Example reflexes from a single subject for all experimental conditions. Reflexes evoked by simultaneous SR + SP stimulation during locomotor activation (arm & leg cycling) show clear amplification (see arrow at left). This effect is absent during static contraction (see arrow at right). Abbreviations: SR, superficial radial nerve; SP, superficial peroneal nerve; SR + SP, simultaneous combined stimulation of SR and SP nerves; SUM, mathematical summation of independent SR and SP reflexes.
Nakajima et al. BMC Neuroscience 2013 14:28 doi:10.1186/1471-2202-14-28