| Project/Area Number |
04454222
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
公衆衛生学
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| Research Institution | Kanazawa University |
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Principal Investigator |
OKADA Akira Kanazawa University, President, 学長 (10019573)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Hiroyuki Kanazawa University, Associate Professor, 医学部, 助教授 (30231476)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥6,800,000 (Direct Cost: ¥6,800,000)
Fiscal Year 1993: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1992: ¥4,600,000 (Direct Cost: ¥4,600,000)
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| Keywords | Vibration / Impulsiveness / Blood flow / Peripheral circulation / Grasping / ISO / Crest factor / Pneumatic tools / 複合影響 / crest factor / 未梢循環動態 / 労働環境 / 周波数分析 |
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| Research Abstract |
Altough deteriorating effects of shock-type vibration on hand-arm have been pointed out, the international standard for hand-arm vibration exposure have not provided available information on shock-type vibration. Waves produced by the normal use of chain-saw, pneumatic hammer, pneumatic riveting hammer, and pneumatic nailer at workplaces was recorded and analyzed. The order of the size in the impulsiveness, crest factor (CF) was chain-saw, pneumatic hammer, pneumatic riveting hammer, and pneumatic nailer at a constant frequency-weighted rms acceleration at x direction (a_<xhw>) of 6.3 m/s^2. No statistically significant effects of shock was recognized in comparisons of subjective response to shock-type vibration with that to shockless vibration of shain-saw. Effects of shock on peripheral circulation was examined by monitoring finger skin blood flow induced by the shock-type vibration at a constant frequency-weighted rms acceleration at x direction (a_<xhw>) of 6.3 m/s^2. In a result, pneumatic nailer with the CF of 9.5 produced significant decreases in the blood flow at 4 and 5 min after the exposure. This result suggests that effects of vibration should be assessed including the size of the impulsiveness. Experiments examining effects of hand-grasping showed significant reduction in peripheral blood flow associated with the grasping. Tools with measures which protect vibration from transmitting into hand-arm easily with the growth of grasping force should be developed in future.
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