High-frequency vibration and sensory nerves
研究了芬兰铸造厂工人因使用锆刚玉砂轮产生高频振动而引发振动性白指病，并追踪了1979至1983年间感觉神经传导速度的变化，发现高频振动是导致神经损伤的主要原因。
In 1977 a Finnish foundry implemented the use of new wheels of zirconium corundum for pedestal grinding. Within a year the workers developed vibration-induced white finger (VWF). Ten were studied electroneuromyographically in 1979, and again in 1980 and 1983 after the zirconium corundum had been replaced by normal corundum. In 1979 the mean distal sensory conduction velocity (dSCV) of the median nerve was below the lower normal limit, and that of the ulnar nerve was close to the normal limit. Only two workers had a normal dSCV of the median nerve bilaterally, whereas four had a normal ulnar nerve value bilaterally. The results had improved slightly in 1980 and 1983, the mean values being within normal limits with some individual values still abnormal. Subjective symptoms were still frequent in 1983, the same nine workers still complaining of paresthesias in the hands and fingers and five reporting hand-arm pain. All still had VWF attacks, at least occasionally. The higher impulsiveness of the vibration from the zirconium corundum wheels, together with high-frequency components of vibration, was considered to be the major cause of the quick development of the sensory nerve damage that was found in 1979.