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Assessment of Vibration Produced by the Grinder Used in the Shipbuilding Industry and Development of Prospective Prevalence Model of Hand-arm Vibration Syndrome  

Yim, Sanghyuk (Wonju Institute for Occupational and Environmental Health)
Lee, Yunkeun (Wonju Institute for Occupational and Environmental Health)
Park, Hee-Sok (Department of Industrial & Information Engineering, Hong-ik University)
Publication Information
Journal of Korean Society of Occupational and Environmental Hygiene / v.16, no.4, 2006 , pp. 398-412 More about this Journal
Abstract
The purpose of this study is to investigate the relationship between the acceleration of vibration by the powered hand tools used in the shipbuilding industry, and to develop the prospective prevalence model for the hand-arm vibration syndrome among the shipbuilding workers.The acceleration levels and frequencies of six types of grinder were measured using the ISO5349 method along with the time of exposure to the vibration from the powered hand tools. Medical examination for 114 workers were performed using the cold provocation test. Comparisons were made between the estimated prevalence of hand-arm vibration syndrome from ISO5349 and the observed values from the medical examinations. By multiple regression, we developed the prospective prevalence model of hand-arm vibration syndrome produced by the hand tools used in the shipbuilding industry. 4 hour-energy-equivalent frequency-weighted accelerations were $6.23m/s^2$ in the grinding job done after welding, and $13.39m/s^2$ in the grinding job done before painting. The mean exposure time while holding powered hand tools was 4.64 hours. Prevalence rates of Raynaud's Phenomenon were 12.04% in the grinding after soldering, and 42.9% in the grinding before painting measured using the ISO5349 method. After exposure to vibration for 10.79 years, about a half of the workers in the grinding after welding could developed Raynaud's Phenomenon. For the workers in the grinding before painting, the latency was 5.02 years. The ISO equation for dose response relationship was not significantly correlated with observed recovery rates of finger skin temperatures, blood flows and amplitudes of nerve conduction velocities. A multiple regression model for dose-response relationship was proposed from the results. Recovery rate of the skin temperatures = -0.668+ 0.337 ${\times}$ 4 hour energy equivalent frequency-weighted accelerations + 0.767 ${\times}$ duration of vibration exposure(years) The validity was proved by multiple regression analysis after correlation transformation and regression results based on model-building data and validation data.
Keywords
vibration; acceleration; Hand-arm Vibration Syndrome; Raynaud's phenomenon; ISO5349;
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Times Cited By KSCI : 1  (Citation Analysis)
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