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PubMedDate not supplied

Behavior and reproductive function of rat male offspring treated prenatally with 5-bromo-2'-deoxyuridine.

5-Bromo-2'-deoxyuridine (BrdU) was administered intraperitoneally to Sprague-Dawley rats at doses of 50 mg/kg/d on Days 9 through 15 and at 100 mg/kg/d on Days 16 through 20 of gestation. Dams were allowed to deliver naturally. Male offspring were subjected to a variety of pre- and postweaning behavioral tests: surface righting, negative geotaxis, open field test, Biel maze test, wheel cage test, and shuttlebox avoidance test. After puberty, masculine sexual behavior was observed. Male offspring of dams treated with BrdU on Days 9 through 15 of gestation showed an accelerated negative geotaxis reflex and increased ambulation and rearing in open field, while those of dams treated on Days 16 through 20 of gestation showed normal activity. Offspring of dams treated on Days 9 through 15 of gestation showed a higher activity level in the wheel cage than offspring of dams treated on Days 16 through 20 of gestation. In the Biel maze, offspring of dams treated on Days 9 through 15 of gestation showed impaired learning and memory. In the shuttlebox avoidance response, offspring of dams treated on Days 9 through 15 of gestation moved significantly more than offspring of dams treated on Days 16 through 20 of gestation. Masculine sexual behavior was markedly reduced in male offspring of dams treated on Days 9 through 15 of gestation. However, no significant differences between groups in blood pressure nor heart rate were noted. We conclude that male offspring of dams treated with BrdU on Days 9 through 15 of gestation are hyperactive without hypertension and that these offspring show an impairment of masculine sexual behavior, i.e., hyposexuality.

Analysis of Variance↗

PubMedDate not supplied

Ethanol exposure during the last week of gestation in the rat: inhibition of the prenatal testosterone surge in males without long-term alterations in sex behavior.

In utero ethanol exposure decreases the prenatal testosterone (T) surge in male rats. To determine the functional significance of this suppression, we measured sex behavior in adult litter representatives of pregnant rats that were administered a fortified liquid diet containing 35% ethanol-derived calories from day 15 of gestation through parturition. Control dams were pair-fed an isocaloric liquid diet with the ethanol calories replaced by sucrose. Results from the behavioral studies showed that gonadally intact fetal alcohol-exposed (FAE) males exhibited little masculine sex behavior in the first of four weekly sessions. However, their behavior in the subsequent three tests was indistinguishable from pair-fed controls. Lordosis quotients in the same males following castration and estrogen and progesterone treatment were under 10%. In castrated FAE females, no effects of prenatal ethanol exposure were observed in masculine behaviors following androgen replacement or feminine sex behaviors following estrogen and progesterone replacement. Additional studies measured the duration of prenatal ethanol exposure necessary to inhibit the prenatal T surge in order to determine whether the inhibition was due to a direct effect of the drug. Results revealed an inhibition of the surge in males exposed to ethanol from days 14 through 20 of pregnancy, days 14 through 16 of pregnancy, or days 17 through 20 of pregnancy. A normal surge of T was observed on days 18-19 of gestation in control fetuses. These findings indicate that ethanol does not have to be present in blood at the time of the surge to have an inhibitory effect. They also reveal that the surge can be inhibited with as little as 24-36 h of ethanol exposure prior to its normal appearance on day 18 of gestation. In spite of this inhibition of the prenatal T surge, the behavioral results indicate that normal masculinization and defeminization of sex behavior occurs in FAE males exposed to ethanol after the beginning of the period of differentiation of the hypothalamus and testes.

Animals↗

PubMed2002

Alcohol dependence and gender-role orientation.

OBJECTIVE: The overall increase of female alcoholism is supposed to be associated with the change of the traditional female role, and it is especially seen as a consequence of role convergence or gender-role conflicts. The aim of the present pilot study is to explore whether the approach of gender-role orientation would be empirically useful in contributing to these hypotheses. METHOD: One hundred twelve patients with alcohol dependence meeting DSM-III-R criteria were explored after detoxification; gender-role orientation was measured by a German version of the "Extended Personal Attributes Questionnaire", categorising gender-role orientation into four subgroups: masculine, feminine, androgynous, and undifferentiated. RESULTS: In comparison with a population-based sample, there are significant differences in the distribution of the four subgroups of gender-role orientation, showing a predominance of the undifferentiated self-concept in the alcoholic sample (49%). Alcoholic females describe themselves as rather undifferentiated, and rather feminine than masculine. Low masculinity and low femininity, as well as high femininity, correlate positively with distress, depressiveness, social anxiety, insecurity and concomitant personality disorders. CONCLUSION: Our data do not support the convergence hypothesis related to gender-role orientation, but support the traditional feminine self-concept as an unspecific risk factor for vulnerability. The question whether an undifferentiated self-concept could be a specific risk factor for alcoholism is discussed.

Adult↗

PubMed2001

Gender attitudes and health risk behaviors in urban African American and Latino early adolescents.

OBJECTIVES: This study examines the association of beliefs about gender differences (frequently termed gender attitudes or attitudes about women in other research) and of beliefs specifically about masculinity to health risk behaviors in minority, urban, early adolescents, in light of the "gender conventionality" hypothesis. METHODS: Data from a self-administered questionnaire assessing gender attitudes and violence-related, substance use, and heterosexual health risk behaviors administered to 587 African American and Latino early adolescents are analyzed. RESULTS: With sociodemographic and family variables controlled, in males violence-related behaviors and substance use are associated with traditional beliefs about masculinity, and heterosexual activity is associated with traditional beliefs about gender differences. In females, being sexually active is positively associated with traditional beliefs about masculinity. CONCLUSIONS: Interventions to reduce health risk behaviors in minority, urban, early adolescents may be more effective if they include greater attention to ways in which gender-related attitudes may play a role in health risk taking.

Adolescent↗

PubMed1983

Sex role identity and the decision to regain control among women: a learned helplessness investigation.

In an investigation focusing on women's attempts to regain control of their environments, women from four sex role identity groups underwent either an initial loss of control (helpless) or control (nonhelpless) experience. Subsequently, they were allowed to choose their role in a team problem-solving task. They could either (a) have total control over the team's decisions, (b) have no control over the team's decisions, or (c) not participate in the task. Compared to women low on masculinity, women high on masculinity chose to be in control of team problem-solving in both the helpless and nonhelpless conditions. Particularly striking, none of the 14 feminine-sex-typed women chose to control the team's decisions in the helpless condition, whereas 10 of the 14 masculine-sex-typed women made this choice. Results are discussed relative to the high rates of depression among women.

Decision Making↗

PubMed1985

Relation between testosterone concentration, sex role identity, and personality among females.

Eighty-four undergraduate female students completed Baucom's Masculinity and Femininity Scales, the Bem Sex Role Inventory, and the Adjective Check List. Testosterone concentration was determined from saliva samples provided by the women. The results indicated that sex role type was related to level of testosterone concentration. More specifically, undifferentiated females had much higher levels of testosterone concentration than did the feminine-sex-typed females. Also, females with high levels of masculinity (androgynous and masculine-sex-typed females combined) had somewhat higher testosterone levels than did feminine-sex-typed females. Adjectival correlates indicated that females with higher testosterone concentrations perceive themselves as self-directed, action-oriented, resourceful individuals; women with lower testosterone concentration view themselves as conventional, socialized individuals, possessing a caring attitude coupled with an anxious and dejected mood.

Adult↗

PubMed1987

Sex roles and social support as moderators of life stress adjustment.

In this study we used a longitudinal design to test the stress-buffering effects of sex role orientation in combination with perceived social support on measures of trait anxiety and depression. College undergraduates served as subjects. The cross-sectional analyses provided strong support for the hypothesis that masculinity would function as a life stress buffer. The hypothesis that social support would serve as a stress buffer when coupled with high masculinity was supported by one of the cross-sectional analyses as well as the longitudinal analysis. This pattern was found primarily for perceptions of tangible social support. The longitudinal analysis also revealed a significant interaction involving negative life events and masculinity and femininity. This interaction effect provided unexpected support for a balance model of androgyny, in that non-sex-typed subjects showed greater resilience to recent life stress than did sex-typed subjects. The findings are discussed in terms of their implications for the study of life stress adjustment.

Adolescent↗

PubMed1987

"Eating lightly" and the self-presentation of femininity.

In Experiment 1, male and female subjects were given an opportunity to snack as they participated in a "get-acquainted study" with a same-sex or opposite-sex partner (confederate) whose social desirability was manipulated. Consistent with the hypothesis that women may eat less when motivated to present themselves in a feminine light, female subjects ate significantly less with a desirable male partner than in the remaining three conditions. In contrast, male subjects did not eat more (or less) with a desirable woman, although they did show an overall tendency to eat less with female (vs. male) partners. In Experiment 2, female subjects snacked as they got acquainted with a desirable male partner (confederate). Before this interaction, subjects received feedback indicating that they had either very masculine or very feminine interests. In addition, subjects believed either that their male partner was aware of their gender feedback or that he was unaware. Consistent with predictions derived from Schlenker's (1982) analytic-identity theory of social conduct, subjects in the partner-aware conditions ate less when they had received masculine (vs. feminine) feedback, whereas subjects in the partner-unaware conditions ate less when they had received feminine (vs. masculine) feedback. Implications for understanding eating disorders such as anorexia and bulimia are discussed.

Adult↗

PubMed1990

Stereotypic and nonstereotypic sex role trait and behavior orientations, gender identity, and psychological adjustment.

This study examines the relations among sex role trait and behavior orientations, gender identity, and psychological adjustment in order to test traditional and contemporary perspectives regarding the adjustment implications of stereotypic and nonstereotypic sex role trait and behavior orientations. Measures of sex role personality traits and behaviors and scales assessing depression, anxiety, and social maladjustment were administered to 235 college men and women. In addition, subjects completed measures of gender identity and gender adequacy. Contrary to traditional perspectives, androgynous men and women and cross-sex-typed women were no less well adjusted than sex-typed individuals. However, consistent with traditional perspectives, men who were low in masculine characteristics (and men and women low in both masculine and feminine characteristics) did appear less well adjusted on measures of depression, anxiety, and social maladjustment. Furthermore, low masculinity men had less secure gender identities. No such gender identity disturbances were found in women.

Adaptation, Psychological↗

PubMed1997

Butch, femme, or straight acting? Partner preferences of gay men and lesbians.

On average, gay men are somewhat feminine and lesbians somewhat masculine, but there is variation within each group. The authors examined the consequences of this variation for gay men's and lesbians' desirability as romantic partners. In 2 studies the authors analyzed personal advertisements. Homosexual people were more likely than heterosexual people to mention traits related to sex typicality and more likely to request sex-typical than sex-atypical partners. In 2 studies the authors assessed partner preferences directly. On average, gay men preferred men who described themselves as masculine rather than feminine, but this preference was weaker among men who rated themselves as relatively feminine. Lesbians preferred women who described themselves as feminine looking but did not discriminate against women calling themselves masculine acting. The authors discuss implications of the results for theories of sexual orientation and the adjustment of sex-atypical homosexual people.

Adult↗

PubMed1999

Feminized management and backlash toward agentic women: the hidden costs to women of a kinder, gentler image of middle managers.

Women who display masculine, agentic traits are viewed as violating prescriptions of feminine niceness (L. A. Rudman, 1998). By legitimizing niceness as an employment criterion, "feminization" of management (requiring both agentic and communal traits for managers) may unintentionally promote discrimination against competent women. Participants made hiring recommendations for a feminized or masculine managerial job. Agentic female job applicants were viewed as less socially skilled than agentic males, but this perception only resulted in hiring discrimination for the feminized, not the masculine, job. Communal applicants (regardless of sex) invariably received low hiring ratings. Thus, women must present themselves as agentic to be hireable, but may therefore be seen as interpersonally deficient. Ironically, the feminization of management may legitimize discrimination against competent, agentic women.

Administrative Personnel↗

PubMed1991

Sex differences in cardiovascular reactivity: effects of the gender relevance of the stressor.

Suggests that sex differences in cardiovascular reactivity (CVR) in past research are a function of differences in cognitive appraisal of stressors as masculine or feminine tasks. In the present study, we examined the role of the gender relevance of the stressor as a mediator of sex differences in CVR. The CVR of male and female college students (n = 95) to the cold pressor test (CPT) was compared under masculine and gender-neutral instructions during an anticipation phase, a stressor phase, and a recovery phase. Men were expected to show greater CVR than women to the masculine CPT but not to the gender-neutral CPT. Results supported this prediction for systolic blood pressure reactivity and heart rate reactivity but not for diastolic blood pressure reactivity. The potential influence of sex differences in appraisal of situations on CVR and coronary heart disease is discussed.

Adolescent↗

PubMed1987

Neonatal testosterone propionate treatment in the female gerbil: morphological and behavioral effects.

The present experiment examined the effects of a single neonatal injection of 1 mg or 100 micrograms of testosterone propionate (TP) on the sexual behavior and morphology of the female Mongolian gerbil. Four groups were created: vehicle-treated males (VM), 1-mg TP-treated females (HTP), 100-micrograms TP-treated females (LTP), and vehicle-treated females (VF). In adulthood, tests of sexual behavior were carried out after gonadectomy and appropriate hormone replacement therapy. Results indicated that LTP, HTP, and VM animals were significantly less receptive than VF animals. In addition, VM animals displayed significantly more male sexual activity than HTP, LTP, or VF animals. Immediately after the final test for male sexual behavior, subjects were weighed, anogenital distances recorded, and scent glands measured (length and width). Results indicated that a significant degree of morphological masculinization had occurred in HTP subjects for all measures and for LTP subjects for scent gland width and anogenital distance. These findings suggest that in the gerbil, significant morphological masculinization and behavioral defeminization can both occur in teh absence of significant behavioral masculinization.

Animals↗

PubMed2002

The myth of sameness among Latino men and their machismo.

This study examined the construct of machismo in relationship to measures of machismo, masculinity, and gender role identity. One hundred forty-eight Latino men with an average age of 36, primarily Mexican American and Puerto Rican, participated. Results indicate that machismo can be characterized as a multidimensional construct, and cluster analyses found that traditional definitions of machismo as authoritarian, emotionally restrictive, and controlling represented only about 10% of the classified Latinos. Most of the sample identified with more emotionally responsive, collaborative, and flexible masculinity styles. Five identity dimensions identified were Contemporary Masculinity, Machismo, Traditional Machismo, Conflicted/Compassionate Machismo, and Contemporary Machismo. Implications include the need to change stereotypes of machismo to be more congruent with the variation in Latino male identity.

Adult↗

PubMed2003

Prenatal androgens and gender-typed behavior: a study of girls with mild and severe forms of congenital adrenal hyperplasia.

Gender-typed behaviors and interests were investigated in 26 girls, aged 2-10 years, affected with congenital adrenal hyperplasia (CAH) and in 26 unaffected girls matched for age. Girls with CAH were more interested in masculine toys and less interested in feminine toys and were more likely to report having male playmates and to wish for masculine careers. Parents of girls with CAH rated their daughters' behaviors as more boylike than did parents of unaffected girls. A relation was found between disease severity and behavior indicating that more severely affected CAH girls were more interested in masculine toys and careers. No parental influence could be demonstrated on play behavior, nor did the comparison of parents' ratings of wished for behavior versus perceived behavior in their daughters indicate an effect of parental expectations. The results are interpreted as supporting a biological contribution to differences in play behavior between girls with and without CAH.

Adrenal Hyperplasia, Congenital↗

PubMed2002

Change and stability in managers' gender roles.

The author examined gender roles among midlife managers over a 4-year period and the effects of career experiences. The findings supported a conceptualization of personality as relatively enduring but still open to change. Masculinity and femininity demonstrated differential stability and absolute stability, except in the case of women's femininity. Its magnitude decreased. At the same time, income change, promotion, and having a protege were associated with increased masculinity and income change with increased femininity. A new child also meant increased masculinity for men. Furthermore, income change, promotion, turnover, being mentored, and having a protege affected the relative placements of managers' scores over time. Many of the effects were different for men and women. The findings have important implications for adult development in the workplace.

Adult↗

PubMed1975

Hormonal basis of sexual differentiation in the Japanese quail.

On the 10th day of incubation, Japanese quail eggs either were injected with testosterone propionate (TP), estradiol benzoate (EB), or oil, or were not injected. When sexually mature, all birds were examined for a variety of sexually dimorphic behavioral and physical characteristics, both masculine and feminine. They were then exposed to a short photoperiod (causing gonadal regression), treated with either TP or EB, and examined again. Either androgen or estrogen administered before hatching demasculinized males, but did not masculinize females or defeminize either sex. In contrast, early sex hormones masculinize and/or or defeminize mammals. This difference is discussed in relation to other differences in avian and mammalian sexuality.

Age Factors↗

PubMed1990

The episodic secretory pattern of growth hormone regulates liver carbonic anhydrase III. Studies in normal and mutant growth-hormone-deficient dwarf rats.

Carbonic anhydrase III (CAIII) occurs in male rat liver at concentrations twenty times those in the female, and is sensitive to the pattern of growth hormone (GH) release. Males release GH episodically and have high concentrations of CAIII; females produce GH in a more continuous fashion and have lower CAIII levels. In normal female rats, the endogenous GH secretory pattern was masculinized, either by regular injections of GH-releasing factor (GRF) or by intermittent infusions of somatostatin (90 min on/90 min off). Both treatments induced regular GH pulses and stimulated growth, but only intermittent somatostatin infusions raised CAIII levels (controls, 1.5 +/- 0.5; somatostatin-treated, 9.0 +/- 2.9 micrograms/mg; means +/- S.D.). GRF pulses (4 micrograms every 4 h) did not however raise CAIII levels (controls 1.8 +/- 0.5; GRF-treated 1.4 +/- 0.4 micrograms/mg). Surprisingly, hepatic CAIII is also sexually dimorphic (males, 18.8 +/- 3; females, 2.22 +/- 0.4 micrograms/mg) in a GH-deficient dwarf rat strain which has low plasma GH levels without 3-hourly GH peaks. Intermittent somatostatin infusions in female dwarf rats partially masculinized hepatic CAIII, an effect reduced by co-infusion with GRF. This CAIII response was not secondary to growth induction, since neither somatostatin nor GRF stimulated growth in dwarf rats, and pulses of exogenous GH stimulated growth in female dwarfs without masculinizing CAIII levels. Furthermore, continuous GH infusion in male dwarf rats partially feminized hepatic CAIII levels (to 9.1 +/- 2.4 micrograms/mg), whereas infusions of insulin-like growth factor-1, which induced the same body weight gain, did not affect hepatic CAIII (20.8 +/- 6 micrograms/mg). These results show that hepatic CAIII expression is highly sensitive to the endogenous GH secretory pattern, independent of growth. They also implicate the low basal GH levels between pulses, rather than the peak GH levels, as the primary determinant of the sexually dimorphic hepatic CAIII expression in the rat.

Animals↗