Identifying Mechanisms that Predict Obesity Using Ecological Momentary Assessment

描述（申请人提供）：在年轻人中，饮食失控与饮食病理学增加、一般心理社会问题和心理症状有关，1-6，并预示着体重过度增加7和饮食病理学恶化，包括全面综合征暴食症。10特别是在患病率估计约为30%的寻求治疗的样本中。2，11，12尽管存在不良相关性，但对暴食的病因学知之甚少，特别是促进暴食的即时过程。一个假设解释暴食的模型是人际关系模型，该模型假定人际关系问题先于并预测负面影响，这反过来又先于并预测暴食事件。或者可能不反映自然环境中的行为。本研究的目的是扩展现有的研究知识，通过使用流动监测，以检查在女孩的自然设置的人际关系模型的有效性。使用电子数字掌上电脑，将询问患有厌食症的女孩的互动和关系，情绪和饮食事件，因为它们在一天中发生，为期两周。因为数据表明，无法识别和报告情绪可能在饮食失调的个体中尤为突出，因此将通过自我报告和心率变异性双重衡量影响。本研究的具体目的包括以下几个方面：目的一：测试的可行性研究的人际关系模型的饮食在生态有效的和时间敏感的方式，使用动态监测。目的二：评估自我报告的负面情绪与心率变异性之间的瞬时关联。目标三：评估人际关系模型的有效性，该模型假设人际关系问题先于并预测消极情感，消极情感先于并预测暴食发作。参与者将是30名超重的青春期女孩，她们在评估前一个月报告了暴食事件。女孩的互动和关系，情绪和饮食事件的主观报告将在两周内使用数字掌上电脑全天分层间隔收集。将同时监测心率变异性两天。结果将阐明可能伴随或预测暴食的心理和生理机制，这有可能减少暴饮暴食或饮食病理学在整个发展过程中的出现。

DESCRIPTION (provided by applicant): In youth, loss of control (LOC) eating is associated with increased eating pathology and general psychosocial problems and psychological symptoms,1-6 and is predictive of excess weight gain7 and worsening eating pathology including full syndrome binge eating disorder.8 Rates of LOC eating among adolescent girls are high,9, 10 especially among treatment-seeking samples in which prevalence estimates are around 30%.2, 11, 12 Despite its adverse correlates, little is known about the etiology of LOC eating, specifically, the moment-to- moment processes that promote LOC. One model hypothesized to explain LOC eating is the Interpersonal Model, which posits that interpersonal problems precede and predict negative effect, which in turn precedes and predicts episodes of LOC eating.13 Many studies of LOC to date rely on self-report or laboratory assessment strategies, which are limited by the need for participants to summarize behaviors over weeks or months, or which may not reflect behavior in the natural environment. The present study aims to extend upon knowledge from existing research by using ambulatory monitoring to examine the validity of the Interpersonal Model of LOC in girls' naturalistic settings. Using electronic digital palm top computers, girls with LOC will be queried regarding their interactions and relationships, mood, and eating episodes, as they occur throughout the day, for a period of two weeks. Because data suggest that inability to identify and report emotions may be especially salient among individuals with disordered eating, affect will be dually measured by self-report and heart rate variability. Specific Aims of the current study include the following: Aim One: To test the feasibility of examining the Interpersonal Model of LOC eating in an ecologically valid and temporally sensitive manner using ambulatory monitoring. Aim Two: To evaluate momentary associations between self-reported negative affect and heart rate variability. Aim Three: To evaluate the validity of the Interpersonal Model which hypothesizes that interpersonal problems precede and predict negative affect and that negative affect precedes and predicts episodes of LOC eating. Participants will be 30 overweight adolescent girls who report episodes of LOC eating in the month prior to assessment. Subjective-reports of girls' interactions and relationships, mood, and eating episodes will be collected at stratified intervals throughout the day for two weeks using digital palm top computers. Heart rate variability will be concurrently monitored for two days. Results will illuminate psychosocial and physiological mechanisms that may accompany or predict LOC eating, which has potential to reduce the emergence of binge eating or eating pathology throughout development.