Iwasaki K, Sasaki T, Oka T, Hisanaga N
National Institute of Industrial Health, Kawasaki, Japan.
Ind Health. 1998 Oct;36(4):361-7. doi: 10.2486/indhealth.36.361.
A field survey of 71 salesmen (22-60 years) in a machinery manufacturing company was conducted to investigate the effect of working hours on biological functions related to the cardiovascular system. The subjects were divided into four groups by age, and those in each age group were further divided into shorter (SWH) and longer (LWH) working hour subgroups by weekly working hours. Rates of complaints of subjective fatigue for LWH were significantly higher than those for SWH on the whole. Although the mean amplitude of respiratory sinus arrhythmia at rest decreased with age, no significant difference between SWH and LWH was found in this function. Systolic blood pressure for LWH was significantly higher than that for SWH in the 50-60 year group. The serum total cholesterol level for LWH was significantly lower than that for SWH in the 40-49 year group. Comparison of biological functions related to cardiovascular system was also made between fatigue complaint and no-complaint subgroups. Significant differences were found between the two subgroups: systolic blood pressure was higher and the total cholesterol level was lower in the fatigue complaint subgroups. Summarizing our results, it appeared that long working hours might increase systolic blood pressure and lower the total cholesterol level due to fatigue.
对一家机械制造公司的71名销售人员（22 - 60岁）进行了一项实地调查，以研究工作时间对与心血管系统相关的生物学功能的影响。根据年龄将受试者分为四组，每个年龄组的受试者再根据每周工作时间进一步分为工作时间较短（SWH）和较长（LWH）的亚组。总体而言，LWH组主观疲劳投诉率显著高于SWH组。虽然静息时呼吸性窦性心律不齐的平均幅度随年龄下降，但在该功能上SWH组和LWH组之间未发现显著差异。在50 - 60岁年龄组中，LWH组的收缩压显著高于SWH组。在40 - 49岁年龄组中，LWH组的血清总胆固醇水平显著低于SWH组。还对有疲劳投诉和无疲劳投诉亚组之间与心血管系统相关的生物学功能进行了比较。在两个亚组之间发现了显著差异：有疲劳投诉的亚组收缩压较高，总胆固醇水平较低。总结我们的结果，长时间工作似乎可能由于疲劳而导致收缩压升高和总胆固醇水平降低。
