Diurnal rhythms of urine volume and electrolyte excretion in healthy young men under differing intensities of daytime light exposure

Abstract In humans, most renal functions, including urine volume and electrolyte excretions, have a circadian rhythm. Light is a strong circadian entrainment factor and daytime-light exposure is known to affect the circadian rhythm of rectal temperature (RT). The effects of daytime-light exposure on...

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Autores principales:	Isuzu Nakamoto, Sayaka Uiji, Rin Okata, Hisayoshi Endo, Sena Tohyama, Rina Nitta, Saya Hashimoto, Yoshiko Matsushima, Junko Wakimoto, Seiji Hashimoto, Yukiko Nishiyama, Dominika Kanikowska, Hiromitsu Negoro, Tomoko Wakamura
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/48240dd68d564f8b90af00c456dac524
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spelling	oai:doaj.org-article:48240dd68d564f8b90af00c456dac5242021-12-02T16:07:04ZDiurnal rhythms of urine volume and electrolyte excretion in healthy young men under differing intensities of daytime light exposure10.1038/s41598-021-92595-02045-2322https://doaj.org/article/48240dd68d564f8b90af00c456dac5242021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-92595-0https://doaj.org/toc/2045-2322Abstract In humans, most renal functions, including urine volume and electrolyte excretions, have a circadian rhythm. Light is a strong circadian entrainment factor and daytime-light exposure is known to affect the circadian rhythm of rectal temperature (RT). The effects of daytime-light exposure on the diurnal rhythm of urinary excretion have yet to be clarified. The aim of this study was to clarify whether and how daytime exposure to bright-light affects urinary excretions. Twenty-one healthy men (21–27 years old) participated in a 4-day study involving daytime (08:00–18:00 h) exposure to two light conditions, Dim (< 50 lx) and Bright (~ 2500 lx), in a random order. During the experiment, RT was measured continuously. Urine samples were collected every 3 ~ 4 h. Compared to the Dim condition, under the Bright condition, the RT nadir time was 45 min earlier (p = 0.017) and sodium (Na), chloride (Cl), and uric acid (UA) excretion and urine volumes were greater (all p < 0.001), from 11:00 h to 13:00 h without a difference in total daily urine volume. The present results suggest that daytime bright light exposure can induce a phase shift advance in urine volume and urinary Na, Cl, and UA excretion rhythms.Isuzu NakamotoSayaka UijiRin OkataHisayoshi EndoSena TohyamaRina NittaSaya HashimotoYoshiko MatsushimaJunko WakimotoSeiji HashimotoYukiko NishiyamaDominika KanikowskaHiromitsu NegoroTomoko WakamuraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Isuzu Nakamoto Sayaka Uiji Rin Okata Hisayoshi Endo Sena Tohyama Rina Nitta Saya Hashimoto Yoshiko Matsushima Junko Wakimoto Seiji Hashimoto Yukiko Nishiyama Dominika Kanikowska Hiromitsu Negoro Tomoko Wakamura Diurnal rhythms of urine volume and electrolyte excretion in healthy young men under differing intensities of daytime light exposure
description	Abstract In humans, most renal functions, including urine volume and electrolyte excretions, have a circadian rhythm. Light is a strong circadian entrainment factor and daytime-light exposure is known to affect the circadian rhythm of rectal temperature (RT). The effects of daytime-light exposure on the diurnal rhythm of urinary excretion have yet to be clarified. The aim of this study was to clarify whether and how daytime exposure to bright-light affects urinary excretions. Twenty-one healthy men (21–27 years old) participated in a 4-day study involving daytime (08:00–18:00 h) exposure to two light conditions, Dim (< 50 lx) and Bright (~ 2500 lx), in a random order. During the experiment, RT was measured continuously. Urine samples were collected every 3 ~ 4 h. Compared to the Dim condition, under the Bright condition, the RT nadir time was 45 min earlier (p = 0.017) and sodium (Na), chloride (Cl), and uric acid (UA) excretion and urine volumes were greater (all p < 0.001), from 11:00 h to 13:00 h without a difference in total daily urine volume. The present results suggest that daytime bright light exposure can induce a phase shift advance in urine volume and urinary Na, Cl, and UA excretion rhythms.
format	article
author	Isuzu Nakamoto Sayaka Uiji Rin Okata Hisayoshi Endo Sena Tohyama Rina Nitta Saya Hashimoto Yoshiko Matsushima Junko Wakimoto Seiji Hashimoto Yukiko Nishiyama Dominika Kanikowska Hiromitsu Negoro Tomoko Wakamura
author_facet	Isuzu Nakamoto Sayaka Uiji Rin Okata Hisayoshi Endo Sena Tohyama Rina Nitta Saya Hashimoto Yoshiko Matsushima Junko Wakimoto Seiji Hashimoto Yukiko Nishiyama Dominika Kanikowska Hiromitsu Negoro Tomoko Wakamura
author_sort	Isuzu Nakamoto
title	Diurnal rhythms of urine volume and electrolyte excretion in healthy young men under differing intensities of daytime light exposure
title_short	Diurnal rhythms of urine volume and electrolyte excretion in healthy young men under differing intensities of daytime light exposure
title_full	Diurnal rhythms of urine volume and electrolyte excretion in healthy young men under differing intensities of daytime light exposure
title_fullStr	Diurnal rhythms of urine volume and electrolyte excretion in healthy young men under differing intensities of daytime light exposure
title_full_unstemmed	Diurnal rhythms of urine volume and electrolyte excretion in healthy young men under differing intensities of daytime light exposure
title_sort	diurnal rhythms of urine volume and electrolyte excretion in healthy young men under differing intensities of daytime light exposure
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/48240dd68d564f8b90af00c456dac524
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Diurnal rhythms of urine volume and electrolyte excretion in healthy young men under differing intensities of daytime light exposure

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