Since isokinetic exercise equipment can give an evaluation of muscle strength with great accuracy and objectivity, it is more widely using as the one of the important methods in rehabilitation and sports medicine.

The aim of this paper is to determine the normative strength values for wrist flexor and extensor and to set up the accurate measuring criterion of the strength in case of manual muscle test of wrist comparing variation of strength as the change of elbow joint angle.

This test is carried out for the strength of wrist flexor and extensor on the condition that the subjects are 30 healthy men from 3rd to 4th decade at the speed of 60^o/sec and the elbow were flexed at 90^o and 45^o and were extened at 0^o.

The results were as follows:

1) The mean peak torque of elbow flexor were 9.12±2.08 ft-lbs at 90^o of elbow angle, 7.17±1.67 ft-lbs at 45^o, 5.02±2.78 ft-lbs at 0^o.

2) The mean peak torque of elbow extensor were 4.52±1.76 ft-bls at 90^o of elbow angle, 3.52±1.85 ft-lbs at 45o, 2.17±1.45 and 43.2% at 0^o.

3) The ratio between the peak torque of two muscle group at 90o of elbow angle were 49.5% at 90^o at 90^o at elbow angle, 46.9% at 45^o and 43.2% at 0^o.

According to above data, the peak torque of two muscle group at 90^o of elbow angle were significant higher than at 45o and 0o of elbow angle, therefore we concluded that the manual muscle test of wrist flexor and extensor had better be performed at 90^o of elbow angle.