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Fig. 1 | Journal of NeuroEngineering and Rehabilitation

Fig. 1

From: Biceps femoris late latency responses and the “notching sign” in spasticity

Fig. 1

A pendulum triggered by the patellar T reflex -Normal case. The top trace shows the pendulum triggered by the patellar T reflex, recorded using a goniometer. The knee angle is 90°. The pendulum starts with a knee extension and ends with a seven beat (Pc) oscillation. The damping ratio (DR) is calculated as the ratio of Ө2 / Ө1. The oscillation frequency (f) has been calculated by the duration of the first beat (t) as 1 / t. The second row of the traces is rectified surface EMG recorded from the rectus femoris muscle. In the third row, rectified EMG activity of the biceps femoris muscle is displayed. The bottom trace indicates that the patellar T reflex has been triggered. The scale is shown on the vertical line. The upper scale is the angle in degrees, while the middle and lower traces scales are shown in mV amplitude. The sweep speed is shown on the bottom right

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