Abstract |
The pineal hormone melatonin (MLT) is closely related to sleep initiation and maintenance in humans, and is now used as a potent therapeutic tool for some circadian rhythm sleep disorders. Acute and transient hypothermia induced by exogenously administered MLT (ex-MLT) may play a critical role in the circadian phase shifting and hypnogenic actions. Six healthy young male volunteers (mean age, 22.5 y; age range, 19-24 y), whose endogenous MLT secretion rhythms were previously assessed, took either 0.5 mg, 3 mg, or 9 mg of ex-MLT or a placebo at 0930 h (the average sleep onset time was 0000 h) on a randomized, single-blind, crossover basis. In comparison with placebo, ex-MLT significantly suppressed core body temperature at the 3-mg and 9-mg doses and slightly suppressed core body temperature at the 0.5-mg dose. There was significant positive correlation between the magnitude of core body temperature suppression and the area under the MLT concentration curve as well as the peak MLT concentration after ex-MLT administration. Our study showed that clinical doses of ex-MLT induce hypothermia in a dose-dependent manner. Results suggest that the therapeutic effect of larger doses of ex-MLT should be tested on patients who benefit little from typically lower clinical doses of ex-MLT.
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Authors | K Satoh, K Mishima |
Journal | Clinical neuropharmacology
(Clin Neuropharmacol)
2001 Nov-Dec
Vol. 24
Issue 6
Pg. 334-40
ISSN: 0362-5664 [Print] United States |
PMID | 11801808
(Publication Type: Clinical Trial, Journal Article, Randomized Controlled Trial, Research Support, Non-U.S. Gov't)
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Chemical References |
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Topics |
- Adult
- Body Temperature
(drug effects)
- Depression, Chemical
- Dose-Response Relationship, Drug
- Humans
- Male
- Melatonin
(administration & dosage, pharmacokinetics, pharmacology)
- Polysomnography
- Sleep
(drug effects)
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