Different Effect of Local and General Fatigue on Knee Joint Stiffness.

Purpose: To investigate the influence of locally and generally induced fatigue on the stiffness properties of the knee joint. Methods: Twenty-two male (24.9 +/- 4.5 years, 1.78 +/- 0.06 m, 75.4 +/- 6.4 kg, 23.9 +/- 1.8 kg/m2) and eighteen female (21.1 +/- 1.5 years, 1.66 +/- 0.05 m, 63.4 +/- 6.5 kg, 22.9 +/- 2.5 kg/m2) amateur athletes participated. Peak torque (PT) of the knee extensor musculature, muscle stiffness (MS) of the vastus lateralis and musculoarticular stiffness (MAS) of the knee joint were assessed pre- and post- locally and generally induced fatigue (undertaken on two separate days with a one-week interval). Results: Males were characterized by higher values of MAS, relaxed and contracted MS, normalized PT (PT/body mass) and normalized MAS (MAS/external load) irrespective of time-point (p

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