STUDY OF FUNCTION OF FINGERS BY PHYSIOLOGICAL TREMOR

1. Physiological tremor is invisible mechanical vibration of body part s. 2. It has two peak frequencies in the power spectrum. The origin of the peaks has not been well elucidated. Therefore, the mechanism and its application to labor science is studied in the paper. 3. The effec t of immersion of fingers in water and of loading weights on; fingers are performed to elucidate the mechanism involved. 4. It is found that the power spectrum output has two bands from the lower frequency band (1.5-18 Hz) from the CNS and the higher frequency band (18-50 Hz). 5. These results are applied to the evaluation of fatigue of fingers in tapping and typing work. 6. The total power, which is the sum of power spectrum in frequency range between 1.5 and 50 Hz, is employed as eva luational index. The change of total power explains finger fatigue dur ing tapping and typing loads. 7. Physiological tremor is an effective way of evaluating the function of fingers in human work.