Effects of Test Meal Volume and Energy Density on Gastric Volumes and Satiety Assessed by MRI
试验速览
- 阶段
- 不适用
- 状态
- 已完成
- 入组人数
- 18
- 试验地点
- 2
- 主要终点
- Total gastric content half emptying time T50
研究概览
简要总结
The GI MRI Research group at the University of Nottingham has been developing new, non-invasive magnetic resonance imaging (MRI) techniques to image the gastrointestinal tract. In collaboration with food manufacturer Unilever, the investigators want to image the abdomen of healthy volunteers after consumption of test meals of varying volume and energy density to determine levels of gastric distension and investigate possible correlations of this with the subjects' sense of satiety.
详细描述
The tone of the proximal stomach decreases on meal intake through a process of gastric accommodation, aimed at increasing the capacity of the stomach. An increased gastric volume progressively distends the stomach, and this distension has been shown to have an inverse relationship on appetite. The link is assumed to be based on activation of mechanoreceptors lying in the walls of the stomach. On activation, vagal discharges are triggered, leading to activation of hypothalamic neurons and regulation of feelings of satiety. Gasrtric emptying is also regulated by duodenal feedback mechanisms triggered by the arrival and amount of nutrients.
Based on current knowledge, a high volume test meal would be expected to produce more gastric distension and satiety over a low volume test meal, and a low energy density food would be expected to empty from the stomach faster than a high energy density food. Going on this premise, study test meal 2 would be expected to empty faster than study test meal 1. These phenomena will be investigated using non invasive Magnetic Resonance Imaging (MRI) methods. MRI can measure gastric volumes serially and non-invasively with high spatial resolution. Ultimately, the findings from this study will provide novel insights on mechanisms of gastric distension and satiety.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Crossover
- 主要目的
- Basic Science
- 盲法
- Double (Participant, Investigator)
入排标准
- 年龄范围
- 18 Years 至 60 Years（Adult）
- 性别
- Male
- 接受健康志愿者
- 是
入选标准
- •Apparently healthy; no medical conditions that might affect the study measurements (as determined by the study physician)
- •No use of medication that would interfere with the study measurements (as determined by the study physician)
- •No use of antibiotics in the 3 months before the study or during the study
- •No reported participation in another nutritional or biomedical trial 3 months before the study or during the study
- •Being used to eating 3 meals daily
- •BMI: 20 - 35 kg m-2
- •No reported participation in night shift work 2 weeks prior to the study or during the study
- •Not taking part in strenuous exercise ≤10 hours/week
- •Not consuming more than 21 alcoholic test meals in a typical week
- •Not presently a smoker
- •No reported weight loss or gain of more than 10 % of bodyweight for 6 months before the study
- •No eating disorder
- •No MRI contraindications; i.e absence of metal implants, infusion pumps and pacemakers, as assessed by a MRI safety screening questionnaire
排除标准
- •High or very high restrained eater
- •Use of any medically- or self-prescribed diet for the duration of the study
- •Allergies or food intolerances
研究组 & 干预措施
Study test meal 1
High volume, high energy density test meal. Volunteers will be given 490 mL of a high energy test meal once in the morning
干预措施: Study test meal 1 (Dietary Supplement)
Study test meal 2
High volume, low energy density test meal. Volunteers will be given 490 mL of a high volume low energy density test meal once in the morning
干预措施: Study test meal 2 (Dietary Supplement)
Study test meal 3
A low volume, high energy test meal. Volunteers will be given 140 mL high energy density test meal once in the morning.
干预措施: Study test meal 3 (Dietary Supplement)
结局指标
主要结局
Total gastric content half emptying time T50
时间窗: 0 - 240 mins
Total gastric volume at half the experimental time
次要结局
- Volumes of test meal in the stomach(0 - 240 mins)