Bilateral Synchronous Motor Responses Over the M. biceps brachii After Stimulation of the Sural Nerve

Introduction: Long latency reflexes (LLR) are poorly understood motor responses (MR) that occur after mechanical or electrical sensory stimuli. The presented data is in line with the concept that LLR evoked by remote stimuli may reflect non-thalamically transmitted arousal responses. Methods: MR were recorded over the tonically active biceps brachii (BB) muscle on either side of 11 healthy volunteers after supramaximal stimulation of the left sural nerve (1Hz single stimuli or trains of 2, 3, 4, or 5 stimuli with an interstimulus-interval of 3ms). Results: MR was reproducibly detected in all subjects. MR amplitu…