounce-turf interaction, contact point, and indoor light moving the number.
Morning Priming Sessions Before Competition: Evidence Review
Two controlled studies test whether a morning priming session before competition raises afternoon power and readiness, plus the exact protocol.
Neck Strength and Concussion Risk: What Studies Show
Coaches ask if neck exercises stop concussions. A 6,704-athlete study found 5% lower odds per pound of strength - here's what it does and doesn't prove.
Weightlifting Shoes and Heel Elevation: Squat Biomechanics Research
Struggling to keep your heels down and torso upright in the squat? Three motion-capture studies show what a 19mm heel wedge changes, and who it actually helps.
Contrast Training Research Review: Heavy + Explosive Pairings for Power
Pairing heavy squats with jumps only works if the rest between them is right. This review covers the PAP mechanism, optimal timing, and what VBT confirms.
Tendon Stiffness and Power Development: Research Review
Stiffer tendons transmit force faster, raising rate of force development and reactive strength. See which methods change stiffness, and how to measure it.
Why Deload Frequency Matters More Than Intensity: A VBT-Driven Research Review
Cutting intensity isn't the lever that matters most for recovery — deload frequency is. Six RCTs re-read through IMU and VBT data confirm it.
Why Rep-by-Rep Velocity Stabilization Matters: Reliability and Adaptation Signals in VBT
When rep-to-rep velocity variation drops below a 5% coefficient of variation, that is your sign neuromuscular adaptation is locking in, per 800Hz IMU data.
Why Couplet Training Saves Time: The Neurophysiology of Antagonist Supersets
Pairing antagonist exercises trims session time 47% while 1RM and power output hold steady — the neurophysiology and 800Hz IMU verification data.