Sangyo Igaku
Online ISSN : 1881-1302
Print ISSN : 0047-1879
ISSN-L : 0047-1879
Volume 8, Issue 6
Displaying 1-3 of 3 articles from this issue
  • Satori HAYASHI, Miyoko HAYASHI
    1966 Volume 8 Issue 6 Pages 317-327
    Published: June 20, 1966
    Released on J-STAGE: April 14, 2008
    JOURNAL FREE ACCESS
    Two indices for "unmanageability" of various substances used in working environments were defined from the hygienic point of view. The one in Vapor Hazard Index (VHI), which includes a volatility factor, and the other Allowable Concentration Index (ACI), which includes no volatility factors. The values of VHI and ACI were calculated for various substances, and some considerations were made for those calculated values. A discussion was done about the situations in which the application of VHI or ACI is reasonable respectively. Furthermore some problems to which we might encounter in the application of these indices were considered from the theoretical and the practical stand points. Last of all a critical discussion was made for the classification of solvents adopted in the Regulation for Preventing Organic Solvent Poisonings. (No.24, Labor Ministry Regulations, 1960)
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  • Hirotoshi IWATA
    1966 Volume 8 Issue 6 Pages 328-332
    Published: June 20, 1966
    Released on J-STAGE: April 14, 2008
    JOURNAL FREE ACCESS
    Since Loriga described the peripheral vascular manifestations frequently associated with operations involving the use of pneumatic tools, various investigations and studies on disabilities resulting from the use of vibrating tools have been published in foreign countries and in Japan. Main signs of the disabilities resulting from the use of vibrating tools are; (1) blanching of fingers, (2) numbness of fingers, (3) joint pains, and (4) muscle pains. Among these blanching of fingers (Raynaud's phenomenon) have, in general, been taken as the most important. The vibration probably results in Raynaud's phenomenon in the workers using vibrating tools, and it might assist the gradual progress of the phenomenon. But the disorders are not followed by gangrene and loss of fingers or of the hand as the occupational form of the disease. Many theories as to the etiology of the Raynaud's phenomenon have been presented, but none of them yet established. Furthermore, methods of diagnosis of Raynaud's phenomenon for practical use in industrial medicine have scarcely been reported. Many studies of finger temperature at various conditions have been reported, and the phenomenon of slow recovery of the finger temperature after immersion in the cold water has been taken as an useful means of diagnosis of Raynaud's phenomenon. The author examined the relationship between the finger temperature and the Raynaud's phenomenon in a metal mine where many workers were frequently using various kinds of vibrating tools. The results are as follows: 1. As to the recovery rate of the finger temperature three minutes after immersion for 30 sec. in the cold water (0°C) toward the value before immersion, no significant difference was noticed between the fingers suffering from blanching and those without it. In the subjects, who had the Raynaud's phenomenon, the recovery time of the finger temperature after exposure to cold varied to some extent, and a definite characteristic tendency was not confirmed. For this reason, the recovery time of the finger temperature might not be a proper diagnostic clue for Raynaud's phenomenon. 2. Immersion of the hand of workers suffering from Raynaud's disease into the cold water (5°C) for five minutes could not provoke Raynaud's phenomenon. However, the temperature of fingers of such workers five minutes after five-minute immersion into the cold water (5°C) was lower than that of fingers of workers having no Raynaud's phenomenon.
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  • Shun'ich HORIGUCHI, Tadao UTSUNOMIYA, Akira KASAHARA, Kozo SHINAGAWA, ...
    1966 Volume 8 Issue 6 Pages 333-342
    Published: June 20, 1966
    Released on J-STAGE: April 14, 2008
    JOURNAL FREE ACCESS
    A hygienical survey was carried out on the works handling manganese compounds in Osaka over a period from December, 1963 to January, 1964. 1) Air analysis of the working environment Manganese concentrations in the working atmosphere showed 2.3 to 17.1 mg/m3 (median 8.4 mg/m3) for the work grinding manganese ore, 3.8 to 8.1 mg/m3 (median 4.9 mg/m3) for the work manufacturing electrodes, and 1.9 to 21.1 mg/m3 (median 4.3 mg/m3) for the work manufacturing dry cell batteries. 2) Medical examinations A hundred and thirty four workers chosen from 12 factories were examined on their health. Four workers in the factories grinding manganese ore were suspected of manganese poisoning showing clear signs of disorders of the central nervous system. Slight neurological signs were observed in 11 of 47 workers grinding manganese ore, 4 of 32 workers manufacturing electrodes, and 7 of 55 workers manufacturing dry cell batteries. However, no particular findings were seen in the blood and urin examinations, and these results showed no significant correlation to neurological findings. 3) Recommendation for hygienical countermeasures On the basis of the results above, the following advices were given to the factories surveyed; improvement of the processes and equipments in the dusty working places, strict enforcement of periodic medical and environmental examinations, early detection and adequate treatment of the workers showing any pathological signs, and thorough-going health education for the workers.
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