Cw. Garnham et al., MEASUREMENT OF THE ACTIVATING FUNCTION OF MAGNETIC STIMULATION USING COMBINED ELECTRICAL AND MAGNETIC STIMULI, Journal of medical engineering & technology, 19(2-3), 1995, pp. 57-61
The technique of combined magnetic and electrical stimulation of a per
ipheral nerve was used to determine the effectiveness of the combined
stimulus and its dependence on the relative positioning of electrodes
and stimulator coil along the axis of the nerve. The results were used
to determine the magnetic stimulation-activating function of a long,
straight nerve in the arm, and are shown to be consistent with publish
ed theoretical models constructed under conditions of simplified tissu
e geometry. With appropriate positioning of the two stimulators and si
milar tissue current waveforms, both enhancement and inhibition of an
electrical stimulus were demonstrated and the maximum amplitude of the
combined stimulus approached the arithmetic sum of that produced by e
ach stimulator individually.