The effect of specific EMG Biofeedback treatment was determined with 14 cases of 4 muscles(3 muscles on upper limb and one lower limb) which recieved 12 feedback training sessions. The assesment of result was performed 4 periods; biweekly and weekly with APA (Action potential analyzer: APA) of TECA 42 EMG system.

These data were compared with changes measured by control group(6 patients) of routine P.T only.

The results were as follows;

1) Pre-expermental base line differences of resting action potential and active action potential revealed statistically not significant(P>0.1)

2) Comparison oof mean amplitude of active action potentials of difference first and last assesment(4th week) between experimental and control group resulted in significant increase of mean amplitude(P<0.001), eventhough not homogenous variance in m. Triceps brachii and Tibialis auticus in F-distribution.

3) Comparison of mean amplitude of active action potentials within experimental group between 9 sessions of EMGBF(3rd week) and 12 sessions are statistically significant(P<0.001)

4) The comparison of proportion of independent values between experimantal(EMGBF+PT) and control(PT only) group by chi-square test 4 muscle of tested revealed statistically significant differences.(P<0.04 in m Deltoideus, P<0.02 m, biceps brachii, p≦0.006 m, Triceps Brachii and p<0.01 in Tibialis Anterior muscle).