Espel Hallie M, Muratore Alexandra F, Lowe Michael R
Department of Psychology, Drexel University, Philadelphia, PA, USA.
Department of Psychology, Drexel University, Philadelphia, PA, USA.
Appetite. 2017 Oct 1;117:9-16. doi: 10.1016/j.appet.2017.06.004. Epub 2017 Jun 7.
Loss-of-control (LOC) eating episodes represent one form of dysregulated eating common to full- and sub-threshold eating disorders. Extensive evidence suggests that impulsivity, particularly in the context of negative affect and/or depression, may play an important etiological role in the development and maintenance of LOC eating. However, most prior studies have considered LOC eating as a dichotomous rather than dimensional construct, and few studies have considered the interaction of multiple dimensions of impulsivity while also accounting for the role of depressive symptoms. The present study examined the independent and interacting effects of two facets of impulsivity-response inhibition and negative urgency-on LOC eating episode severity and frequency among college women (N = 102). Depressive symptom severity was included as a covariate. Results indicated that greater negative urgency was associated with greater LOC severity; this effect was moderated by response inhibition, such that the effect of urgency was particularly pronounced for individuals with higher response inhibition capacity. Negative urgency was the only significant predictor of LOC frequency. Depression had no significant effect on either LOC severity or frequency (ps ≥ 0.16). Results support the importance of considering multiple facets of impulsivity in predicting LOC eating behavior, and further indicate that factors influencing subjective severity and frequency of LOC may be distinct.
失控（LOC）饮食发作是完全型和亚临界型饮食失调中常见的一种饮食失调形式。大量证据表明，冲动性，尤其是在消极情绪和/或抑郁的背景下，可能在LOC饮食的发展和维持中起重要的病因作用。然而，大多数先前的研究将LOC饮食视为一种二分法而非维度结构，很少有研究考虑冲动性多个维度的相互作用，同时也考虑抑郁症状的作用。本研究考察了冲动性的两个方面——反应抑制和消极紧迫性——对102名大学女生LOC饮食发作严重程度和频率的独立和交互作用。抑郁症状严重程度作为协变量纳入。结果表明，更高的消极紧迫性与更高的LOC严重程度相关；这种效应受到反应抑制的调节，即对于反应抑制能力较高的个体，紧迫性的效应尤为明显。消极紧迫性是LOC频率的唯一显著预测因素。抑郁对LOC严重程度或频率均无显著影响（p值≥0.16）。结果支持在预测LOC饮食行为时考虑冲动性多个方面的重要性，并进一步表明影响LOC主观严重程度和频率的因素可能是不同的。
