Interestingness: 1
Paper by Manfred Herold, Germaine Cornélissen, Mary Jo Rawson, George S. Katinas, Cheryl Alinder, Chris Bratteli, Denis Gubin, Franz Halberg in the Journal of Anti-Aging Medicine, Volume 3, Issue 3, Spring 2000.
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They analysed the melatonin and cortisol content of the saliva of five people 29-73 years of age for a week. They think there's a weekly cycle in melatonin, peaking on Tuesday. I'm close-minded.
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Abstract follows:
Circadian rhythms in circulating, urinary, salivary, pineal, pituitary and hypothalamic melatonin have been mapped. About weekly (circaseptan) rhythms, mapped previously in several other species, are demonstrated herein for human saliva, in individuals of widely differing ages. Whether or not the now demonstrated decrease with age in the circadian amplitude of human adults is accompanied by an increase in the circaseptan amplitude, as it is the case for blood pressure, remains to be determined.
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