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We physically examined of forest workers in the northern part of Fukushima District, Japan. The main purpose of this study was to survey the state of finger functions, especially the differences between the functions of right and left fingers of forest workers. This physical examination was conducted in winter. The items of the physical examination were hand grip strength, finger skin temperature, vibration sensation threshold, nail pressure test of the finger. Subjects were classified into A and B groups on the base of the results of the physical examination. A group is normal or slight disorder, and B group is disorder or illness. Hand grip strength was measured five times at five-second intervals. The decrease ratio of the left hand grip strength was greater than that of the right hand grip strength. Although there were significant differences among each finger of A and B groups, there were no big differences in the skin temperatures of the fingers in each group. Vibration sensation threshold was measured for II, III and IV fingers. The vibration sensation threshold of the index finger was the most sensitive and that of IV finger was the least sensitive. The vibration sensation threshold of the right fingers was more sensitive than that of the left fingers. The reaction times of the nail pressure test of the right fingers were generally faster than those of the left fingers. Forestry workers in Japan become elderly. There are big differences among the physical reactions or strengths of elderly people. Standard values for the measuring items for ageing are needed.

Influence of Local Vibration on Finger Functions of Forest Workers.