Goldfield Gary S, Adamo Kristi B, Rutherford Jane, Legg Christine
Mental Health Research, Children's Hospital of Eastern Ontario Research Institute, Canada.
Physiol Behav. 2008 Feb 27;93(3):579-87. doi: 10.1016/j.physbeh.2007.10.022. Epub 2007 Nov 4.
The purpose of this study was to examine the independent and interactive effects of stress reactivity and binge eating (BE) status on changes in the relative reinforcing value of snack foods. The relative reinforcing value of snack foods was assessed in binge eaters and non-binge eaters across a stress-induction session (after 3-minutes of anticipation of giving a speech) or a control day (after 3-minutes of reading magazines), with order of conditions counterbalanced. Subjects were divided into four groups based on scores on the Binge Eating Scale (BES) and changes in perceived stress: Binge eaters/low stress reactivity (n=12), binge eaters/high stress reactivity (n=10), non-binge eaters/low stress reactivity (n=6), non-binge eaters/high stress reactivity (n=9). Dietary restraint, hunger, disinhibition, and hedonics were measured by self-report. Body composition was estimated by body mass index (BMI=weight in kilograms divided by height in metres squared). The relative reinforcing value of snack food was influenced differently by binge status and stress reactivity in the stress and control conditions (p<0.05). Binge eaters who reacted to stress earned more snack food points (p<0.001) in stress condition, but non-binge eaters who showed high stress reactivity earned less points for snack food in stress condition (p<0.05). This same pattern of results remained after statistically controlling for body mass index (BMI) and dietary restraint. Findings suggest that reactivity to interpersonal or ego-related stress increases the relative reinforcing value of food in binge eaters but decreases the relative reinforcing value of snack food in non-binge eaters, and these findings appear to be independent of dietary restraint and BMI.
本研究的目的是考察应激反应性和暴饮暴食（BE）状态对休闲食品相对强化价值变化的独立及交互作用。在应激诱导阶段（预期演讲3分钟后）或对照日（阅读杂志3分钟后），对应激反应性和暴饮暴食状态不同的人群进行分组，评估休闲食品的相对强化价值，条件顺序进行了平衡。根据暴饮暴食量表（BES）得分和感知应激变化，将受试者分为四组：暴饮暴食者/低应激反应性（n = 12）、暴饮暴食者/高应激反应性（n = 10）、非暴饮暴食者/低应激反应性（n = 6）、非暴饮暴食者/高应激反应性（n = 9）。通过自我报告测量饮食节制、饥饿感、去抑制和享乐主义。通过体重指数（BMI = 千克体重除以米平方身高）估算身体成分。在应激和对照条件下，暴饮暴食状态和应激反应性对休闲食品相对强化价值的影响不同（p<0.05）。对应激有反应的暴饮暴食者在应激条件下获得更多休闲食品点数（p<0.001），但高应激反应性的非暴饮暴食者在应激条件下获得的休闲食品点数较少（p<0.05）。在对体重指数（BMI）和饮食节制进行统计学控制后，这一相同的结果模式仍然存在。研究结果表明，对人际或自我相关应激的反应性增加了暴饮暴食者食物的相对强化价值，但降低了非暴饮暴食者休闲食品的相对强化价值，而且这些结果似乎与饮食节制和BMI无关。
