Predictors of adherence to a brief sleep extension protocol in emerging adults.

OBJECTIVES: This study examined how mental health symptoms (i.e., depression, anxiety, stress) and baseline sleep characteristics (i.e., sleep quality and levels of daytime sleepiness) predicted adherence to and initial success of a brief sleep extension research protocol in emerging adults. METHODS: 184 emerging adults (ages 18-25; M = 20.96, SD = 2.04) were asked to extend their nightly sleep opportunity to 8 hr for 1 week and to anchor bedtime and waketime. Sleep outcomes (adherence and initial protocol success) were tracked using actigraphy. Baseline sleep quality, daytime sleepiness, depression, anxiety, and stress were assessed using self-report questionnaires. RESULTS: Poorer baseline sleep quality predicted better adherence to the protocol (p = .002). Other baseline sleep characteristics and mental health were not predictive of adherence (ps>.50). Lower levels of baseline daytime sleepiness approached significance in predicting greater initial protocol success following the protocol (p = .05). Baseline sleep quality and mental health did not predict initial protocol success (ps > 0.34). CONCLUSIONS: Mental health symptoms did not significantly predict adherence to or the success of a sleep extension protocol. Surprisingly, individuals with poor baseline sleep quality were more likely to adhere to the extension protocol, perhaps suggesting heightened motivation for change or increased risk for sleep problems. This research provides valuable insight into factors that predict adherence to sleep extension protocols in emerging adults.

Abnormalities in deep-brain morphology and orbitofrontal cortical thinning relate to reward processing and body mass in adolescent girls.

BACKGROUND: Research examining the neural correlates of obesity has recently expanded. However, limited attention has focused on identifying unique brain signatures associated with obesity, particularly in adolescents. The aim of this study was to use surface-based approaches to examine the integrity of brain structures involved in processing the pleasurable effects of food with body mass and food reward sensitivity in adolescent girls. METHODS: Structural morphology of the nucleus accumbens, amygdala, pallidum, and orbitofrontal cortex was examined in 89 adolescent girls with body mass ranging from normal to obese. High-resolution T1-weighted MPRAGE images were used to characterize deep-brain nuclei with high-dimensional diffeomorphic mapping procedures, while cortical thickness was derived from the FreeSurfer toolkit. RESULTS: Results revealed that zBMI was significantly associated with the shape of the left amygdala (ß = -1.1, p < 0.021, 95% CI = -2.02, -0.16), volume of the right and left pallidum (ß = 49.66, p < 0.010, 95% CI = 11.74, 87.58; ß = 47.87, p < 0.017, 95% CI = 8.48, 87.25), and cortical thickness of the lateral and right medial orbitofrontal cortex (ß = -0.06, p < 0.001, 95% CI = -0.09, -0.04; ß = -0.05, p = 0.004, 95% CI = -0.08, -0.02). Sensitivity to food reward significantly predicted volume of the right nucleus accumbens (ß = 0.66, p = 0.047, 95% CI = 0.01, 1). Contrast mapping for surface shape of the amygdala revealed significant outward deformation of the posterior lateral left amygdala and an inward deformation of the basolateral left amygdala in the group with overweight/obesity. CONCLUSIONS: Integrity of the left amygdala and orbitofrontal cortex varies as a function of body mass, with greater localized amygdalar volume loss, pallidum volume, and increased cortical thinning of the orbitofrontal cortex occurring as weight increases. Thus, overweight/obesity may be associated with surface-based abnormalities in brain structures associated with processing of reward value related to food. Overall, findings highlight the importance of understanding changes in reward-related brain regions and how they pertain to variability in body mass in adolescent girls.

Associations Between Parent-Child Communication and Connectedness, Parent Feeding Behavior, and Child Body Mass in Pre-Adolescent Children.

OBJECTIVE: This study evaluated associations between parent-child connectedness and communication, parent feeding behaviors (restriction, pressure to eat, and monitoring), and age- and sex-standardized child body mass index (zBMI) in a sample of pre-adolescent children aged 8-12 years. METHODS: A community sample of three hundred and eight child-parent dyads completed measures of communication and connectedness. Parents completed a feeding behavior measure and children were weighed and their height was measured. We examined whether parental feeding behaviors and parent-child communication and connectedness predicted child zBMI and whether parental feeding behaviors moderated the association between parent-child communication and connectedness and child zBMI. RESULTS: Feeding restriction was positively associated with zBMI, while both pressure to eat and food monitoring exhibited negative associations with zBMI. Child-reported communication was inversely associated with zBMI and parental pressure to eat moderated this association such that lower pressure to eat predicted a stronger association between communication and zBMI. CONCLUSIONS: These findings are consistent with previous research suggesting that parent feeding strategies and parent-child communication are important contributors to child weight status. This study also provides preliminary evidence suggesting that adaptive parent-child communication is associated with lower body mass when parents avoid pressuring their child to eat. Our study provides an important extension of this body of research into middle childhood, a relatively understudied developmental stage.

Effects of Sleep Restriction on Food-Related Inhibitory Control and Reward in Adolescents.

OBJECTIVE: This experimental study evaluated associations between sleep duration, food-related inhibitory control, and food reward in adolescents aged 12-18 with normal weight and overweight/obesity. The potential moderating effect of weight status on the associations between sleep, inhibitory control, and food reward was also examined. METHODS: Thirty-two adolescents with normal weight and 32 adolescents with overweight/obesity (ages 12-18) participated in this study. Participants spent 5 hr in bed per night (restricted sleep) or 9 hr in bed per night (habitual sleep) for five nights with experimental periods separated by 3 weeks. Participants completed a food-related inhibitory control task and a questionnaire assessing food reward on the sixth day of each study phase. RESULTS: Repeated measures analyses of variance revealed that adolescents performed more poorly on a food-related inhibitory control task and had heightened food reward following sleep restriction. Adolescents with overweight/obesity demonstrated heightened food reward compared with adolescents with normal weight; there was no main effect of weight on food-related inhibitory control. There was a significant interaction between sleep condition and weight status on food reward, with adolescents with normal weight demonstrating heightened food reward following sleep restriction. Adolescents with overweight/obesity showed consistently high food reward with no effect of sleep duration. CONCLUSIONS: When sleep restricted, adolescents demonstrated heightened food reward and were less able to inhibit prepotent responses to food images. Adolescents with normal weight who experience acute sleep restriction may perceive foods to be more rewarding relative to normal sleep.

Executive Control Mediates the Association Between Aerobic Fitness and Emotion Regulation in Preadolescent Children.

Objective: This study evaluated direct and indirect associations between aerobic fitness, executive control, and emotion regulation among a community sample of preadolescent children. Methods: Two-hundred and seventy-eight children aged 8-12 years completed measures of aerobic fitness (Progressive Aerobic Cardiovascular Endurance Run) and executive control (Stroop Test). Parents completed questionnaires assessing child emotion regulation and executive control (Emotion Regulation Checklist; Early Adolescent Temperament Questionnaire). We evaluated associations between these constructs using structural equation modeling. Results: Study findings supported a moderate direct association between childhood aerobic fitness and executive control, a strong direct negative association between executive control and emotion regulation, and a moderate indirect association between aerobic fitness and emotion regulation through executive control. Conclusions: These findings provide preliminary evidence that executive control functions as a mediator between aerobic fitness and emotion regulation and may help explain the mechanism by which aerobic exercise influences emotional well-being among preadolescent children.

Motivational Impact of Palatable Food Correlates With Functional Brain Responses to Food Images in Adolescents.

Objective: To examine associations between motivational impact of palatable foods and neural activity in brain regions involved in inhibitory control among adolescents. Methods: Thirty-four adolescents aged 14-20 years underwent functional magnetic resonance imaging while viewing images of high- and low-energy foods. Participants completed the Power of Food Scale (PFS). Whole-brain analyses of variance tested for neural activation differences and correlations between brain activation and PFS scores were tested. Results: We found an interaction between food type (high energy vs. low energy) and PFS scores in the right dorsolateral prefrontal cortex and right inferior parietal lobule. We also found that PFS scores correlated negatively with activation to high-energy foods in prefrontal cortical and parietal regions. Conclusions: These findings suggest that individuals with high motivation for high-energy foods also demonstrate lower neural activation in inhibition-related brain regions when viewing images of high-energy foods, indicating that they may have difficulty inhibiting consumption impulses.

Topical Review: Unique Contributions of Magnetic Resonance Imaging to Pediatric Psychology Research.

OBJECTIVE: This review aims to provide a brief introduction of the utility of magnetic resonance imaging (MRI) methods in pediatric psychology research, describe several exemplar studies that highlight the unique benefits of MRI techniques for pediatric psychology research, and detail methods for addressing several challenges inherent to pediatric MRI research. METHODS: Literature review. RESULTS: Numerous useful applications of MRI research in pediatric psychology have been illustrated in published research. MRI methods yield information that cannot be obtained using neuropsychological or behavioral measures. CONCLUSIONS: Using MRI in pediatric psychology research may facilitate examination of neural structures and processes that underlie health behaviors. Challenges inherent to conducting MRI research with pediatric research participants (e.g., head movement) may be addressed using evidence-based strategies. We encourage pediatric psychology researchers to consider adopting MRI techniques to answer research questions relevant to pediatric health and illness.

Associations between teasing, quality of life, and physical activity among preadolescent children.

OBJECTIVE: This study assessed longitudinal associations between preadolescent's physical activity engagement (PA), health-related quality of life (HRQOL), and teasing during physical activity (TDPA). METHODS: 108 children completed measures of PA, HRQOL, and TDPA during fourth or fifth grade and 1 year later. Potential longitudinal associations between study variables were tested using structural equation modeling. RESULTS: Weight status emerged as an important moderator of the structural relationships. TDPA predicted later HRQOL for children with overweight and obesity, whereas HRQOL predicted later PA in children with normal weight. Both groups demonstrated a significant association between TDPA and HRQOL cross-sectionally. CONCLUSIONS: Children with overweight or obesity who experience TDPA are more likely to report poorer subsequent HRQOL. Children with normal weight who experience TDPA are at increased risk for reduced PA 1 year later. Efforts to reduce TDPA may benefit children's HRQOL and increase PA participation.

Medium is the message: moderate parental control of feeding correlates with improved weight outcome in a pediatric obesity intervention.

OBJECTIVE: Previous studies have suggested complex associations among variables related to parental control of feeding and child/adolescent obesity. The current study examined associations between parental food control variables and weight outcomes in the context of a behaviorally based family treatment program. METHODS: Parents of youths (n = 93) enrolled in a clinical trial comparing 2 weight management interventions completed the Child Feeding Questionnaire pre- and post-treatment, and at a 12-month follow-up. RESULTS: Latent growth curve modeling indicated that mean levels of restriction decreased over the course of treatment in the Positively Fit (PF) condition. Youths in the PF treatment condition whose parents increased their restriction of food experienced greater decreases in zBMI over treatment. CONCLUSIONS: Results echo previous reports that high and low parental control over food intake are associated with higher zBMI. Moderate parental control can be associated with beneficial outcomes in youths enrolled in behavioral treatment programs for obesity.

Evaluation of child health matters: a web-based tutorial to enhance school nurses' communications with families about weight-related health.

The goal of the current study was to assess the efficacy and acceptability of a web-based tutorial (Child Health Matters, CHM) designed to improve school nurses' communications with families about pediatric weight-related health issues. Using a randomized wait-list control design, a nationally representative sample of school nurses was assigned to immediate or delayed access conditions. Pre-, post-, and follow-up assessments of knowledge, barriers to providing obesity treatment, and intended practices were conducted. Results indicated that, relative to wait-list controls, immediate-access nurses demonstrated significant increases in knowledge and decreases in perceived barriers to discussing weight-related health, and significantly greater intentions to assess physical activity, and to recommend dietary changes and physical activity. Wait-list nurses demonstrated significant within-group improvements after completing CHM. Nurses reported a high degree of satisfaction with CHM. Results suggest that web-based tutorials can effect changes in nurses' knowledge, perceived barriers, and intended practices with regard to weight-related health care.

Longitudinal associations between teasing and health-related quality of life among treatment-seeking overweight and obese youth.

OBJECTIVES: To examine concurrent and prospective associations between perceptions of teasing and health-related quality of life (HRQOL) over the course of a behavioral/educational intervention and the subsequent year in a sample of overweight and obese children and adolescents. METHOD: A clinical sample of 93 overweight or obese youths (ages 7-17 years) and 1 parent/guardian completed measures of teasing and HRQOL at pre- and posttreatment and follow-up assessments. Structural equation modeling was used to examine the factor structure of the measures and to assess prospective associations over a 15-month period. RESULTS: Results indicate that, concurrently, weight-related teasing is inversely associated with HRQOL and that, prospectively, HRQOL is inversely associated with subsequent teasing. CONCLUSIONS: Study findings are suggestive of a directional relationship with lower quality of life predicting subsequent higher levels of teasing. Results suggest the potential for interventions designed to improve HRQOL to reduce teasing experiences for overweight and obese youth.

Comparison of a family-based group intervention for youths with obesity to a brief individual family intervention: a practical clinical trial of positively fit.

OBJECTIVE: To examine the effectiveness of a family-based behavioral group intervention (Positively Fit; PF) for pediatric obesity relative to a brief family intervention (BFI) in a sample of treatment-seeking children and adolescents. METHODS: Families (n = 93) were randomized to treatment condition. Assessments were conducted at pre- and posttreatment and at 12-month follow-up. Outcome indices included standardized body mass index (BMI) and quality of life (QOL). RESULTS: Results indicated a significant reduction in zBMI at posttreatment and follow-up across both conditions. At follow-up, BFI and PF participants evidenced average reductions of .12 and .19 zBMI units, respectively. Children demonstrated better outcomes than adolescents across both conditions. Results indicated clinically significant improvements in parent-reported QOL at postintervention and in self-reported QOL at follow-up for PF participants. CONCLUSIONS: Results suggest the effectiveness of family-based interventions for pediatric obesity in clinical settings among younger children. Neither intervention was effective in terms of reducing zBMI among adolescents.

Neural mechanisms that promote food consumption following sleep loss and social stress: an fMRI study in adolescent girls with overweight/obesity.

STUDY OBJECTIVES: Insufficient sleep and social stress are associated with weight gain and obesity development in adolescent girls. Functional magnetic resonance imaging (fMRI) research suggests that altered engagement of emotion-related neural networks may explain overeating when under stress. The purpose of this study is to explore the effects of acute sleep restriction on female adolescents' neural responding during social evaluative stress and their subsequent eating behavior. METHODS: Forty-two adolescent females (ages 15-18 years) with overweight or obesity completed a social stress induction task in which they were told they would be rated by peers based on their photograph and profile. Participants were randomly assigned to one night of sleep deprivation or 9 h of sleep the night before undergoing fMRI while receiving positive and negative evaluations from their peers. After which, subjects participated in an ad libitum buffet. RESULTS: Sleep deprived, relative to nondeprived girls had distinct patterns of neural engagement to positive and negative evaluation in anterior, mid, and posterior aspects of midline brain structures. Moreover, a sleep deprivation-by-evaluation valence-by-caloric intake interaction emerged in bilateral dorsal anterior cingulate. Among sleep deprived girls, greater engagement during negative, but not positive, feedback was associated with lower caloric intake. This was not observed for nonsleep deprived girls. CONCLUSIONS: Results suggest an interaction between acute sleep loss and social evaluation that predicts emotion-related neural activation and caloric intake in adolescents. This research helps to elucidate the relationship between sleep loss, social stress, and weight status using a novel health neuroscience model.

An evaluation of a personal electronic device to enhance self-monitoring adherence in a pediatric weight management program using a multiple baseline design.

OBJECTIVE: To examine the effectiveness of a personal electronic device (PED) in order to improve adherence to self-monitoring of dietary intake and physical activity. METHOD: The impact of a PED on adherence to self-monitoring goals was examined in a multiple baseline design across three overweight adolescents. During baseline, a traditional paper-and-pencil method of self-monitoring was utilized. The subsequent study phase introduced a PED for self-monitoring. Percent self-monitoring goal attainment was the outcome of interest. RESULTS: During baseline, attainment of self-monitoring goals was low for all three participants (3-4%). Each subject's percent attainment of self-monitoring goal increased upon the introduction of the PED. For two of the three subjects this increase was stable (~75 and 100%) post-intervention. For the third subject the increase in percent attainment of self-monitoring goal was more variable but remained above baseline levels. CONCLUSION: PEDs have potential for improving self-monitoring in the context of behavioral weight management treatment for adolescents.

Weight-related criticism and self-perceptions among preadolescents.

OBJECTIVE: To examine the relationships among weight-related criticism (WRC), body size perceptions, and body size dissatisfaction among a sample of preadolescent children. METHOD: A community sample of 382 fifth and sixth graders (M age = 10.8) completed measures of WRC, nonweight-related criticism (NWRC), body size perceptions, body size dissatisfaction, and general self-esteem. Body mass index for each participant was collected during a standard school assessment. RESULTS: WRC was a significant and unique predictor of body size perceptions and body size dissatisfaction, controlling for actual BMI percentile and NWRC. Weight status moderated these relationships, with significant effects for WRC found only in the overweight group. NWRC was a significant predictor of self-esteem. DISCUSSION: The results suggest that WRC is specifically and uniquely associated with preadolescent children's body self-perceptions beyond its association with general, nonweight-related victimization. Prevention efforts may be needed to limit WRC and its potentially harmful effects.

Maternal self-efficacy is associated with mother-child feeding practices in middle childhood.

OBJECTIVE: Maternal self-efficacy (MSE) is a well-established correlate of health outcomes in young children, though little is known about this association in older children. The purpose of this cross-sectional study was to examine how MSE relates to mother-child feeding practices in middle childhood. METHODS: A total of 306 children ages 8-12 (Mean age = 9.72, SD = 0.91, 52.9% female) and their mothers participated in this study. Mothers completed the New General Self-Efficacy Scale and the Child Feeding Questionnaire. A series of hierarchical regression models were used to examine how MSE related to maternal food restriction, maternal pressure to eat, and maternal food monitoring. RESULTS: After accounting for maternal Body Mass Index (BMI), education, and age, and child Body Mass Index Percentile (BMI%ile) and age within the first step of each regression model, MSE emerged as a significant predictor for maternal restriction of foods (p = .024) and maternal food monitoring (p = .048). MSE was not significantly related to maternal pressure to eat. CONCLUSIONS: This study is the first to establish that higher MSE is significantly related to healthier mother-child feeding practices in middle childhood, providing preliminary justification for enhancing MSE within comprehensive family interventions to support child weight-related health.

Does iPhone night shift mitigate negative effects of smartphone use on sleep outcomes in emerging adults?

OBJECTIVES: Apple's iPhone Night Shift feature purports to reduce short-wavelength light emissions and improve sleep. We aimed to investigate these claims by comparing emerging adults' sleep outcomes associated with smartphone use before bed with iPhone's Night Shift enabled to two comparison conditions (iPhone use with no Night Shift, no iPhone use). DESIGN: Participants were randomly assigned to one of three conditions specifying iPhone use during the hour preceding bedtime for seven consecutive nights: iPhone use with Night Shift enabled; iPhone use with Night Shift disabled; and no phone use. SETTING: Participants were recruited from a western undergraduate university. PARTICIPANTS: A sample of 167 emerging adults (ages 18-24; 71.3% female) with iPhones participated in the study. MEASUREMENTS: Sleep outcomes (sleep latency, duration, efficiency and wake after sleep onset) were tracked using wrist-worn accelerometers. RESULTS: There were no significant differences in sleep outcomes across the three experimental groups. Post-hoc exploratory stratified analyses revealed a significant main effect of phone condition on sleep efficiency (P = .014) and WASO (P = .013) for participants averaging more than 6.8 hours of sleep per night, with the no phone condition demonstrating the best sleep outcomes. For those averaging less than 6.8 hours of sleep, there was no effect of phone condition on sleep outcomes. CONCLUSIONS: Across our full study sample, there were no differences in sleep outcomes attributable to Night Shift. For individuals who regularly obtained adequate sleep, abstaining from screen use resulted in better quality sleep than did phone use with Night Shift enabled.

Does inhibitory control training reduce weight and caloric intake in adults with overweight and obesity? A pre-registered, randomized controlled event-related potential (ERP) study.

A cognitive intervention that may reduce weight and caloric intake is inhibitory control training (ICT; having individuals repeatedly withhold dominant responses to unhealthy food images). We conducted a randomized controlled trial where 100 individuals with overweight or obesity were assigned to complete a generic (n = 48) or food-specific ICT (n = 52) training four times per week for four weeks. Weight and caloric intake were obtained at baseline, four-weeks, and 12-weeks. Participants also completed high-calorie and neutral go/no-go tasks while N2 event-related potential (ERP) data, a neural indicator of inhibitory control, was measured at all visits. Results from mixed model analyses indicate that neither weight, caloric intake, nor N2 ERP component amplitude towards high-calorie foods changed at post-testing or at the 12-week follow up. Regression analyses suggest that individuals with smaller N2 difference amplitudes to food may show greater weight loss and reductions in caloric intake after a generic ICT, while individuals with larger N2 difference amplitudes to food may show greater weight loss and reductions in caloric intake after a food-specific ICT. Overall, multiple food-specific or generic ICT sessions over the course of a four-week period do not affect overall weight loss, caloric intake, or N2 ERP amplitude.

Negative attitudes toward physical activity: measurement and role in predicting physical activity levels among preadolescents.

OBJECTIVES: To describe the development and validation of a measure of negative attitudes toward physical activity and examine the association between these attitudes and self-reported physical activity among preadolescents. METHOD: A school-based sample of 382 fifth and sixth graders (mean age = 10.8) completed measures of attitudes toward physical activity and self-reported physical activity. Body mass index data for the participants was collected as a part of a standard school health assessment. Exploratory factor analysis, confirmatory factor analysis, and structural equation modeling were utilized to test the factor structure and predictive value of attitudes toward physical activity. RESULTS: Results supported the reliability and concurrent validity of the negative attitudes measure and found a significant association between negative attitudes and physical activity. Negative attitudes was found to be a stronger predictor of physical activity than positive attitudes, which have been the focus of previous research in this area. CONCLUSIONS: The results suggest that negative attitudes toward physical activity can be reliably measured and may be an important target for intervention efforts to increase physical activity among children and adolescents.