Squat Biomechanics: Moment Arms & Quadriceps Torques
By Strength & Exercise Physiology Review Board•
Physiology & Training Takeaway
Barbell squat biomechanics: analyzing femur length, ankle dorsiflexion, moment arms to the knee and hip joints, and maximizing vastus lateralis tension.
Torque around the knee and hip joints is a product of external load and the perpendicular distance (moment arm) from the line of gravity to each joint axis.
1. High-Bar vs. Low-Bar Mechanics
High-Bar Squat: More upright torso posture increases the knee moment arm, maximizing quadriceps tension and patellofemoral load.
Low-Bar Squat: Forward torso angle extends the hip moment arm, recruiting more gluteus maximus, adductor magnus, and hamstring musculature.
Heel Elevation & Wedges: Elevating the heel overcomes limited ankle dorsiflexion, allowing forward knee travel for deeper quad stretch under load.
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Strength & Exercise Physiology Review Board
Our editorial team includes CSCS certified strength and conditioning specialists, sports nutritionists, and biomechanists reviewing muscle protein synthesis trials, mTORC1 signaling pathways, and lifting torque mechanics.
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