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PubMedDate not supplied

Weight-related issues and high-risk sexual behaviors among college students.

Individuals with high body mass index (BMI), negative body image, and unhealthy weight control behaviors may be more likely to engage in high-risk sexual behaviors than others. Researchers have not fully investigated these relationships in a sample of college students. The authors collected data regarding several weight-related issues and high-risk sexual behaviors (response rate = 39%) from 1,168 college students. Over half reported at least 1 high-risk sexual behavior. After the authors controlled for several demographic characteristics, they found that higher BMIs were associated with increased odds of having a casual sexual partner (odds ratio [OR] = 2.70) and being intoxicated at last intercourse (OR = 2.25). Among women, unhealthy weight control behaviors were associated with having a casual partner (OR = 2.12), using no or unreliable contraception (OR = 1.98), and being intoxicated at last intercourse (OR = 2.31). Weight-related issues were not associated with sexual behaviors among college men. The authors describe their findings within two health behavior frameworks, and they discuss implications for research and health education.

Adolescent↗
PubMed2001

Preliminary study of the analysis of oligogalacturonic acids by electrospray ionization mass spectrometry.

During systematic studies of the behavior of oligogalacturonic acids (OGAs) under different conditions using electrospray ionization mass spectrometry (ESI-MS), cation adduction, fragmentation and non-covalent binding were found to be the three major problems that compromised the analysis of OGAs by ESI-MS. By adjusting solution components, capillary temperature and capillary voltage in the ESI source, an optimized condition was found that gave a clean and clear spectrum of trigalacturonic acid. A direct injection ESI-MS technique based on the use of aqueous acetonitrile and acetic acid and triethylamine (TEA) as modifiers has been applied to analyze a mixture including mono-, di- and trigalacturonic acids, which will facilitate further applications of ESI-MS in the analysis of mixtures of OGAs.

Oligosaccharides↗
PubMed2004

Low bone mass in premenopausal chronic dieting obese women.

BACKGROUND: Obese premenopausal women are thought to be at low risk for osteoporosis due to increased body weight and effects of estrogen on weight-bearing bone. OBJECTIVE: To examine the effect of restrained eating on obese women, we examined bone mineral density (BMD) and content (BMC) of the spine and femur in obese women who were restrained eaters, with emphasis on the relationship between BMC and determinants of bone mass, and current eating behaviors, dietary intake, physical activity, and indices of calcium regulation, bone metabolism, stress and inflammation. DESIGN: A total of 78 obese, Caucasian, female, restrained eaters, ages 30-45 y, were enrolled in a weight lose program. Height, weight, bone turnover markers, serum parathyroid hormone (PTH), cortisol, c-reactive protein (CRP), dietary intake, eating behaviors, physical activity, and BMD and BMC were measured. SETTING: This study was conducted at the University of California, in Davis, CA, USA. RESULTS: In all, 31% of women had osteopenia or osteoporosis (OSTEO). In the OSTEO group, 87.5% of women had osteoporosis or osteopenia of the lumbar spine and 12.5% of the women had osteoporosis or osteopenia in femur. A significant positive correlation between BMC and energy expenditure (r=0.256), and a significant negative correlation between BMC and number of times on a weight loss diet (r=-0.250) and cognitive restraint (r=-0.239) were observed. No significant differences were observed between OSTEO women and nonosteoporotic women for current eating behaviors, dietary intake, physical activity habits, bone turnover, calcium regulation, stress, or inflammation. CONCLUSIONS: Obese restrained eaters are at risk for low bone mass. Prior dieting may be responsible. Chronic dieters should be encouraged to decrease their dietary restraint, develop healthy eating habits and increase physical activity.

Adult↗
PubMed1995

Pathophysiology of osteoporosis: unresolved problems and new insights.

Optimal bone mass depends on sufficient sex hormones, building materials, and loading. Sex hormones add to bone mass the amount that is needed for reproduction. Healthy males keep their testosterone until death, but the female sex loses estrogens at menopause, connected with high bone turnover and bone loss. It is not known why and which women lose more bone than others and develop osteoporosis. One factor could be latent hypoandrogenism. Even in men the levels of bioavailable plasma testosterone correlate with bone mineral density. With respect to nutrition, calcium and vitamin D are most important contributors to bone mass. Osteoporotics absorb less calcium from the gut than controls, perhaps because of unfavorable gene alleles for the vitamin D receptor. Furthermore, the general supply with calcium and vitamin D in the normal population could be of greater significance than assumed. The combination of a receptor defect and a latent deficiency could be deleterious. Finally, bones need loading. Mechanoreceptors that transform physical stress into biochemical signals are postulated to exist and to be upregulated by the sex hormones. As a result, bone mass increases more after exercise when it has been exposed to sex hormones. The amount of bone mass due to spontaneous activity is likely to be genetically determined. Current efforts are devoted to the better identification of risk factors and behavior that impair bone mass and density. The discovery of genetic risks and their early diagnosis in humans would greatly facilitate a preventive regimen.

Animals↗
PubMed2005

Mass media interventions for promoting HIV testing.

BACKGROUND: Use of the mass media is one of the important strategies in communicating behavioral change in relation to HIV/AIDS prevention. Mass media are used to promote voluntary HIV counseling and testing and to sustain test-seeking behavior. OBJECTIVES: To assess the effect of mass media interventions and the most effective form of mass media intervention at a general population level or in specific target populations, in relation to changes in HIV testing, compared with a control group or with pre-intervention levels. SEARCH STRATEGY: We searched the Cochrane Central Register of Controlled Trials (The Cochrane Library Issue 2, 2004), MEDLINE (1966 to April 2004), EMBASE (1980 to April 2004), NLM Gateway, CINAHL (1982 to April 2004), AIDSearch (1980 to April 2004), and PsycINFO (1974 to April 2004), Sociological abstracts (1982 to April 2004), and Communication studies (1982 to April 2003). The reference lists of related reviews were searched and experts in the field were contacted to identify ongoing research. Relevant web sites of international agencies (UNAIDS, WHO, UNFPA, World Bank, and Centers for Disease Control and Prevention) were also searched. All these searches were done without language restriction. All databases were searched up to April 2004. SELECTION CRITERIA: Randomized controlled trials, including cluster-randomized trials and controlled clinical trials, that compared either multimedia interventions or one type of media strategy with a control in relation to promotion of HIV testing were included. Interrupted time series analyses that assessed the effect of mass media against no media or an alternative intervention to promote HIV testing were also included. DATA COLLECTION AND ANALYSIS: Two reviewers independently assessed trial quality and extracted data. Study authors were contacted for additional information. Types of mass media interventions, participants, and outcomes were extracted in every possible instance. MAIN RESULTS: Of the 35 references that were identified, two randomized controlled trials, three non-randomized controlled studies, and nine interrupted time series were included in the final analysis. All individual studies concluded that mass media were effective, and this was confirmed by reanalysis of the interrupted time series studies which all had initial impact. Mass media interventions for promotion of HIV testing showed significant immediate (Random effect: Estimated mean = 5.487, 95%CI = 2.370 to 8.605) and overall (Random effect: Estimated mean = 6.095, 95%CI = 1.812 to 10.378) effect. No long-term effects were seen on mass media interventions for promotion of HIV testing (Random effect: Estimated mean = 4.447, 95%CI = -0.188 to 9.082). AUTHORS' CONCLUSIONS: Mass media interventions have immediate and overall effects in promotion of HIV testing. No long-term effects were seen. There was no significant impact of detecting seropositive status after mass media intervention for promoting HIV testing, and this finding was limited to a small number of studies. Further research is required to identify possible effects on seropositivity status after mass media intervention for promotion of HIV testing among high-risk groups in epidemic countries. Additional research is needed to identify the effectiveness of different types of mass media interventions, the cost effectiveness of the interventions, and characteristics of messages.

Controlled Clinical Trials as Topic↗
PubMed2000

Pathways to serious dieting: significant insights from discontinuity.

OBJECTIVES: This paper outlines a strategy for systematically examining the discontinuity in pathways to serious dieting. METHOD: Eight hundred and twenty-three adolescent females were recruited from six high schools in metropolitan Sydney, Australia. They completed a battery of measures that assessed perceived social influences to diet, predisposition to conformity, protective skills, aspects of positive familial context, and dieting-related attitudes and status. Testing took place over two occasions approximately 10 months apart. RESULTS: Family context, protective skills, and a predisposition to conformity were found to differentiate the vulnerable girls who reported high levels of social influence from those who did not. However, those variables did not differentiate those with high social influence who seriously diet from nondieters. Body mass index, drive for thinness, and body dissatisfaction differentiated all of the comparison groups tested. Age did not consistently differentiate these groups. DISCUSSION: The findings can tell us what seems to protect girls who appear susceptible to social influences from becoming serious dieters.

Adaptation, Psychological↗
PubMed2006

Watching television is associated with childhood obesity: but is it clinically important?

OBJECTIVE: To assess the impact of television viewing during childhood and adolescence on body mass index (BMI) in children up to the age of 15 years. DESIGN: Unselected birth cohort, assessed at birth and every 2 years from age 3 to 15 years. SUBJECTS: In all, 1037 individuals were assessed at age 3 years. At age 15 years, 976 (95% of living cohort) continued to participate. MEASUREMENTS: Parental estimates of weekday television viewing between age 5 and 11 years. Self-reports of television viewing at age 13 and 15 years. Weight and height were measured at each age to calculate BMI. RESULTS: BMI and prevalence of overweight at all ages were significantly associated with mean hours of television viewing reported in the assessments up to that age. These associations were stronger in girls than boys. The associations remained significant after adjusting for parental body mass indices and socio-economic status. CONCLUSION: Time spent watching television is a significant predictor of BMI and overweight in childhood. Although the effect size appears small, it is larger than the effect sizes commonly reported for nutritional intake and physical activity. Television viewing should be regarded as an important contributing factor to childhood obesity.

Adolescent↗
PubMed1994

Using mass media to reduce adolescent involvement in drug trafficking.

OBJECTIVE: Drug trafficking among adolescents is a newly recognized high-risk behavior that seems to be involving large numbers of youths. Strategies to prevent and/or alter this behavior must be developed and evaluated. In view of the high exposure of adolescents to the mass media, interventionists seeking to reduce adolescent risk behavior have increasingly employed the media in their efforts to reduce adolescent risk behaviors in general. However, not all risk behaviors may be amendable to change as a result of this approach. Therefore, before utilizing this approach to address adolescent drug trafficking, it is important to investigate previous efforts targeting related risk behaviors. RESULTS: Mass media campaigns against the use of drugs have been common in the US and seem to have played a role in reducing consumption of both legal and illegal drugs. The most effective messages seem to focus on the risks of drug use and the social disapproval that attends use. The mass media may increase the influence of these antidrug messages by changing the social climate surrounding drug use. CONCLUSIONS: The mass media may be a particularly effective way to reach adolescents and their parents in communities in which adolescent drug trafficking is prevalent and to unite the institutions that could influence adolescents against involvement in the drug trade. However, intervention efforts must also contend with the economic incentives of the drug trade in poor, central-city communities.

Adolescent↗
PubMed1998

The role of family status and ethnic group on body image and eating behavior.

OBJECTIVE: To examine the role of ethnic group and family status on body dissatisfaction and eating behavior. METHOD: One hundred women (Asian mothers and daughters, n = 50; white mothers and daughters, n = 50) completed a questionnaire about their perceived ethnic identity (acculturation), body image, and eating behavior. RESULTS: The results showed no matching between mothers and daughters and no effect of acculturation on body image and eating behavior. However, mothers reported greater body dissatisfaction and white subjects reported higher levels of restrained eating. In addition, the results showed a significant Ethnic Group x Family Status interaction for both body image and eating behavior irrespective of body mass index (BMI). Accordingly, white daughters were found to be the most dissatisfied with their bodies and most concerned with the calorie content of their food, followed by the Asian mothers. White mothers were found to be the most satisfied with their body and Asian daughters were the least concerned with calories. DISCUSSION: The results are discussed in terms of the changing nature of media images in both Asian and white cultures and the impact of the transition between these two cultures.

Acculturation↗
PubMedDate not supplied

Physical activity and levels of inactivity in adolescent females ages 11-16 years in the United Arab Emirates.

The purpose of this study was to investigate patterns of physical activity and levels of inactivity in adolescent females in the United Arab Emirates (UAE). A total of 58 adolescent females, age 11-16 years, were recruited from two female-only governmental schools in Abu-Dhabi. Subjects were divided into two groups: 11-13 years (n = 22) and 14-16 years (n = 36). Physical activity patterns were determined from a 3-day activity diary. Total energy expenditure (TEE) was estimated using a factorial approach. The amount of physical activity was expressed as the physical activity level (PAL) and the activity-related energy expenditure (AEE). The number of hours spent watching television was estimated from the activity diaries. There were no significant differences in the energy expenditure parameters between age groups or between schooldays and weekends. PAL was low in both age groups. Television was the predominant leisure time pursuit. The number of hours per day spent watching television (median and interquartile range) was 2.5 (2.3-3.1) in 11-13 years and 2.5 (2.3-2.8) in 14-16 years. Television-watching was significantly higher during the weekend than schooldays: 11-13 years (P = 0.006) and 14-16 years (P < 0.001). In conclusion, the amount of physical activity undertaken by adolescent females in the UAE was very low. Cultural and weather restrictions and social change of the community in the UAE are not conducive to physical activity and play a major role in levels of physical inactivity. This may explain, in part, the rise in the incidence of obesity in this population.

Adolescent↗
PubMed2000

Duality monomer-dimer of the pheromone-binding protein from Bombyx mori.

The analysis of a recombinant pheromone-binding protein from the silkworm moth, Bombyx mori, by native gel electrophoresis with Coomassie staining showed one single band with a molecular mass consistent with a monomer. A slow migrating band, detected in the recombinant and native samples by a polyclonal antibody, was indistinguishable from the monomer in the mass spectrum fragmentation pattern and chromatographic behavior. Flow injection analyses of the protein by mass spectrometry in the negative mode showed fragments of a dimer. The dimeric form was also supported by estimation of the molecular mass by gel filtration at basic pH. A cross-linked dimer coeluted with the noncovalent dimer on a gel filtration column. The molecular mass of the protein changed in a pH-dependent way with a dramatic transition from dimer to monomer between pH 6 and 4.5. A low pH induced not only dissociation of the dimer, but also a conformational change in the protein. In marked contrast to denaturation with guanidinium chloride, the emission maxima of tryptophan was not significantly changed at low pH. BmPBP is thus a dimer at slightly acid, neutral, and basic pH, which dissociates and then undergoes conformational change at low pH.

Animals↗
PubMed2000

Sex steroids relative to alternative mating behaviors in the simultaneous hermaphrodite Serranus subligarius (Perciformes: Serranidae).

This study is the first investigation of reproductive endocrinology in a simultaneously hermaphroditic teleost, the belted sandfish (Serranus subligarius). We address two questions: (1) Do steroid hormone levels vary during the spawning season or during the daily spawning cycle of sandfish? (2) Do hormone levels vary relative to an individual's phenotype-size, frequency of spawning and aggressive behaviors, and proportion of testis in the gonad? We analyzed circulating estradiol-17beta (E2), testosterone (T), 11-ketotestosterone (11KT), 17alpha,20beta,21-trihydroxy-4-pregnen-3-one (20betaS), and 17alpha,20beta-dihydroxy-4-pregnen-3-one (DHP) concentrations in a field population. Only E2 levels were significantly higher at the new and full moon, suggesting peak periods of vitellogenesis at these times. Naturally spawning sandfish were sampled every 2 h during the photophase of a 25-h period (12 pm to 1 pm the following day) and gonadosomatic index, degree of oocyte hydration and ovulation, and plasma levels of E2, T, DHP, and 20betaS were analyzed. E2 and T levels did not vary during photophase, suggesting continuous recruitment of oocytes into vitellogenesis. The 20betaS levels peaked around the time of final oocyte maturation. Since frequency of spawning behaviors changes with body size, we captured individuals of various sizes throughout the spawning season and analyzed circulating levels of hormones. 11KT and 20betaS levels increased significantly with body size. In 1992, we quantified frequency of spawning and aggressive behaviors, circulating T and 11KT levels and testicular mass relative to ovotestis mass in focal animals. 11KT levels tended to be positively correlated with frequency of courting male behavior, but were unrelated to the frequency of aggressive behavior or testis mass. Because hormone levels increased with size and frequency of each spawning behavior changes with size, we propose that sex steroids influence growth-related changes in spawning tactics of individuals.

Aggression↗
PubMed1990

Ethnocentricity and the social construction of 'mass hysteria'.

This study provides a critical historical review and analysis of the variety of human expressions which have been erroneously labeled under the grandiose category "mass hysteria". It is argued that Western science reductionist approaches to the classification of "mass hysteria" treat it as an entity to be discovered transculturally, and in their self-fulfilling search for universals systematically exclude what does not fit within the autonomous parameters of its Western-biased culture model, exemplifying what Kleinman (1977) terms a "category fallacy." As a result of objectivist methodologies, the etiology of actions labeled as "mass hysteria" is typically viewed as deviant, irrational or abnormal behavior resulting from a malfunctioning 'proper' social order. However, what constitutes 'the' correct social order is a function of a researcher's historical sociocultural and/or scientific milieu. This study reviews the problem, advocating Geertz's (1973) culturally relativistic approach to understanding various cross-cultural behavior that is sensitive to and tolerant of the unique context and milieu of participants. "Mass" or "epidemic hysteria" is viewed as an invention of Western psychiatry and should be abandoned and replaced with the term collective exaggerated emotions. Instead of attempting to 'discover' a neatly packaged, unitary external disease entity, the focus of a meaning-oriented approach emphasizes the deciphering of foreign realities, semantic networks and symbol systems.

Anthropology, Cultural↗
PubMed2006

Readiness for HIV testing among young people in northern Nigeria: the roles of social norm and perceived stigma.

This study examined the predictors of readiness for HIV testing among young people in northern Nigeria, paying special attention to the role of stigma. Stigma is measured at two levels: individual and community (social norm). There are commonalities and differences in the correlates of readiness among men and women. For men and women, knowledge about HIV prevention, knowledge about a source for VCT, discussion about condom use for HIV prevention and perceived risk are strong predictors. Knowledge that an apparently healthy person can be HIV-infected is only significant for women. Perceived stigma is a significant predictor for both men and women although the specific dimension of note differs between the sexes. Social norm is strongly and directly associated with readiness among men but has no apparent influence among women. For both sexes, social norm appears to have strong mediating influence on the relationship between personal perceived stigma and readiness. The results strongly suggest that to eliminate HIV-related stigma, it is not enough to target individual cognitive processes; strategic efforts should target social structures in order to change negative social norms.

Acquired Immunodeficiency Syndrome↗
PubMed2005

The relationship between parent and child self-reported adherence and weight loss.

OBJECTIVE: Better adherence to treatment strategies in family-based behavioral weight control programs may lead to greater weight reduction and improved weight maintenance in youth. This study assessed the influence of child and parent self-reported adherence to behavioral strategies on changes in 2-year child and parent percentage overweight. RESEARCH METHODS AND PROCEDURES: Participants included 8- to 12-year-old children in >or= 85th BMI percentile and their parents from 110 families taking part in two family-based randomized controlled weight control studies. This study examined whether self-reported adherence to behavioral strategies measured at 24 months increased prediction of child and parent percentage overweight change through 24-month follow-up after accounting for other factors that may influence weight change. RESULTS: Child adherence to weighing and to preplanning for celebrations where high-fat foods are served and parent adherence to praising the child and modeling healthy eating habits predicted 24-month child percentage overweight change (p<0.001). Child adherence to recording food and calories and parent adherence to modeling healthy eating habits predicted 24-month parent percentage overweight change (p<0.001). In hierarchical regression models, child weighing and preplanning and parent modeling were significant (p<0.01) incremental predictors (r2 of 24.8%) of 24-month child percentage overweight. Child recording and parent modeling were significant (p<0.01) incremental predictors (r2 of 14%) of parent 24-month percentage overweight change. DISCUSSION: Child and parent adherence to specific components of family-based behavioral weight control treatment are independent predictors of long-term child and parent percentage overweight change.

Adult↗
PubMed2001

Predictors of post-treatment weight reduction after in-patient behavioral therapy.

OBJECTIVE: The goal of the present study was to identify covariates and predictors of post-treatment weight reduction. To clarify the impact of the individual factors, we compared "winners" (losing more than 2 BMI-points in the follow-up period) with "losers" (gaining more than 2 BMI-points in the same time). DESIGN: In a questionnaire based study, we evaluated the psychological impact on eating behavior, general psychopathology and depressive symptoms at three points in time: three months prior to admission (T0), at the beginning (T1) and at the end of in-patient treatment (T2) as well as 6, 12, and 18 months after treatment (T3-T5). SUBJECTS: One hundred and thirty eight obese patients (BMI<30 kg/m(2)) were recruited to the study. All patients participated in a multimodal in-patient treatment program over a period of 10 weeks. Treatment elements were cognitive behavioral therapy, movement therapy, and nutritional counseling. The aim of treatment was to regulate food intake, to minimize dysfunctional emotional influences on eating behavior, to enhance physical exercise and to treat comorbid psychiatric disorders. Twenty nine patients (13%) of the initial sample dropped out or were excluded during the treatment and post-treatment period. RESULTS: During in-patient treatment eating behavior improved and body weight decreased considerably in all patients. The weight reduction continued slightly in the follow-up period. Moreover, general psychopathology, depressive symptoms and eating behavior improved and remained stable during follow-up. These benefits were closely related to weight reduction. Neither eating behavior, nor eating related cognition nor psychopathology measured at T0 and T1 predicted long term success at T5. "Winners" as compared to "losers" at follow-up showed less psychopathology, less depressive symptoms and a less disturbed eating behavior. Already at discharge (T2), winners were less prone to eating triggered by external stimuli and reported fewer feelings of hunger. These differences predicted post-treatment weight reduction (T3-T5). CONCLUSION: Reported feelings of hunger and the tendency to disinhibited eating behavior measured at discharge were able to predict post-treatment weight reduction in our sample. Patients suffering from a feeling of hunger during in-patient treatment were less likely to show further weight reduction in the follow-up period. Similarly, reduction of "disinhibition" during treatment is a precondition for post-treatment weight loss.

Adult↗
PubMed2001

Impact of media on children and adolescents: a 10-year review of the research.

OBJECTIVE: To review the research literature published within the past 10 years regarding the impact of media on children and adolescents. METHOD: Media categories researched with computer technology included television and movies, rock music and music videos, advertising, video games, and computers and the Internet. RESULTS: Research prior to 1990 documented that children learn behaviors and have their value systems shaped by media. Media research since has focused on content and viewing patterns. CONCLUSIONS: The primary effects of media exposure are increased violent and aggressive behavior, increased high-risk behaviors, including alcohol and tobacco use, and accelerated onset of sexual activity. The newer forms of media have not been adequately studied, but concern is warranted through the logical extension of earlier research on other media forms and the amount of time the average child spends with increasingly sophisticated media.

Adolescent↗