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PubMed2007

Using the theory of planned behavior to understand the determinants of exercise intention in patients diagnosed with primary brain cancer.

The purpose of the present study was to examine the demographic, medical, and social cognitive determinants of exercise intentions in a institution-based cohort of primary brain tumor patients. Using a cross-sectional survey, 100 primary brain tumor patients completed a mailed survey that assessed medical and demographic characteristics, past exercise behavior using the Godin Leisure Time Exercise Questionnaire (GLTEQ), and social cognitive beliefs towards exercise using Aizen's theory of planned behavior (TPB; i.e. intention, perceived behavioral control, subjective norm, affective and instrumental attitude). Descriptive statistics indicated that participants had positive social cognitive beliefs towards exercise. In support of the tenets of the TPB, we found moderate to large (>0.40) positive correlations between the majority of TPB constructs. Moreover, the TPB constructs combined to explain 32% of the variance in exercise intentions with affective attitude (beta = 0.24; p = 0.020) and perceived behavioral control (beta = 0.36; p<0.001) being the most important determinants. Except past exercise behavior, medical and demographic variables were not consistently correlated with any TPB constructs. Finally, participant's gender and body mass index influenced the association between instrumental attitude and exercise intention with male and overweight/obese patients (> or =25 kg/m(2)) considering the health benefits of exercise to be more important than their female and normal weight (<25 kg/m(2)) counterparts. Information gained from this study suggests that the TPB is a useful framework to design and implement theoretically based interventions to promote exercise in primary brain cancer patients.

Adult↗
PubMed2005

Psychological and behavioral risk factors for obesity onset in adolescent girls: a prospective study.

Because little is known about risk factors for obesity, the authors tested whether certain psychological and behavioral variables predicted future onset of obesity. The authors used data from a prospective study of 496 adolescent girls who completed a baseline assessment at age 11-15 years and 4 annual follow-ups. Self-reported dietary restraint, radical weight-control behaviors, depressive symptoms, and perceived parental obesity--but not high-fat food consumption, binge eating, or exercise frequency-predicted obesity onset. Results provide support for certain etiologic theories of obesity, including the affect regulation model. The fact that self-reported, weight-control behaviors identified girls at risk for obesity implies that high-risk youths are not engaging in effective weight-control methods and suggests the need to promote more effective strategies.

Adolescent↗
PubMed2005

Determinants of adolescent bicycle use for transportation and snacking behavior.

BACKGROUND: The prevalence of obesity has reached epidemic proportions in many countries and is largely due to behavioral factors that disrupt the energy balance. The purpose of the study was to test how well our conceptual model, combining features from the Theory of Planned Behavior and the Theory of Triadic Influence, explained two behaviors related to the energy balance, namely bicycle use for transportation and snacking behavior in a Dutch adolescent sample. METHODS: Data was gathered in an 1997 cross-sectional sample of adolescents (n = 3,859; mean age 14.8 years SD = 1.6) on snacking behavior, bicycle use, demographics, and potential environmental, cognitive and psychological determinants. Data was analyzed using bivariate correlations, multiple linear and binary logistic regression analyses. RESULTS: Less snacking behavior was associated with female gender and a more positive intention, a more positive attitude, and stronger perceived behavioral control towards restricting snacking. Students who used their bicycle for transportation were more likely to attend secondary education, to be native Dutch, to go to school in a less-urbanized city, to be younger, had a more positive intention and perceived stronger behavioral control and subjective norm towards bicycle use. CONCLUSIONS: The inclusion of environmental factors increased our understanding of bicycle use for transportation and snacking behavior in adolescents. The environmental factors are suggested to be taken into account in interventions aimed at changing these behaviors in more healthy directions.

Adolescent↗
PubMed2006

Relationships between maternal and adolescent weight-related behaviors and concerns: the role of perception.

OBJECTIVE: The purpose of this study was to explore the relationship between maternal and adolescent weight-related behaviors and concerns in a population-based sample. METHODS: Participants were 810 adolescents (n=429 girls and n=381 boys) and their mothers/guardians. Adolescents were part of the Project EAT (Eating Among Teens) study, which was a comprehensive study of eating patterns and weight concerns among adolescents in Minnesota. Outcome variables included child's body dissatisfaction, weight concerns, dieting, and use of healthy and unhealthy weight control behaviors. RESULTS: Adolescents reported lower rates of maternal dieting than mothers. Maternal self-report of dieting was not significantly associated with children's weight-related concerns. Children's perceptions of their mothers' behaviors were significantly related to their level of weight concerns and use of weight control behaviors. CONCLUSION: Adolescents' perceptions of maternal behavior affect their weight-related concerns and behaviors. This suggests that mothers who choose to diet should model healthy choices in the areas of nutrition and physical activity.

Adolescent↗
PubMed1998

Predicting back pain sufferers' intentions to exercise.

One important factor in reducing back pain is the performance of exercises prescribed by physicians during treatment. The present investigation was conducted to examine the correlates of an individual's intention to adhere to such prescriptions. On the bases of M. Fishbein's (1980) theory of reasoned action and I. Ajzen's (1988) theory of planned behavior, attitudes, subjective norms, and 2 types of perceived behavioral control were measured in a sample of American patients. Attitudes and subjective norms failed to predict intentions to exercise in accordance with the physician's orders, but each of the perceived behavioral control measures did moderately well as an independent predictor and quite well when combined in a multiple regression approach.

Exercise↗
PubMed1997

Vasopressin/serotonin interactions in the anterior hypothalamus control aggressive behavior in golden hamsters.

Studies in several species of rodents show that arginine vasopressin (AVP) acting through a V1A receptor facilitates offensive aggression, i.e., the initiation of attacks and bites, whereas serotonin (5-HT) acting through a 5-HT1B receptor inhibits aggressive responding. One area of the CNS that seems critical for the organization of aggressive behavior is the basolateral hypothalamus, particularly the anterior hypothalamic region. The present studies examine the neuroanatomical and neurochemical interaction between AVP and 5-HT at the level of the anterior hypothalamus (AH) in the control of offensive aggression in Syrian golden hamsters. First, specific V1A and 5-HT1B binding sites in the AH are shown by in vitro receptor autoradiography. The binding for each neurotransmitter colocalizes with a dense field of immunoreactive AVP and 5-HT fibers and putative terminals. Putative 5-HT synapses on AVP neurons in the area of the AH are identified by double-staining immunocytochemistry and laser scanning confocal microscopy. These morphological data predispose a functional interaction between AVP and 5-HT at the level of the AH. When tested for offensive aggression in a resident/intruder paradigm, resident hamsters treated with fluoxetine, a selective 5-HT reuptake inhibitor, have significantly longer latencies to bite and bite fewer times than vehicle-treated controls. Conversely, AVP microinjections into the AH significantly shorten the latency to bite and increase biting attacks. The action of microinjected AVP to increase offensive aggression is blocked by the pretreatment of hamsters with fluoxetine. These data suggest that 5-HT inhibits fighting, in part, by antagonizing the aggression-promoting action of the AVP system.

Aggression↗
PubMed2003

Understanding soft drink consumption among female adolescents using the Theory of Planned Behavior.

This study identified factors that influence regular soda consumption among 707 female students, aged 13-18 years, attending North Los Angeles County public high schools. Participants completed a group-administered Theory of Planned Behavior-based questionnaire. Almost all of the participants, 96.3%, reported that they currently drink soda; 50.1% reported drinking 2 glasses of soda or more per day during the past year. Students reported drinking regular soda more than diet soda and reported drinking phosphoric acid-containing soda more than non-phosphoric acid-containing soda. Attitude, subjective norm and perceived behavioral control had statistically significant positive associations with intention, and were each significant predictors of intention to drink regular soda and together explained 64% of its variance. The strongest predictor was attitude, followed by perceived behavioral control and subjective norm. Our results suggest that efforts to reduce soda consumption among female adolescents should include parents and friends. It is also important that soda should not be excessively available at home or widely accessible to teenagers at schools. Healthy eating messages for adolescents need to be developed and incorporated into existing and future campaigns to reinforce the perception that there are other healthier drinks that quench thirst and that taste good as well.

Adolescent↗
PubMed2003

Nondaily drinkers score higher on the Alcohol Dependence Scale than daily drinkers.

To evaluate the relationship between drinking pattern and alcohol dependence severity, 209 individuals voluntarily seeking treatment for alcohol problems were administered the Alcohol Dependence Scale (ADS), the Short Alcohol Dependence Data (SADD) questionnaire, and a 12-month Timeline Follow-Back (TLFB) drinking assessment as part of their pretreatment assessment. Based on their TLFB data, participants were divided into two groups: daily (DD, n=84) and nondaily (NDD, n=125) drinkers. The two groups were compared on several demographic and drinking variables. It was hypothesized that DD would have higher scores on measures of alcohol dependence than NDD. However, the reverse pattern was found. The NDD had significantly higher ADS scores than the DD. An analysis of ADS subscale scores indicated that the primary difference between the two groups was in the domain of loss of behavior control. It is suggested that NDD may perceive intoxication as more impairing, perhaps because they have acquired less tolerance than DD. These results suggest that treatment focused on restoring a sense of behavior control would be beneficial for NDD.

Adult↗
PubMed1978

Temporal control of behavior: schedule interactions.

In Experiment I the response that terminated the postreinforcement pauses occurring under a fixed-interval 60-second schedule was reinforced, if the pause duration exceeded 30 seconds. The percentage of such pauses, rather than increasing, decreased. There were complex effects on the discriminative control of the pause by the reinforcer terminating the previous fixed interval, depending on whether the fixed interval and the added reinforcer were the same or different. In Experiments II(a) and II(b), each reinforcement initiated an alternative fixed-interval interresponse-time-greater-than-t-sec schedule, the schedule values being systematically varied. When the response following a pause exceeding a given duration was reinforced, fewer such pauses occurred than when they were not reinforced, i.e., on the comparable simple fixed-interval schedule. There was no systematic relationship between mean interrinforcement interval and duration of the postreinforcement pause. The pause duration initiated by reinforcement was directly related to the dependency controlling the shortest pause at that time, regardless of changes in mean interreinforcement interval.

Journal Article↗
PubMed2006

Pathways to alcohol use among Dutch students in regular education and education for adolescents with behavioral problems: the role of parental alcohol use, general parenting practices, and alcohol-specific parenting practices.

The present study explored the role of parents' alcohol use, general parenting practices (support and behavioral control), and alcohol-specific parenting practices (alcohol-specific rule enforcement and alcohol availability at home) on adolescent alcohol use. Structural equation analyses were performed on cross-sectional data from adolescents who received special education because of behavioral problems (n=411) and from adolescents who received regular education (n=428). The main findings show that alcohol-specific parenting practices appear to be highly important in regulating adolescent alcohol use. Parental alcohol use was related to alcohol-specific rule enforcement and alcohol availability at home. Behavioral control was also related to alcohol-specific rule enforcement. Furthermore, the relationships between parental alcohol use, parenting practices, and adolescent alcohol use did not appear to differ substantially for students in special and regular education.

Adolescent↗
PubMed2005

Antecedents of Taiwanese adolescents' purchase intention toward the merchandise of a celebrity: the moderating effect of celebrity adoration.

The purpose of the present study was to investigate the relative importance of adolescents' attitude toward an act (the degree to which the person had a favorable or unfavorable evaluation or appraisal of the act's behavior in question), perceived norm, and perceived behavioral control in predicting Taiwanese adolescents' intention to purchase the merchandise of a celebrity when they had different levels of celebrity adoration. The present results showed that the relative strengths of attitude toward the act and the perception of behavioral control in predicting purchase intention toward the merchandise of a celebrity were stronger for adolescents in the celebrity adoration group than for adolescents in the celebrity nonadoration group. On the other hand, the relative importance of the perceived norm in predicting the attitude toward the act and the purchase intention was stronger for adolescents in the celebrity nonadoration group than for adolescents in the celebrity adoration group.

Adolescent↗
PubMed1996

Diet and exercise profiles of 30- to 60-year-old male smokers: implications for community heart health programs.

The aim of this study was to estimate the prevalence of diet and exercise behaviors in middle-aged male smokers and identify their determinants of behaviors, with the ultimate goal of designing more effective interventions in a community heart health program. Self-administered, postal questionnaires produced a sample of n = 671 male smokers, 30 to 60 years of age residing in Laval, Quebec's second most populous city. Variables for the study were derived from the theory of planned behavior. Correspondence analysis explained 65% of the variance, classifying smokers into five groups based on diet and exercise behavior. Group 1, smokers with diet and exercise behaviors deemed inadequate for heart health, comprised 43% of the total. Groups 2 and 3, smokers with a diet deemed inadequate or needing improvement respectively, and Group 4, smokers with inadequate exercise, comprised 42% of the total. Group 5, smokers with neither of the other high-risk behaviors, comprised 15% of the total. Four significant variables contrasted Groups 1 to 4 with group 5: age, number of cigarettes smoked daily, and perceived behavioral control (PBC) in both diet and exercise. However, coefficients for age and smoking were weak for all groups. Coefficients for PBC in diet were high and negative only for smokers with an inadequate one. For PBC in exercise, they were high and negative only for smokers who exercised inadequately. Intervention groups based on specific deficiencies in diet and exercise behaviors were then identified. Therefore, the results suggest that smoking cessation programs may be made more effective by targeting specific sub-groups and by providing resources and opportunities to counteract the lack of perceived behavioral control in middle-aged male smokers vis-a-vis diet and exercise.

Adult↗
PubMed1992

A longitudinal assessment of the impact of health/fitness status and health behavior on perceived quality of life.

This study extended cross-sectional research associating quality of life with health and fitness factors. Longitudinal analyses were performed on data collected from 519 U.S. Navy personnel to assess changes in quality of life with changes in health/fitness status and health behavior dimensions at 1-yr. and 2-yr. intervals. Multiple regression results showed that such changes were positively associated with changes in health/fitness status and behaviors related to accident control and wellness maintenance, with these predictors accounting for 8% of the variance in change in quality of life at the 1-yr. interval. At the 2-yr. interval, such change was associated with health/fitness status and accident control behaviors, accounting for 11% of the variance. Health behavior change made a unique contribution to change in quality of life after controlling for changes in health/fitness status at both intervals. Findings affirm modest yet consistent associations between changes in fitness and health variables and quality of life and suggest that improvements in health behavior influence quality of life independently of one's health/fitness status.

Adult↗
PubMed2005

The perceived onset of dieting and loss of control eating behaviors in overweight children.

OBJECTIVE: The current study investigated the self-reported temporal relationships of dieting, binge eating, and overweight in childhood. METHOD: One hundred five non-treatment-seeking overweight children ages 6-13 years were interviewed with the children's Eating Disorder Examination (ChEDE) and queried regarding dieting, loss of control (LOC) eating, and overweight history. Questionnaires of depressive symptoms, trait anxiety, and parent-reported problems were completed. RESULTS: Sixty percent of the children reported having attempted at least one diet. These children had higher ChEDE scores (global, p < .001), greater body mass index (BMI) and body fat mass (p < or = .001), and a trend towards an earlier reported age of overweight onset (p = .06) compared with children who had never dieted. The 29.5% of children who reported LOC eating had significantly higher ChEDE scores (global, p < .001), ineffectiveness, negative self-esteem, and externalizing scores (all ps < .05) compared with those who had never experienced LOC eating. Most children reported becoming overweight before either dieting (79.4%) or experiencing LOC eating (63.6%). Among the 25.7% reporting both dieting and LOC eating, two thirds reported LOC eating before dieting. Participants who reported dieting before overweight had higher negative mood scores (p < .01). Children reporting dieting before LOC eating had higher ChEDE Weight Concern (p < .01) and global (p < .05) scores. DISCUSSION: For overweight, non-treatment-seeking children, both dieting and LOC eating are common. Dieting precedes the development of LOC eating only one third of the time, but is associated with greater disordered eating cognitions. The relationship between childhood-onset dieting and LOC eating in overweight children requires further investigation to determine the causal pathways for the subsequent development of eating disorders.

Adolescent↗
PubMed2006

Degradation and controlled release behavior of epsilon-caprolactone copolymers in biodegradable antifouling coatings.

Copolymers of caprolactone with delta-valerolactone and L-lactide were synthesized by ring-opening polymerization in the presence of tetrabutoxytitane in order to decrease the crystallinity of polycaprolactone (PCL) and to enlarge its potential applications. The kinetics of degradation and controlled release of bioactive molecules were investigated in aqueous medium at room temperature for 9 months. The influence of the comonomer structures, their molar ratio, and the presence of fillers on these kinetics were examined. Complementary analytical methods were used (i) to quantify the degradation of the copolymers by titration of products of degradation (lactic acid, hydroxycaproic acid, and hydroxypentanoic acid) and (ii) to reveal the degradation processes by determination of molecular weights and thermal characteristics. After aging, films were observed by scanning electronic microscopy and EDX microanalysis to check their capabilities for the release of bioactive agent. The results showed that the incorporation of a comonomer such as L-lactide or delta-valerolactone led to a faster degradation than that of PCL homopolymer. The release of biocides could be correlated with the degradation of copolymer but depended on the structure of the leached molecule.

Absorption↗
PubMed1988

Reinforcing effects of nicotine in humans and experimental animals responding under intermittent schedules of i.v. drug injection.

The self-administration paradigm is an experimental model of drug dependence in which the reinforcing properties of drugs can be directly assessed. This paradigm avoids the possible confounding influence of nonpharmacologic factors which may contribute to drug taking in the nonlaboratory environment. When animals serve as subjects, social and cultural factors unique to humans may also be eliminated as confounding influences. Most drugs of abuse are self-administered by animals and humans under such conditions. Until 1981, laboratory studies of nicotine self-administration suggested that nicotine, in its own right, was only a marginally effective reinforcer. As will be shown in the present review, a study by Goldberg and his co-workers in 1981 [13] demonstrated clearly that nicotine could serve as a highly efficacious reinforcer in laboratory animals. There are several parameters which can function to substantially strengthen the behavior which leads to nicotine ingestion. These include the following: (1) intermittent availability of nicotine, (2) intermittent presentation of nicotine-paired stimuli, and (3) concurrent schedules of food reinforcement. Initial findings from a human IV nicotine self-administration study were consistent with those from the animal studies. Together these results confirm that nicotine can function to control behavior by serving as a reinforcer for animals and humans. The results also suggest that commonly used tobacco products function as ideal nicotine delivery systems for controlling behavior since they provide discrete nicotine-paired stimuli and lend themselves to intermittent nicotine delivery.

Animals↗
PubMed2005

Family functioning in school-age children with cystic fibrosis: an observational assessment of family interactions in the mealtime environment.

OBJECTIVE: To examine, using direct observation methodology, differences in family functioning at mealtime between families of school-age children with cystic fibrosis (CF) and families of school-age children without a chronic illness. METHOD: Family functioning was rated using the McMaster Mealtime Interaction Coding System (MICS) during a videotaped dinner among 28 families of children with CF and 27 families of non-ill, age-matched peers. Families were rated on overall family functioning and on six dimensions of the MICS: task accomplishment, communication, affect management, interpersonal involvement, behavior control, and role allocation. RESULTS: Ratings for families of a child with CF were significantly lower than they were for comparison families on overall family functioning and on four of the six MICS dimensions: communication, affect management, interpersonal involvement, and behavioral control. Moreover, a significantly greater percentage of families of children with CF were rated in the unhealthy range on overall family functioning and on five of six MICS dimensions. There was no relationship between family functioning and child weight status for children with CF. CONCLUSIONS: The current study suggests that for families of school-age children with CF, the family system is negatively affected during mealtime. Dietary interventions need to address family-centered, as well as child-centered, interventions to help families manage challenges presented during the family meal.

Child↗