Biofeedback is autoregulation or self-control technique that improve the patient to control a wide range of internal physiologic process shown through visual or auditory signal of the equipment. In this experiment, we used the EMG biofeedback treatment, one of the biofeedback methods, and confirmed the effect of EMGBF in the paretic patients caused by hemiplegia mainly and the other nerve injuries. Biofeedback training using TECA EMG system was practiced 3 times per week for 4~6 weeks and total 33 patients were assessed the amplitude, frequency, mean rectified amplitude weekly or biweekly with action potential analyzer.

The result were followings:

1) In CNS disorders, there was no difference between experimental and control groups in the incipient stage of EMGBF training on mean rectified amplitude(MRA) and significant difference was shown after 3 weeks. MRA of active action potential increased significantly in the last assessment of the experiment. The results were approved statistically by chisquare test.

2) In cases of facial palsy, monoparesis due to spinal cord compression, peripheral nerve injuries including radiculopathy and common peroneal nerve palsy, rheumatoid myopathy, EMGBF training brought about increase of the MRA in proportion to the duration of treatment. EMGBF was terminated when MRA on the involved muscle reached to the level of normal side.

3) In case of foreign body in brain, spinal cord stroke and early peripheral nerve injury, EMGBF treatment had no effects.