Circadian Periodicity of Plasma Cortisol Levels in Members of Japanese Antarctic Research Expedition in Antarctic Region
With collaboration of the members of the 14th Japanese Antarctic Research Expedition (JARE), circadian rhythm of plasma cortisol levels was studied in 4 different seasons during a year. Blood specimens were obtained from 30 members at 22:00, 08:00, 12:00, 18:00 on each experimental day. Time-study w...
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National Institute of Polar Research
1976
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ftdoajarticles:oai:doaj.org/article:5fcb79ae65b34b6296ebd476421789fd 2023-05-15T13:56:33+02:00 Circadian Periodicity of Plasma Cortisol Levels in Members of Japanese Antarctic Research Expedition in Antarctic Region Seikichi TSUBOI Yoshiaki TODA Hisato YOSHIMURA Noboru SAKAMOTO Kazuo ASAHINA Hiroo IMURA 1976-12-01T00:00:00Z https://doi.org/10.15094/00007882 https://doaj.org/article/5fcb79ae65b34b6296ebd476421789fd EN JA eng jpn National Institute of Polar Research https://doi.org/10.15094/00007882 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00007882 0085-7289 2432-079X https://doaj.org/article/5fcb79ae65b34b6296ebd476421789fd Antarctic Record, Iss 57, Pp 97-105 (1976) Geography (General) G1-922 article 1976 ftdoajarticles https://doi.org/10.15094/00007882 2022-12-31T14:09:05Z With collaboration of the members of the 14th Japanese Antarctic Research Expedition (JARE), circadian rhythm of plasma cortisol levels was studied in 4 different seasons during a year. Blood specimens were obtained from 30 members at 22:00, 08:00, 12:00, 18:00 on each experimental day. Time-study was performed on the same days for all members. They had arbitrary daily schedules and sleeping times, except for several members in charge of machine maintenance, 3 weathermen and 2 correspondents, who followed their own fixed schedules. "Normal" circadian rhythm was observed on the days in March and September which have the same day-night cycles as in Japan. The rhythm was disturbed in June, the month of darkness throughout the day. In December, the season of midnight sun, the nyctohemeral rhythm was maintained although plasma cortisol levels were slightly elevated. The members of the machine maintenance group had "normal" rhythm at every period. The nightworkers had inverse rhythm at 4 different period. The circadian rhythm reexamined 4 days after changing the sleep-wake cycle showed the time shift according to the new sleep-wake period. These results suggest that the circadian rhythm of plasma cortisol levels depends on the sleep-wake cycle rather than on the day-night cycle. Article in Journal/Newspaper Antarc* Antarctic midnight sun Directory of Open Access Journals: DOAJ Articles Antarctic |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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English Japanese |
topic |
Geography (General) G1-922 |
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Geography (General) G1-922 Seikichi TSUBOI Yoshiaki TODA Hisato YOSHIMURA Noboru SAKAMOTO Kazuo ASAHINA Hiroo IMURA Circadian Periodicity of Plasma Cortisol Levels in Members of Japanese Antarctic Research Expedition in Antarctic Region |
topic_facet |
Geography (General) G1-922 |
description |
With collaboration of the members of the 14th Japanese Antarctic Research Expedition (JARE), circadian rhythm of plasma cortisol levels was studied in 4 different seasons during a year. Blood specimens were obtained from 30 members at 22:00, 08:00, 12:00, 18:00 on each experimental day. Time-study was performed on the same days for all members. They had arbitrary daily schedules and sleeping times, except for several members in charge of machine maintenance, 3 weathermen and 2 correspondents, who followed their own fixed schedules. "Normal" circadian rhythm was observed on the days in March and September which have the same day-night cycles as in Japan. The rhythm was disturbed in June, the month of darkness throughout the day. In December, the season of midnight sun, the nyctohemeral rhythm was maintained although plasma cortisol levels were slightly elevated. The members of the machine maintenance group had "normal" rhythm at every period. The nightworkers had inverse rhythm at 4 different period. The circadian rhythm reexamined 4 days after changing the sleep-wake cycle showed the time shift according to the new sleep-wake period. These results suggest that the circadian rhythm of plasma cortisol levels depends on the sleep-wake cycle rather than on the day-night cycle. |
format |
Article in Journal/Newspaper |
author |
Seikichi TSUBOI Yoshiaki TODA Hisato YOSHIMURA Noboru SAKAMOTO Kazuo ASAHINA Hiroo IMURA |
author_facet |
Seikichi TSUBOI Yoshiaki TODA Hisato YOSHIMURA Noboru SAKAMOTO Kazuo ASAHINA Hiroo IMURA |
author_sort |
Seikichi TSUBOI |
title |
Circadian Periodicity of Plasma Cortisol Levels in Members of Japanese Antarctic Research Expedition in Antarctic Region |
title_short |
Circadian Periodicity of Plasma Cortisol Levels in Members of Japanese Antarctic Research Expedition in Antarctic Region |
title_full |
Circadian Periodicity of Plasma Cortisol Levels in Members of Japanese Antarctic Research Expedition in Antarctic Region |
title_fullStr |
Circadian Periodicity of Plasma Cortisol Levels in Members of Japanese Antarctic Research Expedition in Antarctic Region |
title_full_unstemmed |
Circadian Periodicity of Plasma Cortisol Levels in Members of Japanese Antarctic Research Expedition in Antarctic Region |
title_sort |
circadian periodicity of plasma cortisol levels in members of japanese antarctic research expedition in antarctic region |
publisher |
National Institute of Polar Research |
publishDate |
1976 |
url |
https://doi.org/10.15094/00007882 https://doaj.org/article/5fcb79ae65b34b6296ebd476421789fd |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic midnight sun |
genre_facet |
Antarc* Antarctic midnight sun |
op_source |
Antarctic Record, Iss 57, Pp 97-105 (1976) |
op_relation |
https://doi.org/10.15094/00007882 https://doaj.org/toc/0085-7289 https://doaj.org/toc/2432-079X doi:10.15094/00007882 0085-7289 2432-079X https://doaj.org/article/5fcb79ae65b34b6296ebd476421789fd |
op_doi |
https://doi.org/10.15094/00007882 |
_version_ |
1766264043904958464 |