The electromyography (EMG) of a male teenager performing isokinetic exercise is conducted to realize the characteristics of femoral muscles in human knee movement. The raw EMG data of rectus femoris muscle and biceps femoris muscle are full-wave rectified to demonstrate the electromechanical delay that ranges from 50 to 100 ms. The mean of biceps femoris EMG in isokinetics knee flexion is approximately 3-4 times as much as that of rectus femoris EMG in isokinetics knee extension. The rectified EMG signals are smoothed by using moving average method to receive a linear envelope that outlines the mean trend of EMG signals. It gives a clear perspective to observe the relation between the micro-scale EMG signal and the macro-scale kinetic data. This paper presents an important basis to establish a mechanical model of muscle for human knee movement.

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