Alexandrou Elena, Herzberg Gene R, White Matthew D
School of Human Kinetics and Recreation, Memorial University, St. John's, NL A1C 5S7, Canada.
Can J Physiol Pharmacol. 2007 May;85(5):507-13. doi: 10.1139/y07-034.
The objective of this study was to assess how short-term feeding of high levels of dietary medium-chain triglyceride (MCT) affect energy expenditure and postprandial substrate oxidation rates in normal-weight, premenopausal women. Eight healthy women were fed both a MCT-rich and an isocaloric long-chain triglyceride (LCT)-rich diet for two 1-week periods separated by a minimum of 21 days. The energy intake in each diet was 45% carbohydrates, 40% fat, and 15% protein. The 2 diets had either 60.81% or 1.11% of total fat energy from MCT with the remaining fat energy intake from LCT. On days 1 and 7 of each diet, resting metabolic rate and postprandial energy expenditure (EE) were measured by indirect calorimetry with a ventilated hood. Results indicated on days 1 and 7, there were no significant differences between diets for resting metabolic rate or mean postprandial EE. On both days 1 and 7, fat oxidation for the MCT-rich diet was significantly greater (0.0001 </= p </= 0.04) than that for the LCT-rich diet at different time points across the 5.5 h postprandial period. In conclusion, for premenopausal, normal-weight women consuming a diet with 25% of the energy content from MCT, there were no changes in resting metabolic rate, transient increases in postprandial energy expenditure, and significant increases in postprandial fat oxidation.
本研究的目的是评估短期摄入高水平膳食中链甘油三酯（MCT）如何影响正常体重的绝经前女性的能量消耗和餐后底物氧化率。八名健康女性分别在两个为期1周的时间段内食用富含MCT的饮食和等热量的富含长链甘油三酯（LCT）的饮食，两个时间段之间至少间隔21天。每种饮食中的能量摄入为45%碳水化合物、40%脂肪和15%蛋白质。两种饮食中，MCT提供的脂肪能量分别占总脂肪能量的60.81%或1.11%，其余脂肪能量来自LCT。在每种饮食的第1天和第7天，使用通风面罩通过间接测热法测量静息代谢率和餐后能量消耗（EE）。结果表明，在第1天和第7天，两种饮食在静息代谢率或平均餐后EE方面没有显著差异。在第1天和第7天，富含MCT的饮食在餐后5.5小时的不同时间点的脂肪氧化均显著高于富含LCT的饮食（0.0001≤p≤0.04）。总之，对于能量含量25%来自MCT的绝经前、正常体重女性，静息代谢率没有变化，餐后能量消耗有短暂增加，餐后脂肪氧化显著增加。
