A Longitudinal Study on Raynaud's Phenomenon in Workers Using an Impact Wrench

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<b>Objectives:</b> The purpose of this study was to clarify the occurrence of Raynaud’s phenomenon among workers using an impact wrench for a long time. <b>Methods:</b> The subjects were 704 workers regularly using an impact wrench and taking special medical examinations for vibration syndrome from 1981 to 2008. Raynaud’s phenomenon was observed in 39 subjects during the observation period. <b>Results:</b> The mean operating years at the occurrence of Raynaud’s phenomenon was 25.5 ± 8.3 (standard deviation) yr. The mean total operating time (geometric average) at the occurrence of Raynaud’s phenomenon was 11,689 h. By the person-year method, the incidence rate of Raynaud’s phenomenon was 6.27 persons per 1,000 person-years. The estimated risk of developing Raynaud’s phenomenon did not increase until 12 years after starting to operate an impact wrench but increased exponentially after that. The vibration level of an impact wrench (from 4.9 m/s<sup>2</sup> to 22.6 m/s<sup>2</sup>) exceeded the occupational exposure limit value (4.9 m/s<sup>2</sup>). Various countermeasures, such as introducing automatically apparatus and keeping the working environment warm to protect from cold exposure, were taken at the factory. <b>Conclusions:</b> These findings showed that the rate of occurrence of Raynaud’s phenomenon was not high, although the vibration level of the impact wrench was high. This may result from various countermeasures to prevent the occurrence of Raynaud’s phenomenon. A long period of exposure to vibration had the potential to lead to the occurrence of Raynaud’s phenomenon even under various countermeasures.

収録刊行物

  • Journal of occupational health

    Journal of occupational health 54(2), 96-102, 2012-03-01

    公益社団法人 日本産業衛生学会

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各種コード

  • NII論文ID(NAID)
    10030138880
  • NII書誌ID(NCID)
    AA11090645
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13419145
  • NDL 記事登録ID
    023556709
  • NDL 請求記号
    Z54-J76
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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