<Original Paper>The recovery process of impact spinal cord injury by magnetically evoked EMGs

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To investigate the changes of spinal cord function following induced impact trauma, the time course of magnetically evoked EMGs (motor evoked potentials (MEP), M-, F-waves and H-reflex)) in the tibialis anterior muscle were recorded in rats. The histological changes induced by a controlled impact device was observed on edema, hemorrhage and necrosis, and finally the lesion became a cavity which was surrounded by thick glia fibers. Recording of magnetically EMGs activity corresponds to H-reflex and M-response, allowing examination of the neuronal state of the spinal cord, while MEP by transcranial magnetic stimulation was recorded to detect abnormalities of the descending tract. MEP and H-reflex disappeared immediately after the trauma, and the thresholds of the M-wave shifted to higher levels. The activity of the lower extremities improved by 4 weeks. At 8 weeks after the trauma, H-reflexes were partially recovered, but had longer latencies and smaller amplitudes, and MEP could not be induced. These results suggested that magnetically evoked EMGs are useful for monitoring the recovery of the networks and neural plasticity after spinal lesions.

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