Metabolic, Cardiovascular, and Perceptual Responses to a Thermogenic Nutritional Supplement at Rest, During Exercise, and Recovery in Men
The Journal of Strength and Conditioning Research (Impact Factor: 2.08). 02/2014; 28(8). DOI: 10.1519/JSC.0000000000000369
Twenty-one men (mean ± SD; age = 23.5 ± 2.6 years, BMI = 26.0 ± 2.4 kg·m) completed this randomized, double-blinded, placebo-controlled, crossover study to examine acute responses to a thermogenic nutritional supplement. Each testing session included: 1) 30 min resting, followed by placebo or thermogenic nutritional supplementation; 2) 50 min post-supplementation resting; 3) 60 min walking; and 4) 50 min post-exercise 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 post-supplementation phases. During exercise, energy expenditure (EE) (placebo = 18.98-19.06 KJ·min and supplement = 19.44-19.82 KJ·min) and O2 (placebo = 11.27-11.35 ml·kg·min; supplement = 11.64-11.82 ml·kg·min) were greater for the supplement than placebo. There were no differences in RER, HR, or RPE between the supplement and placebo during exercise. Post-exercise, only O2 (placebo = 3.53-3.63 ml·kg·min; supplement = 3.71-3.84 ml·kg·min) 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.
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