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Gender variation in leptin circadian rhythm and pulsatility in adult growth hormone deficiency: effects of growth hormone replacement

objectives Adult growth hormone deficiency (AGHD) is characterized by obesity and associated with increased leptin concentration and decreased leptin pulsatility. Growth hormone replacement (GHR) results in a decrease in leptin concentration and increase in leptin pulsatility, followed by reduction in body fat mass (BFM). In both health and AGHD, women exhibit relatively higher leptin concentrations compared to men. The effect of gender on leptin rhythm and pulse parameters in AGHD is yet to be defined and the gender difference in the response of leptin secretory pattern to GHR has not been determined. Therefore the aim of this study was to evaluate the effect of gender on circadian and pulse parameters of leptin secretion in AGHD, and examine the gender variation in response of these parameters to GHR.