Burström Lage, Hagberg Mats, Lundström Ronnie, Nilsson Tohr
National Institute for Working Life, Department of Work and the Physical Environment, PO Box 7654 SE-907 13 Umeå, Sweden.
Scand J Work Environ Health. 2006 Jun;32(3):198-203. doi: 10.5271/sjweh.999.
This study examined onset time for reported vascular and neurological symptoms in relation to the vibration load in a group of workers exposed to vibration.
Information on the self-stated year for the first occurrence of symptoms was collected by means of questionnaires. During interviews data were obtained on self-stated estimations of daily exposure time, type of tool, and number of months or years with different exposures. The estimations of the vibration magnitudes of exposure were based on conducted measurements. From these data, the individual vibration exposure at the time of onset of symptoms was calculated.
The incidence was 25.6 and 32.9 per 1000 exposure years for vascular and neurological symptoms, respectively, in the group of workers. The first onset of symptoms appeared after an average of 12 years of exposure. For the workers, the symptoms of vascular or neurological disorders started after about the same number of exposure years. The calculated accumulated acceleration correlated best with the onset time of symptoms.
It was concluded that, since the workers' exposure to vibration was below the action level established in the European vibration directive, the results suggest that the action level is not a safe level for avoiding vascular and neurological symptoms.
本研究调查了一组接触振动的工人中，所报告的血管和神经症状的发病时间与振动负荷之间的关系。
通过问卷调查收集关于症状首次出现的自我陈述年份的信息。在访谈中，获取了关于自我陈述的每日暴露时间估计、工具类型以及不同暴露时长的月数或年数的数据。暴露振动强度的估计基于进行的测量。根据这些数据，计算出症状出现时的个体振动暴露量。
该组工人中，血管症状和神经症状的发病率分别为每1000暴露年25.6例和32.9例。症状首次出现平均在暴露12年后。对于这些工人，血管或神经疾病症状在大约相同的暴露年限后开始出现。计算得出的累积加速度与症状发病时间的相关性最佳。
得出的结论是，由于工人接触振动的程度低于欧洲振动指令规定的行动水平，结果表明该行动水平并非避免血管和神经症状的安全水平。
