Hata Koichi, Nakagawa Toru, Hasegawa Masayuki, Kitamura Hiroko, Hayashi Takeshi, Ogami Akira
Department of Work Systems and Health, Institute of Industrial Ecological Science, University of Occupational and Environmental Health.
J Occup Health. 2014;56(4):271-8. doi: 10.1539/joh.13-0243-oa. Epub 2014 Jun 21.
The purpose of this research was to evaluate the relationship between overtime work hours and CAVI, a new index of arterial stiffness.
We measured CAVI of Japanese workers (3,862 men) aged 26 to 59 years. Simultaneously, we obtained information on their monthly overtime work hours for the past few months using a self-administered questionnaire, with responses divided into five groups: <45, ≥45 and <60, ≥60 and <80, ≥80 and <100 and ≥100 hours/month. We calculated the odds ratios of CAVI≥9.0 for each group of overtime work hours.
In the full sample, there was no significant association between the average CAVI and overtime work hours. Taking<45 overtime hours/month as the reference category, the odds ratios of CAVI≥9.0 were as follows: OR=1.11, 95% CI=0.73-1.69 (≥45 and <60 hours/month); OR=0.92, 95% CI=0.48-1.76 (≥60 and <80 hours/month); OR=1.50, 95% CI=0.50-4.49 (≥80 and <100 hours/month); and OR=2.65, 95% CI=0.82-8.54 (≥100 hours/month). However, for workers in their 50 s, the odds ratio of CAVI≥9.0 was significantly higher among subjects with≥100 hours/month than among those with<45 hours/month (OR=4.26, 95% CI=1.2-15.1) CONCLUSIONS: The present study suggests that CAVI is more likely to be 9.0 or higher in workers in their 50 s when they work≥100 hours of overtime per month.
本研究旨在评估加班时长与动脉僵硬度新指标——中心动脉僵硬度指数（CAVI）之间的关系。
我们测量了年龄在26至59岁之间的日本男性工人（3862名）的CAVI。同时，我们通过一份自填式问卷获取了他们过去几个月的月加班时长信息，回答分为五组：<45、≥45且<60、≥60且<80、≥80且<100以及≥100小时/月。我们计算了每组加班时长下CAVI≥9.0的比值比。
在整个样本中，平均CAVI与加班时长之间没有显著关联。以每月加班时长<45小时为参照类别，CAVI≥9.0的比值比分别如下：OR = 1.11，95%置信区间 = 0.73 - 1.69（≥45且<60小时/月）；OR = 0.92，95%置信区间 = 0.48 - 1.76（≥60且<80小时/月）；OR = 1.50，95%置信区间 = 0.50 - 4.49（≥80且<100小时/月）；以及OR = 2.65，95%置信区间 = 0.82 - 8.54（≥100小时/月）。然而，对于50多岁的工人，每月加班≥100小时的受试者中CAVI≥9.0的比值比显著高于每月加班<45小时的受试者（OR = 4.26，95%置信区间 = 1.2 - 15.1）。结论：本研究表明，50多岁的工人每月加班≥100小时时，CAVI更有可能达到或高于9.0。
