Abstract
Muscular fatigue was investigated in m.rectus femoris, m. vastus lateralis and medialis
of 15 patients after an anterior cruciate ligament injury. Using a Lido active (isokinetic)
dynamometer, combined eccentric and concentric contractions were carried out at intermediate
contractile velocity speeds (150°, 240°/s). In addition, concentric contractions were
also performed at fast angular velocities (300°, 400°/s). The results indicated that
fatigue was significantly greater for the intermediate speeds. Given one angular velocity,
the average eccentric force decline was more pronounced than the concentric one. At
all velocities the relative decrease of peak torque (PT) was smaller than for contractional
work (CW).
Key words
Isokinetic - electromyography - fatigue - eccentric - stretch-shortening cycle - rehabilitation
