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Reduced fat mass and increased lean mass in response to 1 year of melatonin treatment in postmenopausal women: A randomized placebo‐controlled trial
Author(s) -
Amstrup Anne Kristine,
Sikjaer Tanja,
Pedersen Steen B.,
Heickendorff Lene,
Mosekilde Leif,
Rejnmark Lars
Publication year - 2016
Publication title -
clinical endocrinology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 147
eISSN - 1365-2265
pISSN - 0300-0664
DOI - 10.1111/cen.12942
Subject(s) - melatonin , medicine , endocrinology , placebo , postmenopausal women , fat mass , lean body mass , randomized controlled trial , body mass index , body weight , alternative medicine , pathology
Summary Objective Apart from regulating the circadian rhythm, melatonin exerts a variety of actions in the living organism. Among these functions, melatonin is believed to have a positive effect on body weight and energy metabolism. So far, the evidence for this relies mainly on animal models. In this study, we aimed to determine the effects of melatonin on body composition, lipid and glucose metabolism in humans. Design/methods In a double‐blind, placebo‐controlled study, we randomized 81 postmenopausal women to 1 year of treatment with melatonin (1 or 3 mg nightly) or placebo. Body composition was measured by DXA . Measures were obtained at baseline and after 1 year of treatment along with leptin, adiponectin and insulin. Markers of glucose homeostasis were measured at the end of the study. Results In response to treatment, fat mass decreased in the melatonin group by 6·9% (95% CI : 1·4%; 12·4%, P = 0·02) compared to placebo. A borderline significant increase in lean mass of 5·2% was found in the melatonin group compared to placebo (3·3%, ( IQR :−1·7; 6·2) vs −1·9%, ( IQR : −5·7; 5·8), P = 0·08). After adjusting for BMI , lean mass increased by 2·6% (95% CI : 0·1; 5·0, P = 0·04) in the melatonin group. Changes in body weight and BMI did not differ between groups. Adiponectin increased borderline significantly by 21% in the melatonin group compared to placebo ( P = 0·08). No significant changes were observed for leptin, insulin or markers of glucose homeostasis. Conclusion Our results suggest a possibly beneficial effect of melatonin on body composition and lipid metabolism as 1 year of treatment reduces fat mass, increases lean mass and is associated with a trend towards an increase in adiponectin.