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Sex and adolescence.

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Abortion, Induced↗
PubMed1992

School-based programs to reduce sexual risk-taking behaviors.

This article reviews the major approaches implemented during the last two decades to reduce sexual risk-taking behaviors, examines their evidence for success, and provides several recommendations for effective programs and program evaluations. This article does not discuss more broad-based sexuality education programs which address sexuality in a broader context. Instead, this article focuses primarily on programs that educators believed would reduce unprotected sexual intercourse.

Adolescent↗
PubMed1999

Role of leptin in women with eating disorders.

OBJECTIVE: This study investigated the role of leptin on eating behavior and reproductive function in eating disorders. METHOD: The subjects included 80 eating-disordered women, having different fat mass, eating behavior, and endocrine abnormalities, and 26 control women. Plasma leptin, insulin, luteinizing hormone (LH), follicle-stimulating hormone (FSH), cortisol, insulin growth factor-1 (IGF-1), free T4 levels, percent body fat, eating behavior score, and menstrual status score were evaluated for each subject. RESULTS: In eating-disordered patients, log of leptin levels were significantly correlated with body fat mass, eating behavior score, menstrual status score, and insulin, LH, and FSH levels. Stepwise regression analysis showed that fat mass and eating behavior score were significant determinants of leptin levels. Furthermore, in patients undergoing recovery, leptin levels were determined by fat mass and/or eating behavior. DISCUSSION: These results suggest that leptin may play some role in counteracting the abnormal eating behavior, reproductive function, and fat mass in these disorders.

Adipose Tissue↗
PubMed1991

How behavioral stress disrupts the endocrine control of reproduction in domestic animals.

Behavioral stress can prevent animals from achieving normal reproductive success. Stressors associated with intensive livestock management may be responsible for reduced reproductive efficiency. However, before appropriate management decisions can be made to alleviate the effects of behavioral stress on reproduction, it is necessary to identify the mechanisms by which stress disrupts normal reproduction. The neuroendocrine regulation of follicular development and ovulation requires a complex and delicate interplay between the pituitary gonadotropins and the feedback actions of the major follicular steroid, estradiol. Because of this complexity, the regulation of the follicular stage of the estrous cycle and ovulation is especially vulnerable to the effects of stress. Although the pathophysiological mechanisms by which stress disrupts reproduction are not fully understood, the stress-induced secretion of adrenal glucocorticoids seems to be of special significance because these steroids can effect both the synthesis and secretion of gonadotropins. Of additional importance may be the role of corticotropin-releasing hormone and adrenocorticotropin on the regulation of the hypothalamic-pituitary-gonadal axis.

Animals↗
PubMed1994

Implications of hormonal influences on sexual behavior for demographic models of reproduction.

In exploring the implications of hormonal influences on sexual behavior for reproduction, we have focused on androgens because of the convincing evidence for androgenic effects on female sexual motivation. We have been guided by the simple idea, based on clinical findings among hyperandrogenic women, that higher testosterone levels will increase female sexual motivation which in turn will result in increased coital frequency. However, careful consideration of the evidence fails to confirm such a role for testosterone in sexual behavior among normal women at any point in the reproductive span. While some amount of testosterone appears to be important in maintaining female sexual motivation, there is little evidence that variation in testosterone within the normal range is associated with variation in sexual motivation. Reported associations between testosterone and sexual behavior among married women cannot be interpreted as resulting from androgenic effects on sexual motivation. Thus we are left with the task of explaining why testosterone does not appear to play the same role in libido among hyperandrogenic and normal women. As mentioned earlier, some of the difference may attributable to the much higher levels of testosterone among hyperandrogenic women. Sherwin points out that the levels of sexual motivation decline with declining testosterone levels even while testosterone is well above normally occurring levels. It is possible that the brain is simply not sensitive to the variation in testosterone levels found in normal women. Other evidence suggests that the presence of intact ovaries may be equally important. A recent study of androgen replacement in naturally post-menopausal women failed to find a dramatic effect of testosterone on sexual motivation and behavior, despite levels similar to those in studies on surgically menopausal women, pointing to the importance of other factors associated with the presence of ovaries. A similar point can be made with regard to hyperandrogenism related to endogenous sources of testosterone, as in the case of PCOS. High levels of testosterone effectively disrupt ovarian function and interfere with other ovarian processes. Among hyperandrogenic women sexual behavior appears to be related to the direct effects of androgens on motivation, while the indirect effects of estrogen and progesterone are essentially eliminated. Among normal women, on the other hand, there is little evidence for such a dominating role of a direct androgenic effect on sexual behavior. Instead, other ovarian hormones, including estrogen and progesterone may also play a demonstrable role, despite the lack of strong evidence at this point.(ABSTRACT TRUNCATED AT 400 WORDS)

Adolescent↗
PubMed2006

Health behaviors among women of reproductive age with and without a history of gestational diabetes mellitus.

OBJECTIVE: To estimate the prevalence of several health-related behaviors among women of reproductive age with and without a history of gestational diabetes mellitus (hGDM). RESEARCH DESIGN AND METHODS: We performed a cross-sectional study using the 2001-2003 Behavioral Risk Factor Surveillance System, a national population-based random sample telephone survey. Participants were 177,420 women aged 18-44 years with and without self-reported hGDM. Outcome measures included meeting physical activity and fruit and vegetable guidelines, sedentary activity level, and current smoking. RESULTS: Approximately 3% (n = 4,718) of women aged 18-44 years reported physician-diagnosed hGDM. Women with hGDM had higher BMIs, were significantly older, were less often educated or employed, and were more often Hispanic or African American, married, and living with children. Women with hGDM reported worse self-rated health than women without hGDM. In unadjusted and multivariate adjusted comparisons, there were no significant differences in levels of physical activity, fruit and vegetable consumption, or smoking among women with and without hGDM. However, women with hGDM who lived with children were significantly less likely to meet fruit and vegetable consumption guidelines (odds ratio 0.78 [95% CI 0.63-0.97]; P < 0.05) and more likely to smoke (1.21 [1.01-1.47]; P < 0.05) than their counterparts without hGDM. CONCLUSIONS: Despite their elevated risk for future diabetes, women with hGDM who lived with children were less likely to meet fruit and vegetable consumption guidelines and more likely to smoke than women with children who did not have hGDM.

Adolescent↗
PubMed2000

Corticosterone treatment has no effect on reproductive hormones or aggressive behavior in free-living male tree sparrows, Spizella arborea.

We examined the effect of corticosterone on plasma levels of reproductive hormones (testosterone, dihydrotestosterone, and luteinizing hormone) and territorial defense behavior in male tree sparrows, Spizella arborea. Birds receiving Silastic implants filled with corticosterone (B) had significantly higher plasma levels of B than control birds, which received empty implants, and exhibited pectoral muscle wastage and a decrease in body mass. We evaluated the hormonal and agonistic responses of the two implanted groups of birds using a simulated territorial intrusion (STI) 2 to 4 days after they were implanted. Corticosterone-treated and control birds did not differ in their circulating levels of reproductive hormones or in their behavioral responses to STI (latency to respond to intrusion, number of songs, and closest approach to a decoy and tape recording). Unlike previous studies of north temperate passerines, high physiological levels of exogenous B had no effect either on circulating levels of reproductive hormones or on territorial behaviors associated with breeding. Nonetheless, untreated tree sparrows do mount a robust adrenocortical response, having a two- to fourfold increase in plasma B levels during a 1-h period of capture. Thus, adrenocortical responsiveness is maintained in these birds, but elevated levels of glucocorticoids do not suppress reproductive hormones or associated behaviors. We believe that this hormonal and behavioral refractoriness to glucocorticoids-or uncoupling of the stress response from the reproductive axis-may be advantageous for species having extreme temporal constraints on their breeding schedules.

Adrenal Cortex↗
PubMed2006

Reproductive experience alters anxiety-like behavior in the female rat.

Reproductive experience (i.e. pregnancy and lactation) results in significant alterations in subsequent hormone levels in female rats. Several studies have demonstrated that circulating hormones can significantly affect anxiety-like behavior. Thus, the purpose of the present study was to determine whether reproductive experience induces alterations in anxiety-like behaviors in cycling female rats and in older, reproductively senescent rats. In Experiment 1, the elevated plus maze (EPM) was used to test young cycling (6-8 weeks post-weaning) and middle-aged (32-36 weeks post-weaning) primiparous rats and their age-matched nulliparous counterparts for anxiety-like responses. In Experiment 2, activity in the open field was used as an additional measure of anxiety-like behavior in young (proestrus) and middle-aged (constant estrus) primiparous and nulliparous rats. For Experiment 3, EPM testing was conducted in separate groups of young and middle-aged animals tested two weeks after ovariectomy. The results revealed that during proestrus, primiparous animals exhibited fewer anxiety-like behaviors on the EPM compared to nulliparous controls. In middle-aged animals, however, parity was associated with increased anxiety-like behavior. In the open field, young, non-lactating primiparous animals again exhibited fewer anxiety-like behaviors compared to nulliparous controls, an effect that was reversed in middle-aged animals. Effects of reproductive experience on the EPM in both age groups were eliminated by ovariectomy. Overall, the findings indicate that reproductive experience significantly alters anxiety-like behavior, effects that are influenced by the endocrine status and/or age of the female.

Age Factors↗
PubMed2001

Time reproduction, working memory, and behavioral inhibition in children with ADHD.

Barkley (1997a) proposed that the central deficit in Attention Deficit Hyperactivity Disorder (ADHD) is in behavioral inhibition, resulting in deficits both in working memory and sense of time. To test this theory, 21 children with ADHD and a matched sample (ages 6-13) completed a variety of tasks that measured behavioral inhibition, working memory, attention, and time reproduction. Children with ADHD performed significantly below controls on measures of inhibition, attention, and time reproduction. They did not differ significantly from controls, however, on tasks of working memory. In addition, performance on the working memory tasks was not correlated with the time reproduction task. We discuss the relevance of these results in the context of current theories of ADHD.

Attention Deficit Disorder with Hyperactivity↗
PubMed1991

Pregnancy, STDS, and AIDS prevention: evaluation of New Image Teen Theatre.

New Image Teen Theatre combines peer education and theatre in an informative and entertaining package. This study was undertaken to assess the effectiveness of New Image Teen Theatre on altering teenagers' attitudes, knowledge, and intentions regarding sexual behavior. A total of 143 adolescents between the ages of 13 and 19 viewed the performance. The performance focused on the prevention of pregnancy, AIDS, and STDs and included content aimed at increasing communication. Teen participants completed pretest and posttest questionnaires. Almost half of the adolescents reported having engaged in sexual intercourse. About one third of the sexually active reported never using birth control, and only 21% reported consistent use of condoms. These results confirm adolescents' risk for pregnancy, STDs, and AIDS in particular. Following the performance, the teens reported significantly more willingness to discuss sexual issues with others, significantly greater intention to use birth control (for sexually active teens), and demonstrated significantly greater sexual knowledge. Furthermore, they indicated that they had experienced more positive emotions than negative emotions while viewing the production. Results suggest that theatre education may set the stage for more comprehensive interventions designed to prevent pregnancy, STDs, and AIDS.

Acquired Immunodeficiency Syndrome↗