Specifying the major factors, which induce the extreme delayed sleep and wake pattern frequently observed in Japanese people.

明确导致日本人经常观察到的极度延迟睡眠和觉醒模式的主要因素。

基本信息

批准号：
14510119
负责人：
FUKUDA Kazuhiko
金额：
$ 2.37万
依托单位：
Fukushima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

According to the survey conducted once every 5 years by NHK (Japanese corporation for public broadcasting), Japanese bedtime has became delayed about 1.5 hour during these 40 years and accordingly the total sleep time decreased for about 1 hour. Compared these conditions with other developed countries, i.e., European and North American countries, Japanese show an extremely delayed bedtime and reduced total sleep time. Why this nocturnally shifted lifestyle was developed among Japanese has not yet explained scientifically, many socio-cultural interpretations was proposed to"explain"the phenomenon, though. TV watching and cellular phone was pointed out as key factors ; however, those data necessarily prove its causality.We investigated these candidate factors, i.e., mass media and photo environment with university students and elderly persons as the subjects. They were restricted the total hour of watching TV in the second week and their lifestyle was compared with the baseline week. In elderly group, there are no significant differences between the two conditions. On the contrary, in the students, they showed delayed rise time as well as delayed bedtime in the TV restricted week. The students also showed the reduced activity (measured by a watch-type activity monitor) in the TV restricted week. Moreover, the students who showed extremely delayed lifestyle exposed themselves in an intense photo environment in the afternoon period as well as in the midnight.These results indicate that the same factor plays different rolls in different age groups, and in university students, who has no strong social constraints, TV has a roll of waking them up in early hours and making them active during daytime, as well as of delaying their bedtime. To make effective interventions against the delayed lifestyle, it is crucial to control those key factors and to take the characteristics of the subjects into consideration.

根据NHK（日本公共广播公司）每5年进行一次调查，日本就寝时间在这40年中延迟了约1.5小时，因此总的睡眠时间降低了约1小时。将这些条件与其他发达国家（即欧洲和北美国家）进行了比较，日本人的就寝时间延迟，总睡眠时间减少了。为什么在日本人之间开发这种夜间转变的生活方式尚未进行科学解释，因此提出了许多社会文化解释来“解释”这种现象。电视观看和蜂窝电话被指出为关键因素。但是，这些数据必然证明其因果关系。我们调查了这些候选因素，即以大学生和老年人为学科的大众媒体和照片环境。他们被限制在第二周看电视的总小时，并将他们的生活方式与基准周进行了比较。在老年人组中，两种条件之间没有显着差异。相反，在学生中，他们显示出延迟的上升时间，并且在电视限制的一周中显示出延迟的就寝时间。在电视限制的一周中，学生还显示了减少的活动（通过手表类型的活动监视器衡量）。此外，表现出极为延迟的生活方式的学生在下午和午夜时期都在强烈的照片环境中暴露了自己。这些结果表明，同一因素在不同年龄段的群体中和没有强大的社交限制的大学生中扮演着不同的卷，电视在没有强烈的社交限制的大学生中，在白天的早期和延迟床上的时间都在唤醒他们，并使他们活跃起来。为了对延迟的生活方式进行有效的干预措施，控制这些关键因素并考虑受试者的特征至关重要。