鋳鋼品製造工場における振動障害
第1報 自覚症状について
1978 年 20 巻 5 号 p. 261-267
詳細
1978 年 20 巻 5 号 p. 261-267
A study has been conducted on 71 men using vibratory tools in a factory of steel foundry situated in Fukushima Prefecture in Japan. They have been engaged in the work with pneumatic instruments : 21 men, chipping hammer (CH) work ; 29 men, air grinder (AG) work ; 4 men, sand rammer (SR) work ; 16 men, work with mixed tools mentioned above (MT). The users were interviewed principally on the basis of the standard form of the questionnaire which had been designed by Labor Ministry as the guide for the survey of vibration syndrome in forest workers. The operating hours with CH, AG and SR were about 2, from 5 to 6 and from 1 to 2 hours per day, respectively. Seventeen out of 71 men had worked for less than 1/2 year.
The data obtained were analysed and summarized as follows :
1. The group of CH users who worked for 1/2 year or more showed higher prevalence of Raynaud's phenomenon and hypoesthesia or paresthesia than the group of 17 users who worked for less than 1/2 year.
2. The group of AG users who worked for 1/2 year or more indicated higher prevalence of Raynaud's phenomenon and fatigue than the group of users who worked for less than 1/2 year.
3. The attacks of Raynaud's phenomenon in the CH users were restricted to the left hand which held a chisel.
4. The prevalence rates of Raynaud's phenomenon in the groups of CH, AG and MT users were 23%, 23% and 25%, respectively, and when taken account of the occurence rate in each period of the experience of the work, the cummulative values reached to 31%, 69% and 23% in the groups of CH, AG and MT users, respectively.
5. No Raynaud's phenomenon was observed among SR users.
6. The attack of Raynaud's phenomenon was observed exclusively in cold season and occurred almost on the way to work shop or before leaving home in the early morning and rarely in the working premises.
7. The workers who suffered from Raynaud's phenomenon had more complaints of hypoesthesia or paresthesia, heavy feeling in arms and difficulty in writing clearly than those who did not have the phenomenon.
