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

Dados Bibliográficos

ID5219601
AutoresTaisuke Eto (0000-0002-0347-7408, Kyushu University, autor correspondente), Satoshi Kitamura (0000-0001-9607-1812, National Center of Neurology and Psychiatry), Kana Nishimura (Kyushu University), Kota Takeoka (Kyushu University), Yoko Nishimura (0000-0002-4172-0472, Kyushu University), Sue-Im Lee (0000-0001-8998-5827), Sang‐il Lee (0000-0002-1068-7542, Kyushu University), Masao Ohashi (0000-0002-8583-4471, Kyushu University), Akiko Shikano (0000-0001-8447-6476, Nippon Sport Science University), Shingo Noi (0000-0002-1902-7735, Nippon Sport Science University), Shigekazu Higuchi (0000-0001-7131-0792, Kyushu University)
Ano2022
Volume41
Fascículo1
Páginas42-42
Data de publicação2022-12-16
Peer ReviewedSim
Open AccessSim
TipoARTICLE
PeriódicoJournal of PHYSIOLOGICAL ANTHROPOLOGY (JOURNAL)
Identificadores do periódicoISSN: 1880-6791 • E-ISSN: 1880-6805
EditoraSpringer Science and Business Media LLC (PUBLISHER)
DOI10.1186/s40101-022-00316-x
PMID36527162
OpenAlexW4312066380
IdiomaEN
Citações recebidas2
Referências citadas43

Background It 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. Methods Twenty-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. Results DLMO 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. Conclusions Camping 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

Audiology · Circadian rhythm · Melatonin · Meteorology · Physics · Rhythm · Sunrise · Circadian rhythm and melatonin · Medicine · Psychology · Sleep and related disorders · Sleep and Work-Related Fatigue · Internal Medicine