長期キャンプ（30 泊 31 日）が子どもの生体リズムに 及ぼす生化学的影響

野井 真吾, 鹿野 晶子, 土田 豊, 小澤 治夫

doi:10.5332/hatsuhatsu.2013.25

There has been much concern lately regarding the increasingly late hour at which children to go sleep, as well as their shortened sleeping hours. For this reason, solutions are sought for addressing the problems of childrenʼs sleep as well as the disturbances in biorhythms which are believed to be at their root. The purpose of this study was to examine whether biochemical influences arose within the biorhythms of children by having them participate in a long-term camp (30 nights and 31 days). Research 1 was carried out in order to examine any changes in the melatonin metabolism of the children by the starting and ending of the longterm camp. The samples analysed in Research 1 were from the data based on eleven healthy male and female children from the ages of 9 to 12 years old. Their saliva was always collected at 21:30 across twelve selected days (10, 8, 6, 4, and 2 days before the start of the camp, the first, second, third, fifteenth and twenty-ninth day during the camp, and finally the fourteenth and twenty-eighth day after the camp). Meanwhile, Research 2 was analysed hormonal metabolism through the long-term camp, using data on eight healthy male children from 9 to 10 years old. Their saliva and urine were collected at two different time intervals:one at 21:30 (night) and the other at 6:00 o'clock(morning), across five periods (between 9 and 10 days before the camp, between the second and third day of the camp, between the sixteenth and seventeenth day of the camp, between the twenty-ninth and thirtieth day of the camp, and lastly, between the thirtieth and thirty-first day following the end of the camp). According to the results of this study, it was shown that the saliva melatonin concentration had increased rapidly during the initial three days once the camp had commenced, and further showed a gradual increase as the camp went on. However, once the camp had finished, the saliva melatonin concentration had come down to initial levels within 14 days. Furthermore, changes in saliva melatonin and urinary serotonin concentrations were observed in the longterm camp, while the saliva cortisol concentrations had not changed. Based on these facts, we reached the conclusion that the appearance and disappearance of the effects of this programme aimed at improving biorhythms were somewhat immediate. In addition, it can be considered that using melatonin and ⁄ or serotonin is an appropriate index for program verification.

長期キャンプ（30 泊 31 日）が子どもの生体リズムに及ぼす生化学的影響

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