Twenty-Four-Hour Rhythms in Relation to the Natural Photoperiod: A Field Study in Humans

The daily rhythms of salivary melatonin, salivary cortisol, and axillary body temperature were measured in nine healthy volunteers in midsummer, around the autumn equinox, and in midwinter, at a latitude of 60°N. The aim was to find out whether these rhythms were dependent on variations of the natur...

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Bibliographic Details
Published in:Journal of biological rhythms 1994, Vol.9 (3-4), p.283-293
Main Authors: Laakso, Maija-Liisa, Porkka-Heiskanen, Tarja, Alila, Aino, Stenberg, Dag, Johansson, Gunnar
Format: Article
Language:English
Subjects:
Adult
Axilla - physiology
Body Temperature
Circadian Rhythm
Female
Humans
Hydrocortisone - metabolism
Light
Male
Melatonin - metabolism
Middle Aged
Photoperiod
Saliva - metabolism
Seasons
Space life sciences
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Summary:The daily rhythms of salivary melatonin, salivary cortisol, and axillary body temperature were measured in nine healthy volunteers in midsummer, around the autumn equinox, and in midwinter, at a latitude of 60°N. The aim was to find out whether these rhythms were dependent on variations of the natural daylength. The samples were collected every 2 hr during 24-hr periods in everyday conditions. The individual rhythms were characterized with the acrophase estimates of the best-fitting cosine curve models and with the half-rise and half-decline times calculated from the raw data. The melatonin and cortisol rhythms were delayed significantly (about 1 hr) in midwinter as compared with summer and autumn. The most advanced rhythms were found in autumn. The shifts of the melatonin and cortisol rhythms could be explained as a result of the changes of natural illumination. The overt temperature rhythms did not differ significantly among the sampling months. The lack of seasonal patterns in temperature rhythms probably primarily reflected the socially determined rest-activity cycles of the subjects.
ISSN:0748-7304
1552-4531
DOI:10.1177/074873049400900309