We use fluctuations of female sex hormones occurring naturally over the menstrual cycle or induced by hormonal contraceptives to determine the importance of sex hormones in explaining gender differences in competitiveness. Participants in a laboratory experiment solve a simple arithmetics task first under a piece rate and then under a competitive tournament scheme. Subjects can then choose whic...

BACKGROUND AND AIMS The association of hepatic haemangiomas with female sex hormones is not entirely clear. We prospectively evaluated the impact of female sex hormones on the natural history of liver haemangiomas. METHODS We followed 94 women with 181 haemangiomas diagnosed by ultrasound for a period of1-17 years (mean 7.3 (5.5) years). The location, number, size, and ultrasonographic patter...

The effect of diethylstilboestrol (DES; 0.5 mg/100 g) and progesterone (2.5 mg/100 g) was studied on the catecholamine content of adrenals and uteri of seven day ovariectomized albino rats. The agents were administered i.p. on alternate days for one week and the tissue catecholamine content was determined spectrophoto fluorometrically. DES treatment increased the total adrenaline contents of ad...

It has been suggested that human scent works as a signal in mate selection, but the empirical evidence is scarce. Here, we examined whether women’s olfactory preferences for a man’s scent could be correlated with his testosterone, estradiol, or cortisol concentrations, and whether these preferences change along with the menstrual cycle. In line with previous studies, women in their most fertile...

The current study aimed to evaluate the effects of oral administration spirulina (as a food supplement) on reproductive performance adult female rabbits. Female rabbits (16 18 weeks old) were divided into three groups (10 rabbits/ group). These are: (Gr.I) as control group and (Gr. II) was given at dose (0.5 g / kg body weight) III) complex folic acid, B6 B12 (2.5 + 50 +1 mg all treated for fou...

Immune function is better in females than in males of many vertebrate species, and this dimorphism has been attributed to the presence of immunosuppressive androgens in males. We investigated the influence of sex steroid hormones on immune function in male and female Siberian hamsters. Previous studies indicated that immune function was impaired in male and female hamsters housed under short-da...

Female sex hormones have long been suspected to have an effect on mast cell (MC) behavior. This assumption is based on the expression of hormone receptors in MCs as well as on the fact that many MC-related pathophysiological alterations have a different prevalence in females than in males. Further, serum IgE levels are much higher in allergic female mice compared to male mice. Ovariectomized ra...

Introduction: During the menstrual cycle, women are exposed to continual variations in serum concentrations of various female sex steroid hormones. The fluctuations main hormones, estrogen, progesterone, follicle stimulating hormone and luteinizing hormone, essential for regulating ovulatory cycle patterns. In this sense, it is speculated that strength training can stimulate signaling pathways ...

Gonadal hormones (e.g., estradiol) may regulate feeding by producing a shift in the taste or palatability of food items. This study examined the impact of endogenous gonadal hormones on palatability by investigating sex differences in taste responsivity, as well as the effect of the estrous cycle on taste responsivity, in a rodent model. In the taste reactivity test, male and female Long-Evans ...

In order to clarify the functional relationship between thyroid, adrenal and gonadal hormones, hypothyroidism was induced by administration of thiuoracil in adult male and female rats, and the effects of hypothyroidism on the adrenal and the gonadal axes were investigated in the present study. 1. The functional relationship between thyroid and adrenal hormones: Adrenal weights and corticosteron...