Effect of 1.5 T steady magnetic field on neuroconduction of a bullfrog sciatic nerve in a partially active state within several hours after extraction

The bullfrog sciatic nerve within six hours after extraction was determined from the change with time in the action potential and the impedance to be a partially active nerve. Steady magnetic fields have been determined to be ineffective in the neuroconduction in the fresh nerve just after extractio n, Although ion motions involved in the neuroconduction in the partially ac tive nerve are not normal, it was confirmed that a 1.5 T steady magnetic fi eld is ineffective in the neuroconduction in the partially active nerve. Th e obtained results suggest that the neuroconduction in damaged nerves is no t affected by the 1.5 T steady magnetic field used in MRI. (C) 1999 Elsevie r Science Inc.