Figure 4From: Elbow spasticity during passive stretch-reflex: clinical evaluation using a wearable sensor systemExample of EMG processing and muscle onset prediction from EMG data stretch-reflex testing of a patient with high flexor tone (MAS =  3) . The top panel shows the patient’s angular displacement curves for actual and reference profiles. The next two panels show raw and rectified signals, respectively, and the bottom panel shows low-pass (10 Hz) filtered EMG waveform. Onset time (Te) was determined by the first peak that surpassed a 20% change in EMG amplitude from pre-onset EMG. The change in EMG amplitude was used to represent the discrete change in EMG intensity antagonist (ΔantE) muscle, and area-under-the-curve was used to represent density measurement of EMG amplitude over the trial duration for antagonist (ϵantE) muscles (hatched region).Back to article page