Mansei-hirou no hassei, sinten, kaihuku ni okeru suimin-kakusei jhoken ni kansuru kenkyu

在本研究中，我们分析了一个karo-shogai案例，涉及一名白领工人在减少工作时间的方案下。该病例在提供发病前24周（6个月）内工作和生活条件的全面客观数据方面是不寻常的。促使S发生karo-shogai的原因是S可以在任何地点或时间使用笔记本电脑进行业务活动，以及作为双重角色员工进行业务活动的性质。S的karo-shogai发病符合斋藤的三个标准——多重负担、发病前三个月的过度劳累、假期缺乏生理和精神休养。假期缺乏真正的生理和精神休息可能是由于醒着时经历的各种情绪，以及由于担心引起的睡眠困难而缺乏慢波睡眠。S的karo-shogai发病过程分为三个阶段：1)电子邮件相关参数恶化；2)增加工作时间；3)睡眠时间减少。本病例不支持Wada的假设，即在过劳死发作之前的工作量通常更高。总之，我们需要详细检查如何应用工作负载以及如何延迟结果，同时认识到在病情发作之前工作负载不一定是最繁重的可能性。一种办法是从给定工作周内工作量的角度调查疲劳如何在正常工作日和假日增加，这是本案例研究采用的办法，并设法理解这种增加作为时间序列变化。

In the present study, we analyzed a karo-shogai case, involving, a white-collar worker under a regimen of reduced work hours. The case was unusual in providing comprehensive objective data on working and living conditions over the course of 24 weeks (six months) preceding the condition onset. Promoting the onset of karo-shogai for S was the fact that S was able to perform business activities with his laptop computer at any place or time and the nature of business activities as a dual-role employee. The onset of karo-shogai for S met Saito's three criteria - multiple burdens, overwork from three months before the condition onset, and lack of physiological and mental recuperation on holidays. The lack of real physiological and mental rest on holidays is likely attributable to various emotions experienced during waking and to the absence of slow-wave sleep due to trouble sleeping caused by apprehension. The process of karo-shogai onset for S consisted of three phases: l) worsening e-mail related parameters; 2) increased working hours; 3) fewer hours slept. The present case does not support Wada's hypothesis that workloads immediately preceding karoshi onset are generally higher. In conclusion, we need to examine in detail how workloads are applied and how the consequences are delayed, while recognizing the possibility that workloads are not necessarily heaviest immediately before the condition onset. One approach would be to investigate how fatigue increases on both normal workdays and holidays from the viewpoint of workloads within a given work week, the approach adopted in the present case study, and to seek to understand such increases as time series variations.