Fig. 4

Electromyographic Response to the Patellar Hammer Strike. a Hammer (red) and EMG response (blue) signals were both measured during data collection. Due to electrode proximity and equipment limitations, it is possible that the EMG signal bled into the measured stimulus. However, a distinct difference is observed between the hammer strike onset and peak EMG response. b Aligning the EMG peak reflex response reveals that the Jendrassik maneuver caused a visibly larger response than that of the natural stretch reflex. Shaded regions represent ± SEM