Isokinetic muscle test, electromyographic Turn/Amplitude analysis and Isometric contraction power at maximum contraction were measured in 84 biceps brachii muscles of 42 normal adult subjects. The arm circumference and weight of subjects were measured also. And the interrelationship among several parameters has been studied by Pearson correlation analysis. The purpose of this study were intended to know the relationship between isokinetic measurement and electromyographic method in muscle power measurement and to know the significance of turn/Amplitude analysis in muscle power measurement. The results were as follows;

1) The faster the angle velocity of isokinetic test, the smaller the peak torque in elbow flexor. The difference between peak torque at each side was not significant at low speed test but significant at speed test. The differences of peak-torque accelerating energy and average power were not significant at each side.

2) The peak torque was at 66.9 degree elbow flexion in low speed test and at 64.4 degree in fast speed test.

3) The difference of Turn/sec and Mean amplitude/Turn were not significant at each sex and each side. But the difference of Mean amplitude (Amp/Turn) was significant at each sex and each side.

4) The difference of isometric contraction power was significant at each sex and each side.

5) The relationship between the parameters of isokinetic test and isometric contraction power was correlated significantly. And the relationship between the parameters of isokinetics and Mean amplitude (Amp/Turn) of EMG method was correlated statistically but not so significantly. But the relationship between the isokinetics and Turn/sec of EMG method was not correlated.

6) The relationship between Mean amplitude (Amp/Turn) of EMG and Isometric contraction power was correlated statisfically but not so significantly. But the relationship between Turn/sec of EMG and Isometric contraction power was not correlated.

7) These results showed that the relationships between the Turn/Amplitude analysis of EMG method and Isokinetic or Isometric method were correlated (but low significance) at maximum contraction effort. But in the pathologic conditions, the Turn/Amplitude analysis will be more meaningful in measurement of muscle power.