Bergstrom Haley C, Housh Terry J, Traylor Daniel A, Lewis Robert W, Cochrane Kristen C, Jenkins Nathaniel D M, Schmidt Richard J, Johnson Glen O, Housh Dona J, Cramer Joel T
1Department of Nutrition and Health Sciences, University of Nebraska-Lincoln, Lincoln, Nebraska; and 2College of Dentistry, University of Nebraska Medical Center, Lincoln, Nebraska.
J Strength Cond Res. 2014 Aug;28(8):2154-63. doi: 10.1519/JSC.0000000000000369.
Twenty-one men (mean ± SD; age = 23.5 ± 2.6 years, BMI = 26.0 ± 2.4 kg-1·m-2) completed this randomized, double-blinded, placebo-controlled, crossover study to examine acute responses to a thermogenic nutritional supplement. Each testing session included: (a) 30 minutes resting, followed by placebo or thermogenic nutritional supplementation, (b) 50 minutes postsupplementation resting, (c) 60 minutes walking, and (d) 50 minutes postexercise recovery. Gas exchange variables and heart rate (HR) were recorded during each phase. Blood pressure was recorded during all phases except exercise. Ratings of perceived exertion (RPE) were recorded only during exercise. There were no significant differences for any of the measures between the supplement and placebo during the initial resting or postsupplementation phases. During exercise, energy expenditure (EE) (placebo = 18.98-19.06 kJ·min-1 and supplement = 19.44-19.82 kJ·min-1) and VO2 (placebo = 11.27-11.35 ml·kg-1·min-1; supplement = 11.64-11.82 ml·kg-1·min-1) were greater for the supplement than placebo. There were no differences in respiratory exchange ratio (RER), HR, or RPE between the supplement and placebo during exercise. Postexercise, only VO2 (placebo = 3.53-3.63 ml·kg-1·min-1; supplement = 3.71-3.84 ml·kg-1·min-1) was greater for the supplement than placebo, but there were no differences in EE, RER, HR, or blood pressure. These findings suggested that the specific blend of ingredients in the thermogenic nutritional supplement, when combined with exercise, increased the metabolic rate with minimal changes in cardiovascular function and no effect on RPE.
21名男性（均值±标准差；年龄 = 23.5±2.6岁，体重指数 = 26.0±2.4kg⁻¹·m⁻²）完成了这项随机、双盲、安慰剂对照、交叉研究，以检验对一种产热营养补充剂的急性反应。每次测试环节包括：(a) 30分钟休息，随后服用安慰剂或产热营养补充剂，(b) 补充后休息50分钟，(c) 60分钟步行，以及(d) 运动后恢复50分钟。在每个阶段记录气体交换变量和心率（HR）。除运动阶段外，在所有阶段记录血压。仅在运动期间记录自觉用力程度（RPE）评分。在初始休息或补充后阶段，补充剂和安慰剂之间的任何测量指标均无显著差异。在运动期间，补充剂组的能量消耗（EE）（安慰剂组 = 18.98 - 19.06kJ·min⁻¹，补充剂组 = 19.44 - 19.82kJ·min⁻¹）和摄氧量（VO₂）（安慰剂组 = 11.27 - 11.35ml·kg⁻¹·min⁻¹；补充剂组 = 11.64 - 11.82ml·kg⁻¹·min⁻¹）高于安慰剂组。在运动期间，补充剂和安慰剂之间的呼吸交换率（RER）、HR或RPE没有差异。运动后，仅补充剂组的VO₂（安慰剂组 = 3.53 - 3.63ml·kg⁻¹·min⁻¹；补充剂组 = 3.71 - 3.84ml·kg⁻¹·min⁻¹）高于安慰剂组，但EE、RER、HR或血压没有差异。这些发现表明，产热营养补充剂中的特定成分组合与运动相结合时，可提高代谢率，同时心血管功能变化最小，且对RPE无影响。
