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为了评价在日本林业工人中VWF(Vibrati on-Induced White Finger,振动性白指)的患病率变化情况,作者于1956～1980年进行了一个纵向队列研究。在测试中,按照中心频率为160Hz的1/3倍频程,在竖直轴向以500Hz,横轴向以400Hz和前后轴向以250Hz操作链锯,结果发现振动级只是偶而超过ISO/DIS5349国际标准的30分钟限度。在1958～1959年开始观察
To assess the prevalence of VWF (Vibrati on-Induced White Finger) among Japanese forestry workers, a longitudinal cohort study was conducted between 1956 and 1980. In the test, the chainsaw was operated at a center frequency of 1/3 Hz of 160 Hz, a vertical axis of 500 Hz, a horizontal axis of 400 Hz and front and rear axial directions at 250 Hz. As a result, it was found that the vibration level only occasionally exceeded ISO / DIS5349 International standard 30-minute limit. In 1958 ~ 1959 began to observe