THE EFFECTS OF SLEEPING TYPE ON THE CARDIOVASCULAR RISK FACTORS IN JAPANESE WORKERS ENGAGED IN LONG WORKING TIME.

背景过劳和慢性疲劳所致的死亡被认为与睡眠状况有关。目的明确工作时间或睡眠类型与精神状态和慢性疲劳作为心血管疾病危险因素之间的关系。方法以1505名男性日间工作人员为研究对象，以抑郁自评量表(SDS)和累积疲劳症状指数(CFSI)为因变量，以其他潜在协变量为自变量，对早晚睡眠类型、平均血压、糖化血红蛋白(HbA1c)、糖化血红蛋白(HbA1c)、糖化血红蛋白(HbA1c)血清总胆固醇和高密度脂蛋白胆固醇显著升高。ANCOVA结果显示，工作时间大于或等于260小时/月的人群中，晚间工作类型的抑郁自评量表和CFSI得分显著高于其他组。结论260小时/月工作时间或以上会增加疲劳症状，提示睡眠类型对心理状态、慢性疲劳等心血管危险因素有影响。

Background "Karo-shi", the death caused by overworking and chronic fatigue, is considered to be related to sleeping condition. And a developing of the method of evaluating chronic fatigue by overworking may be very important to prevent "karo-shi" caused by cardiovascular disease.Aim To clarify the relationships between working hours or sleeping type and mental status and chronic fatigue as risk factors of cardiovascular disease.Methods On 1505 male day workers, effects of sleeping type according to Morning-Evening Scale and working hours/month subdivided into 6 group were determined using Self rating Depression Scale(SDS) and Cumulative Fatigue Symptom Index(CFSI) as dependent variables, and other potential covariates as independent variables by ANCOVA.Results In the group Morning type, BMI, mean blood pressure, HbA1c, total serum cholesterol and HDL cholesterol were significantly increased. The results of ANCOVA indicate that in the group working 【greater than or equal】260 hours/month and that scores of SDS and CFSI in evening type were significantly higher than other groups.Conclusions The present results clarified that 260 or more hours/month working hours increased fatigue symptoms, and suggests that sleeping type affects on the mental status, chronic fatigue and other cardiovascular risk factors.