Departmental Bulletin Paper 起床前漸増光照射による目覚めの気分改善効果の検証
The verification of awakening mood improvement effect due to dawn simulation

青木, 真理  ,  神川, 康子  ,  戸田, 直宏  ,  八田, 和洋

Description
As part of the trials to improve the living habits of children and adults, we examined the influence of dawn simulation on participants' feeling when getting up, on their overall drowsiness, and on their subjective concentration in the daytime. Sleep and lifestyle records were collected from 75 males and females consisting of fourth to sixth grade elementary school students and their 30 to 50 year old parents. Informed consent to install a dawn simulation device in one or more bedrooms was obtained from 41 households in Toyama Prefecture. Data about their sleep and lifestyles was recorded for 21 days. The experiment was conducted in Toyama Prefecture at two different times of year. The first was from early May to late July (the summer experiment), when the hours of daylight are relatively long. The second period was from early to late November (the winter experiment), when the hours of daylight are relatively short. Participants were subjected to each of the three conditions for one week at a time for a total of three weeks. The three conditions are: 15 minutes of dawn simulation, 30 minutes of dawn simulation, No dawn simulation as a control. As a result, in the summer period, even though the time was around the summer solstice with long hours of daylight, on the whole there was a significant difference between children and adults exposed to dawn simulation and those under the no DS (dawn simulation) condition. The participants who woke using dawn simulation reported an ease in getting up, an improved overall morning feeling and showed improvements in both their concentration and feeling in the morning and afternoon. Conversely, in the winter period, there was no significant difference between the conditions. There was, however, a small difference seen between men and women and between generations in this period. Notably, an improvement in mood upon wakening was seen in participants with a late bedtime and those who sleep for a short time and were exposed to dawn simulation while waking.
光は,目を通して脳を刺激し,目覚めや生体リズムに影響を与えている。自然環境の光は毎朝同じではなく,天候や季節によっても左右され,都合よく浴びることができない。先行研究では,高齢者において高照度光照射により認知機能が改善されたり,成人において起床前漸増光照射により生活リズムが改善されたりするという報告がされているが,小学生など児童を対象とした研究は未だ結論が得られていない。そこで本研究では,小学生とその保護者を対象に起床前漸増光を「15分前照射」「30分前照射」「照射無し」の3条件で睡眠・生活記録を行い,睡眠の質,起床時や朝の気分,次の日の寝つきにどのような影響を及ぼすのかについて検証した。
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