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Our purpose was to investigate the immediate and prolonged effects of hamstrings fatigue on quadriceps neuromuscular function in individuals with anterior cruciate ligament reconstruction (ACLR) and matched uninjured controls.

Cross-Sectional.

Laboratory.

16 participants with a history of ACLR and 16 uninjured controls.

Quadriceps peak torque (PT), central activation ratio (CAR), early (RTD₁₀₀) and late (RTD₂₀₀) rate of torque development, vastus medialis and lateralis electromyographic (EMG) activity, and hamstrings-to-quadriceps co-activation assessed at baseline. Outcomes were evaluated pre-fatigue (PRE), immediately post-fatigue (POST), and 30min post-fatigue (POST30). The involved limbs of individuals with ACLR were assessed and control limbs were matched based on limb dominance.

Individuals with ACLR demonstrated lesser …