Vibration-induced Effects Caused by Impact Wrenches Used in Truck Assembly
通过问卷调查904名工人，研究卡车装配中使用冲击扳手导致振动性白指和麻木的风险，发现暴露7-9年时23%出现白指、33%出现麻木。
The objective of the study was to evaluate the risk of developing vibration-induced white finger (VWF) and numbness during truck assembly with impact wrenches, and the method used was a cross-sectional study made with questionnaires. Of the 904 workers asked about their use of the tool, 262 were identified as ”solely exposed” to impact wrenches, the mean exposure time being 6.7 years. The acceleration range was 3.9-18.1 m/s^2, When the exposure dose was estimated by exposure years, a dose-response relationship existed up to the exposure class 7-9 years. In this exposure class, 23 % were affected by VWF and 33 % by numbness. Although the results indicate moderate vibration-induced effects for most of the impact wrenches in use during truck assembly, the effects can be considerable for some of the tools. For the numbness symptom, confounding factor s and some other aspects may make the result more uncertain.