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PubMed2002

Prevalence and correlates of weight-control behaviors among Caribbean adolescent students.

Adolescent students from nine English-speaking Caribbean countries completed a survey that assessed weight-control behaviors. Weight-control behaviors were prevalent and similar across gender. Extreme weight-control behaviors were related to several psychosocial factors and compromising health behaviors. Future interventions should target adolescents who are using weight-controlling behaviors to prevent future eating disturbances and psychosocial and health morbidities.

Adolescent↗
PubMed2007

Space, time and learning in the hippocampus: how fine spatial and temporal scales are expanded into population codes for behavioral control.

The hippocampus participates in multiple functions, including spatial navigation, adaptive timing and declarative (notably, episodic) memory. How does it carry out these particular functions? The present article proposes that hippocampal spatial and temporal processing are carried out by parallel circuits within entorhinal cortex, dentate gyrus and CA3 that are variations of the same circuit design. In particular, interactions between these brain regions transform fine spatial and temporal scales into population codes that are capable of representing the much larger spatial and temporal scales that are needed to control adaptive behaviors. Previous models of adaptively timed learning propose how a spectrum of cells tuned to brief but different delays are combined and modulated by learning to create a population code for controlling goal-oriented behaviors that span hundreds of milliseconds or even seconds. Here it is proposed how projections from entorhinal grid cells can undergo a similar learning process to create hippocampal place cells that can cover a space of many meters that are needed to control navigational behaviors. The suggested homology between spatial and temporal processing may clarify how spatial and temporal information may be integrated into an episodic memory. The model proposes how a path integration process activates a spatial map of grid cells. Path integration has a limited spatial capacity, and must be reset periodically, leading to the observed grid cell periodicity. Integration-to-map transformations have been proposed to exist in other brain systems. These include cortical mechanisms for numerical representation in the parietal cortex. As in the grid-to-place cell spatial expansion, the analog representation of number is extended by additional mechanisms to represent much larger numbers. The model also suggests how visual landmarks may influence grid cell activities via feedback projections from hippocampal place cells to the entorhinal cortex.

Animals↗
PubMed1997

Responses to an in-basket activity: the role of work stress, behavioral control, and informational control.

This study was undertaken to examine the main and interactive effects of work stress and work control on levels of adjustment. Work stress, behavioral control, and informational control were manipulated in an experimental setting in which participants (N = 192) completed an in-basket activity. Although minimal support was found for the main and interactive effects of objective work stress, behavioral control, and informational control on adjustment, analyses involving the subjective measures of these variables revealed strong support for the proposal that work stress, behavioral control, and informational control would exert main effects on adjustment. There was also evidence that subjective levels of behavioral control buffered the negative effects of subjective work stress on positive mood, subjective task performance, and task satisfaction.

Adaptation, Psychological↗
PubMed2006

Alcohol self-control behaviors of adolescents.

PURPOSE: The aims of the present study were to: (1) factor analyze a 13-item adolescent alcohol self-control behavior scale, (2) examine associations between frequency of self-control behavior use and alcohol consumption, and (3) to determine which self-control behaviors best predict alcohol use and consequences. METHODS: A confidential standardized survey was used to collect data on participant's 30-day frequency, quantity, and heavy use of alcohol; alcohol-related consequences; and alcohol self-control behaviors. RESULTS: A principal component factor analysis produced the following three components: Healthy Alternatives (alpha=.81), Self-regulation (alpha=.72), and Assertive Communication (alpha=.73). MANOVAs indicated strong associations between frequency of use of the three types of self-control behaviors and alcohol consumption (p values< or =.001). Logistic regression analysis revealed that Self-regulation behaviors were the best predictor for all alcohol use measures and consequences (p values< or =.001). CONCLUSION: Self-control behaviors differ in their ability to predict alcohol use and consequences. Self-regulation strategies emerged as the most consistent predictor of alcohol use patterns and consequences among adolescents, followed by Healthy Alternatives.

Adolescent↗
PubMed2000

Weight-control behaviors among adults and adolescents: associations with dietary intake.

BACKGROUND: This study aimed to assess the prevalence of weight-control behaviors and their associations with overall dietary intake among adults and adolescents. METHODS: Participants included 3,832 adults and 459 adolescents from four regions of the United States. Cross-sectional data were collected on energy and nutrient intake, weight-control behaviors, body mass index (BMI), and sociodemographics. RESULTS: Current weight-control behaviors were reported by 52.7% of the study population (adult women, 56.7%; adult men, 50.3%; adolescent girls, 44.0%; adolescent boys, 36.8%). Weight-control behaviors were consistently and positively associated with socioeconomic status among adults, but not among adolescents. Among "dieters," unhealthy practices were reported by 22.7% of adult women, 21.3% of adult men, 30.4% of adolescent girls, and 18.5% of adolescent boys. Adults trying to control their weight reported healthier nutrient intakes than those not trying to control their weight, in particular when moderate weight-control methods were employed. Among adolescents, there were fewer differences across dieting status and these were not suggestive of healthier intakes among dieters than nondieters. CONCLUSIONS: Weight-control behaviors are reported by a large percentage of the population. Weight-control behaviors tend to be healthier among adults than among adolescents, in terms of the types of behaviors used and their impact on nutrient intakes. Obesity prevention interventions should emphasize the importance of using healthy weight-control practices.

Adolescent↗
PubMed2006

Religion, weight perception, and weight control behavior.

Religion's relationships with weight perception and weight control behavior were examined using data (3032 adults aged 25-74) from the National Survey of Midlife Development in the United States. Religion was conceptualized as denomination, religious attendance/practice, religious social support, religious commitment, religious application, and religious identity. Weight perception was conceptualized as underestimating body weight, overestimating body weight, and accurately assessing body weight. Respondents also reported whether they had engaged in any intentional weight loss (yes/no) in the last 12 months. Logistic regression was used, with significant results being set at a p-values of <.01 and <.05. Accurately assessing body weight was the reference category for all weight perception analyses. Women with greater religious commitment and men with greater religious application had greater odds of underestimating their body weight. This relationship remained significant, controlling for age, race/ethnicity, education, and income. Jewish women had greater odds of overestimating their body weight. There were no relationships between religion and weight control behavior. Relationships between religion, weight perception, and weight control behavior illustrate religion's multidimensionality.

Adult↗
PubMed1998

Adolescents engaging in unhealthy weight control behaviors: are they at risk for other health-compromising behaviors?

OBJECTIVES: This study sought to determine whether adolescents engaging in weight control behaviors are at increased risk for tobacco, alcohol, and marijuana use; suicide ideation and attempts; and unprotected sexual activity. METHODS: Data were collected on a nationally representative sample of 16,296 adolescents taking part in the 1993 Youth Risk Behavior Survey. RESULTS: Adolescents using extreme weight control behaviors were at increased risk for health-compromising behaviors, while associations with other weight control behaviors were weak and inconsistent. CONCLUSIONS: The findings have relevance to clinical work with youth, provide a better understanding of disordered eating, and open up a number of opportunities for future research.

Adolescent↗
PubMed2003

Weight-control behavior among obese children: association with family-related factors.

UNLABELLED: The purpose of this study was to investigate the weight-control behavior of obese children, to understand parents' supervision and to explore related factors that influenced the weight-control behavior. A structured questionnaire was employed in this study. A random sample of 287 children and their parents was recruited from six elementary schools in Shihlin and Peitou districts of Taipei City. Criteria employed for recruitment of subjects were: third and fourth grade in elementary schools, and weight-for-length index > or = 1.2. RESULTS: Fifty-six percent of the obese children were mildly obese and eleven percent were severely obese. Ninety-seven percent of the subjects adopted weight-control behavior, the most frequent one being avoiding fried food. The exercise frequency and time duration consistency were generally insufficient. Twenty-seven percent of the obese children were not in the habit of exercising. Factors that influenced the execution of weight-control behavior by the obese children included obesity level, mother's education, family structure, socioeconomic status of the family, parents' perception of their children's weight, parents' concern, and supervision. Our study found that severely obese children attempted to lose weight with inappropriate methods. Children staying in foster families or with grandparents, or from families of low socioeconomic status, had poorer weight-control behavior. Children whose parents were more concerned about their weight problem tended to have better weight-control behavior. Therefore, it is important to assist the parents of obese children to confront the issue of obesity and help the children solve their weight problem. It is also important to help foster families with low income to make the most of social resources to reinforce the family function.

Attitude to Health↗
PubMed2007

Is dieting advice from magazines helpful or harmful? Five-year associations with weight-control behaviors and psychological outcomes in adolescents.

OBJECTIVE: The purpose of this study was to evaluate the association between frequent reading of magazine articles about dieting/weight loss and weight-control behaviors and psychological outcomes 5 years later in a sample of adolescents. PARTICIPANTS AND METHODS: Data are from Project EAT (Eating Among Teens), a 5-year longitudinal study of eating, activity, weight, and related variables in 2516 middle and high school students. In 1999 (time 1), participants completed surveys and had their height and weight measured. In 2004 (time 2), participants were resurveyed. RESULTS: For female adolescents, the frequency of healthy, unhealthy, and extreme weight-control behaviors increased with increasing magazine reading after adjusting for time 1 weight-control behaviors, weight importance, BMI, and demographic covariates. The odds of engaging in unhealthy weight-control behaviors (such as fasting, skipping meals, and smoking more cigarettes) were twice as high for the most frequent readers compared with those who did not read magazine articles about dieting and weight loss. The odds of using extreme weight-control behaviors (such as vomiting or using laxatives) were 3 times higher in the highest frequency readers compared with those who did not read such magazines. There were no significant associations for either weight-control behaviors or psychological outcomes for male adolescents. CONCLUSIONS: Frequent reading of magazine articles about dieting/weight loss strongly predicted unhealthy weight-control behaviors in adolescent girls, but not boys, 5 years later. Findings from this study, in conjunction with findings from previous studies, suggest a need for interventions aimed at reducing exposure to, and the importance placed on, media messages regarding dieting and weight loss.

Adolescent↗
PubMed1999

Weight control behaviors among adult men and women: cause for concern?

OBJECTIVES: To examine gender differences in weight control behaviors; their duration and the consistency of their use over a 3-year period; and variations of these behaviors by body mass index (BMI). RESEARCH METHODS AND PROCEDURES: The study population included 714 women and 229 men participating in a community-based weight gain prevention program who completed surveys about their weight control behaviors annually for 3 years. General dieting behaviors (e.g., current, regular, and past dieting), dietary restraint (using Restrained Eating subscale of the Three-Factor Eating Questionnaire), and specific weight control practices (e.g., increasing exercise, skipping meals, and taking laxatives) were assessed. RESULTS: Women were more likely than men to report weight control behaviors, with particularly strong associations found between gender and "history of dieting" (odds ratio = 8.1) and "participation in an organized weight loss program" (odds ratio = 11.7). Among both genders, exercise was the most frequently reported specific weight loss practice (66% of women and 53% of men), followed by decreasing fat intake (62% of women and 48% of men). The use of at least one unhealthy weight control behavior over the past year was reported by 22% of the women and 17% of the men. Gender differences were not found for duration of use of most of the specific weight control practices over the past year, or for consistency of general dieting behaviors and dietary restraint over time. Although both gender and BMI were strongly associated with dieting behaviors, interactions between gender and BMI on prevalence rates of dieting were not significant. DISCUSSION: Although weight control behaviors were more prevalent among women than men, in general, large gender differences were not found in the types of behaviors used and the duration and consistency of their use. The high percentages of adults using healthy methods of weight control was encouraging. However, there is still cause for concern, in that unhealthy weight control practices were also reported by a significant percentage of the population.

Adult↗
PubMed2003

Alcohol-induced impairment of behavioral control: effects on the alteration and suppression of prepotent responses.

OBJECTIVE: Alcohol use in humans is associated with aggression and other socially inappropriate behaviors. These adverse effects have been attributed to an acute impairment of behavioral control, and research findings indicate that inhibitory aspects of behavioral control might be particularly vulnerable to the effects of alcohol. The present study tested the degree to which alcohol-induced impairment of behavioral control is due to a specific impairment of inhibitory mechanisms or due to a general information processing deficit. METHOD: Forty subjects (29 men) performed a cued reaction time task before and after receiving 0.65 g/kg alcohol or a placebo. Subjects performed the task under conditions that differed in the type of response needed to maintain behavioral control: response-suppression and response-alteration. RESULTS: Alcohol impairment was observed when behavioral controlwas dependent on response-suppression, but no impairment was observed when control relied on response-alteration. CONCLUSIONS: The findings point to the susceptibility of inhibitory processes by showing that alcohol can be particularly detrimental to behavioral control in situations where prepotent responses must be completely suppressed. Evidence for alcohol-induced impairment of inhibitory functions could provide important clues about basic behavioral mechanisms by which alcohol disrupts such higher order cognitive processes as working memory, learning and decision making.

Adult↗
PubMed2006

Parent-adolescent communication about sexuality: the role of adolescents' beliefs, subjective norm and perceived behavioral control.

OBJECTIVE: To examine to what extent adolescents' beliefs, subjective norm and perceived behavioral control predict the amount of parent-adolescent communication about sexuality. In addition, the role of adolescents' gender, ethnic background, religiosity and educational level on these relationships was assessed as well. METHODS: Data were collected from 481 students of four high schools in The Netherlands. A questionnaire assessed adolescents' beliefs, subjective norm, perceived behavioral control, and self-reported parent-adolescent communication about sexuality. Linear regression analyses were performed to identify predictors of parent-adolescent communication. To assess differences between subgroups, chi(2)-analyses, t-tests and analyses of variance were conducted. RESULTS: Being female and having positive beliefs about talking with parents about sexuality were positively related to amount of parent-adolescent communication. In addition, adolescents' perceived behavioral control and subjective norm were significant predictors as well. CONCLUSION: Adolescents' beliefs, subjective norm and perceived behavioral control, are all significant predictors of frequency of parent-adolescent sex communication, with beliefs being the most important. In addition, adolescents' gender predicted a significant amount as well. PRACTICE IMPLICATIONS: Interventions aimed to increase the amount of parent-adolescent communication should primarily target their efforts to changing adolescents' underlying beliefs about discussing sexuality with their parents. Our results furthermore suggest that it is important to take into consideration gender variations in these beliefs, by designing separate interventions for different groups of adolescents.

Adolescent↗
PubMed1992

[Dyspnea and behavioral control].

Respiration is automatically regulated via chemo- and mechanoreceptors existing in and outside the lungs, but it is also controlled voluntarily by behavioral factors. Voluntary increase in ventilation accentuates dyspnea and the sensory intensity at a given ventilation does not differ from that of exercise-induced hyperventilation, but it is significantly smaller than that during hypercapnia or hypoxia. Voluntary constraint of ventilation augments dyspnea in proportion to the degree of constraint even under isocapnic hyperoxia, and the respiratory sensation during constrained breathing is qualitatively more discomfortable than that during hyperventilation. Changes in the level and pattern of breathing under constant levels of chemical stimuli increase respiratory sensations and the intensity of dyspnea is minimal near the spontaneous levels, which supports the hypothesis that breathing is behaviorally regulated in part to minimize dyspnea. The system of behavioral control of breathing appears to be involved in the maintenance of body homeostasis by modifying the respiratory output through respiratory sensations.

Carbon Dioxide↗
PubMed2006

Overweight status and weight control behaviors in adolescents: longitudinal and secular trends from 1999 to 2004.

BACKGROUND: This study examined 5-year longitudinal and secular trends in weight status and the use of healthy and unhealthy weight control behaviors in adolescents. METHODS: Project EAT-II followed 2516 adolescents from Minnesota longitudinally from 1999 to 2004. The population included two cohorts allowing for the observation of transitions from early to middle adolescence (junior high school to high school) and from middle to late adolescence (high school to post-high school). RESULTS: The prevalence of overweight (females: 28.7%; males: 28.0%) was high in early adolescence and remained high throughout adolescence. In females, between early and middle adolescence, there were steep longitudinal increases in the use of unhealthy weight control behaviors (48.6% to 58.8%, P = 0.001) and extreme weight control behaviors (9.4% to 17.9%, P < 0.001), and between middle and late adolescence, extreme weight control behaviors increased from 14.5% to 23.9% (P < 0.001). In males, extreme weight control behaviors doubled from middle to late adolescence (3.4% to 6.3%, P = 0.023). Use of diet pills doubled from 7.5% to 14.2% from 1999 to 2004 (P = 0.004) in high school females. One fifth (19.9%) of females in late adolescence reported taking diet pills. CONCLUSIONS: Overweight status and unhealthy weight control behaviors in adolescents are major public health concerns that warrant interventions addressing both problems.

Adolescent↗
PubMedDate not supplied

Fruit and vegetable intake and weight-control behaviors among US youth.

OBJECTIVE: To examine the relationship between fruit and vegetable intake and weight control behaviors among youth. METHODS: Data (N = 16,262) were derived from the 1997 national school-based Youth Risk Behavior Survey (YRBS). RESULTS: Results indicated that adolescents in this study, especially females, were at risk for inadequate fruit and vegetable intake. Weight-control behaviors were high especially among females. CONCLUSION: Although some weight-control behaviors may be hazardous, adolescents who were practicing weight-control behaviors engaged in the positive dietary behavior of consuming more servings of fruits and vegetables.

Adolescent↗
PubMed2006

From automatic antigay prejudice to behavior: the moderating role of conscious beliefs about gender and behavioral control.

Two experiments tested whether the relation between automatic prejudice and discriminatory behavior is moderated by 2 conscious processes: conscious egalitarian beliefs and behavioral control. The authors predicted that, when both conscious processes are deactivated, automatic prejudice would elicit discriminatory behavior. When either of the 2 processes is activated, behavioral bias would be eliminated. The authors assessed participants' automatic attitudes toward gay men, conscious beliefs about gender, behavioral control, and interactions with gay confederates. In Experiment 1, men's beliefs about gender were heterogeneous, whereas women's beliefs were mostly egalitarian; men's responses supported the predictions, but women's responses did not. In Experiment 2, the authors recruited a sample with greater diversity in gender-related beliefs. Results showed that, for both sexes, automatic prejudice produced biased behavior in the absence of conscious egalitarian beliefs and behavioral control. The presence of either conscious process eliminated behavioral bias.

Adult↗