Subjective Complaints and Abnormal Change of the Digital Skin Temperature after Immersion in Cold Water among Vibratory Tool Workers

다국어 초록 (Multilingual Abstract)

1. Measurement of the vibratory intensities by frequencies of six vibratory instruments widely employed in our country showed that the highest vibratory intensity was found in one of the frequency bands 500 cps, 1,000 cps, 2,000 cps, and 4,000 cps: all of them are were in the category of high frequency.
2. Of tile 231 workers handling vibratory instruments, 77 persons (33%) complained subjective symptoms in fingers, and 67% had no complaints.
3. The most frequent complaint was "numbness with dull pain" and less frequently "blanching of fingers" "stiffeness of fingers", "dullness of sensitivity in fingers" and "pains in fingers", in the decreasing order.
4. The fingers most susceptible to the symptoms were the 2nd, 3rd, 4th fingers of both hand.
5. In cold reaction tests of the complaint and non-complaint groups, both of them being users of vibratory tools, it was revealed that the skin temperature of the finger while in immersion in water was markedly lower in both groups than in the control group. When the hand was out of water after immersion, the time of restoration of skin temperature was shorter in the non-complaint group and the control group than in the complaint group.