Bergstrom Haley C, Housh Terry J, Traylor Daniel A, Lewis Robert W, Jenkins Nathaniel D M, Cochrane Kristen C, Schmidt Richard J, Johnson Glen O, Housh Dona J
a Human Performance Laboratory, Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, 110 Ruth Leverton Hall, Lincoln, NE 68583-0806, USA.
Appl Physiol Nutr Metab. 2013 Sep;38(9):988-95. doi: 10.1139/apnm-2013-0029. Epub 2013 Apr 30.
This study examined acute physiologic responses to a thermogenic nutritional supplement at rest, during exercise, and during recovery from exercise in women. Twelve women (mean ± SD age, 22.9 ± 3.1 years) were recruited for this randomized, double-blinded, placebo-controlled, crossover study. Each testing session consisted of 4 phases: 30 min of presupplementation resting, followed by the ingestion of the placebo or thermogenic nutritional supplement; 50 min of postsupplementation resting; 60 min of walking (at 3.2-4.8 km·h(-1)); and 50 min of postexercise resting. Energy expenditure (EE), oxygen consumption, respiratory exchange ratio (RER), oxygen (O2) pulse, and heart rate (HR) values were recorded during all 4 phases. Systolic (SBP) and diastolic (DBP) blood pressure were recorded during the rest, postsupplementation, and postexercise recovery phases; ratings of perceived exertion (RPE) were recorded only during exercise. There were no significant differences for EE, oxygen consumption, O2 pulse, HR, SBP, or DBP between the supplement and placebo during the presupplementation resting or postsupplementation phases. The RER, however, was higher with the supplement at 30 min postsupplementation. During exercise, EE and O2 pulse were 3%-6% greater with the supplement than placebo; there were no significant differences in RPE. Postexercise, EE, oxygen consumption, and DBP were 3%-7% greater with the supplement than placebo. These findings suggest that a thermogenic nutritional supplement, when combined with exercise, increases metabolic rate but has no effect on the perception of effort and results in only minimal changes in cardiovascular function.
本研究考察了女性在静息状态、运动期间以及运动恢复过程中对一种产热营养补充剂的急性生理反应。12名女性（平均年龄±标准差为22.9±3.1岁）被招募参与这项随机、双盲、安慰剂对照的交叉研究。每个测试环节包括4个阶段：补充前静息30分钟，随后摄入安慰剂或产热营养补充剂；补充后静息50分钟；步行60分钟（速度为3.2 - 4.8 km·h⁻¹）；运动后静息50分钟。在所有4个阶段记录能量消耗（EE）、耗氧量、呼吸交换率（RER）、氧（O₂）脉搏和心率（HR）值。在静息、补充后和运动后恢复阶段记录收缩压（SBP）和舒张压（DBP）；仅在运动期间记录自觉用力程度（RPE）评分。在补充前静息或补充后阶段，补充剂组和安慰剂组在EE、耗氧量、O₂脉搏、HR、SBP或DBP方面无显著差异。然而补充剂组在补充后30分钟时RER更高。在运动期间，补充剂组的EE和O₂脉搏比安慰剂组高3% - 6%；RPE无显著差异。运动后，补充剂组的EE、耗氧量和DBP比安慰剂组高3% - 7%。这些发现表明，一种产热营养补充剂与运动相结合时，可提高代谢率，但对用力感知无影响，且对心血管功能仅产生极小的变化。
