We surveyed the relationship between the compound muscle action potentials and forces in upper extremity. The motor nerve conduction velocities, pinch power and integrated EMG values were obtained. Correlation analysis was done between the values measured.

The results were as follows:

1) Near linear correlation exists between grip strength and IEMG of ADQ in gripping

2) High correlation exists between tip pinch power and IEMG of APB in pinching

3) Significant correlation exists between grip strength and CMAP area of ulnar nerve

4) No definite correlation exists between valiables of NCS and IEMG in normal subjects