Circadian phase advances in children during camping life according to the natural light-dark cycle

Journal of Physiological Anthropology

Original Article

Shigekazu Higuchi¹  Sang-il Lee²  Shingo Kitamura³  Akiko Shikano⁴  Shingo Noi⁴  Kota Takeoka⁵  Kana Nishimura⁵  Taisuke Eto⁶  Yuki Nishimura⁷  Michihiro Ohashi⁸ 

[1] Department of Human Science, Faculty of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, 815-8540, Fukuoka, Japan;Department of Human Science, Faculty of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, 815-8540, Fukuoka, Japan;Laboratory of Environmental Ergonomics, Faculty of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, 060-8628, Sapporo, Hokkaido, Japan;Department of Sleep-Wake Disorders, National Institute of Mental Health, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, 187-8553, Tokyo, Japan;Faculty of Sport Science, Nippon Sport Science University, 7-1-1 Fukasawa, Setagaya-ku, 158-8508, Tokyo, Japan;Graduate School of Integrated Frontier Sciences, Kyushu University, 4-9-1 Shiobaru, Minami-ku, 815-8540, Fukuoka, Japan;Graduate School of Integrated Frontier Sciences, Kyushu University, 4-9-1 Shiobaru, Minami-ku, 815-8540, Fukuoka, Japan;Department of Human Science, Faculty of Design, Kyushu University, 4-9-1 Shiobaru, Minami-ku, 815-8540, Fukuoka, Japan;Research Fellow of the Japan Society for the Promotion of Science, 4-9-1 Shiobaru, Minami-ku, 815-8540, Fukuoka, Japan;Department of Sleep-Wake Disorders, National Institute of Mental Health, National Center of Neurology and Psychiatry, 4-1-1 Ogawa-Higashi, Kodaira, 187-8553, Tokyo, Japan;Graduate School of Integrated Frontier Sciences, Kyushu University, 4-9-1 Shiobaru, Minami-ku, 815-8540, Fukuoka, Japan;Occupational Stress and Health Management Research Group, National Institute of Occupational Safety and Health, 6-21-1 Nagao, Tama-ku, 214-8585, Kawasaki, Kanagawa, Japan;Graduate School of Integrated Frontier Sciences, Kyushu University, 4-9-1 Shiobaru, Minami-ku, 815-8540, Fukuoka, Japan;Research Fellow of the Japan Society for the Promotion of Science, 4-9-1 Shiobaru, Minami-ku, 815-8540, Fukuoka, Japan;

关键词: Circadian rhythm;    Melatonin;    Children;    Sleep;    Camping;    Lighting;    Physiology;    Photoperiods;    Non-image forming effect;   

DOI  :  10.1186/s40101-022-00316-x

 received in 2022-08-21, accepted in 2022-12-06,  发布年份 2022

来源: Springer

【 摘 要 】

BackgroundIt is known that the circadian rhythm phase in adults can be advanced in a natural light-dark cycle without electrical lighting. However, the effect of advanced sleep-wake timing according to the natural light-dark cycle on children’s circadian phase is unclear. We investigated the effects of approximately 2 weeks of camping life with little access to artificial lighting on children’s circadian phases. We also conducted an exploratory examination on the effects of wake time according to natural sunrise time on the manner of the advance of their circadian phases.MethodsTwenty-one healthy children (mean ± SD age, 10.6 ± 1.4 years) participated in a camping program with wake time (4:00) being earlier than sunrise time (EW condition), and 21 healthy children (10.4 ± 1.1 years) participated in a camping program with wake time (5:00) being almost matched to sunrise time (SW condition). Salivary dim light melatonin onset (DLMO) before the camping program and that after approximately 2 weeks of camping were compared.ResultsDLMO was advanced by approximately 2 h after the camping program compared with the circadian phase in daily life in both conditions. In addition, the advances in DLMO were significantly correlated with mid-sleep points before the camp in both conditions (EW: r = 0.72, p < 0.01, SW: r = 0.70, p < 0.01). These correlations mean that the phase advance was greater for the children with delayed sleep habits in daily life. Furthermore, in the EW condition, mean DLMO after the camp (18:09 ± 0:33 h) was earlier than natural sunset time and there was no significant decrease in interindividual variability in DLMO. On the other hand, in the SW condition, mean DLMO after the camp (18:43 ± 0:20 h) matched natural sunset time and interindividual variability in DLMO was significantly lower than that before the camp.ConclusionsCamping with advanced sleep and wake timing under natural sunlight advances children’s circadian phases. However, DLMO earlier than sunset in an early waking condition may lead to large interindividual variability in the circadian rhythm phase.

【 授权许可】

CC BY   
© The Author(s) 2022

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