减肥状态的生理学 (POWERS) 研究:评估能量平衡
Michael Rosenbaum1,2, Kelly C Allison3, Maren R Laughlin4
1Department of Pediatrics, Division of Molecular Genetics, Columbia University Irving Medical Center, New York, NY, USA.
International journal of obesity (2005)
|November 18, 2025
概括
了解减肥后的体重恢复至关重要. 权力研究在一年内测量能量平衡,包括摄入和消耗,以确定影响肥胖成年人体重恢复的因素.
科学领域:
- 身体生理学 身体生理学
- 代谢过程中的代谢.
- 肥胖问题研究研究
背景情况:
- 行为减肥干预措施很常见,但体重恢复仍然是一个重大挑战.
- 了解驱动重量恢复的生理因素对于开发有效的长期体重管理策略至关重要.
研究的目的:
- 描述在减肥状态生理学 (POWERS) 研究中评估能量平衡 (摄入和消耗) 的方法.
- 为了调查各种因素对重量恢复的贡献,在监督的行为减肥计划后重量恢复.
主要方法:
- 在POWERS研究中,招募了健康的成年人 (BMI 3040 kg/m2),其目标是减肥≥7%.
- 在基线,体重减轻后以及4个月和12个月时,使用双重标记水 (DLW) 和双重X射线吸收度 (DXA) 测量能量摄入和消耗.
- 能源支出的组成部分,包括休息能源支出 (REE) 和活动能源支出 (AEE),与身体组成的变化一起进行评估.
主要成果:
- 减肥后12个月体重变化是主要结果.
- 连续的DLW测量与DXA结合,评估脂肪和瘦肉质量的变化,这对于理解能量平衡动态至关重要.
- 详细评估能源消耗成分和饮食摄入量,可以全面了解代谢适应的情况.
结论:
- 本研究详细介绍了重量恢复的背景下评估能量平衡的理由和方法.
- 分析方法将身体重量和组成变化的数据规范化.
- 研究结果将揭示行为减肥后体重恢复的潜在生理机制.
相关概念视频
01:06Fats as Energy Storage Molecules
Triglycerides are a form of long-term energy storage molecules. They are made of glycerol and three fatty acids. To obtain energy from fat, triglycerides must first be broken down by hydrolysis into their two principal components, fatty acids and glycerol. This process, called lipolysis, takes place in the cytoplasm. The resulting fatty acids are oxidized by β-oxidation into acetyl-CoA, which is used by the Krebs cycle. The glycerol that is released from triglycerides after lipolysis directly...
01:25Metabolic States of the Body: The Absorptive State
During the absorptive state, which lasts approximately four hours after a meal, the body absorbs nutrients from the gastrointestinal tract. The carbohydrates, proteins, and lipids we consume are broken down into monosaccharides, amino acids, and free fatty acids for absorption. While carbohydrates and proteins are absorbed as-is, lipids are absorbed in their broken-down forms and then re-esterified into triglycerides within enterocytes before being packaged into chylomicrons. These absorbed...
01:18Metabolic States of the Body: The Postabsorptive State
The postabsorptive state usually starts about four hours after a meal and lasts until the next meal is eaten. During this time, the digestive system stops absorbing nutrients, and the body uses stored energy reserves to maintain stable blood glucose levels.
Initially, glycogen stored in the liver is broken down to release glucose into the bloodstream, while glycogen in the muscles is broken down to supply glucose for energy directly within the muscle cells. As glycogen stores diminish,...
Initially, glycogen stored in the liver is broken down to release glucose into the bloodstream, while glycogen in the muscles is broken down to supply glucose for energy directly within the muscle cells. As glycogen stores diminish,...
01:24Metabolic States of the Body: Fasting and Starvation
During the initial hours of fasting, the body uses up its glycogen stores as an energy source. Once these glycogen reserves are depleted, the body begins breaking down stored triglycerides and structural proteins. During this stage, glycerol becomes a key substrate for gluconeogenesis, while free fatty acids undergo beta-oxidation to provide energy for tissues, such as skeletal muscle. In the fasting state, the body spares protein breakdown as much as possible to conserve muscle and structural...
01:19Energy Balance
The human body gets energy from the three macronutrients: carbohydrates, proteins, and fats. Energy is released when the chemical bonds in the organic compounds present in the food are broken down. The energy content of food is measured in kilocalories (kcal), defined as the amount of heat required to raise the temperature of one kilogram of water by one degree Celsius. This value is determined by measuring the temperature change of the water surrounding a calorimeter after the complete...
01:25Self-Regulation
Self-regulation, also known as self-control, encompasses a range of cognitive and behavioral processes that allow individuals to adjust their internal states and outward actions to align with socially acceptable norms and long-term goals. It plays a fundamental role in adaptive functioning, from resisting impulsive behaviors to persisting through challenging tasks. While its benefits are widely recognized, self-regulation is not limitless. Muraven and Baumeister's theory posits that...