EMG and tibial translation data fromone representative subject.

EMG activity of biceps femorisand semitendinosus/semimembranosus as well as posterior-anteriortibial translation of one subject. In the figure, EMG data isrectified in order to visualize the different parts of the hamstring stretchreflex. The vertical bold line indicates the onset of posterior-anteriortibial translation. Three different time intervals were analyzed (20–40,40–60 and 60–95 ms).