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Journal of the International Society of Sports Nutrition

, 4:7

First Online: 14 September 2007Received: 05 June 2007Accepted: 14 September 2007

Abstract

BackgroundThe purpose of this placebo-controlled, double-blind cross-over study was to compare the effects of two commercially available soft drinks on metabolic rate.

MethodsAfter giving informed consent, twenty healthy men and women were randomly assigned to ingest 12 ounces of Celsius™ and, on a separate day, 12 ounces of Diet Coke®. All subjects completed both trials using a randomized, counterbalanced design. Metabolic rate via indirect calorimetry and substrate oxidation via respiratory exchange ratio were measured at baseline pre-ingestion and at the end of each hour for 3 hours post-ingestion.

ResultsTwo-way ANOVA revealed a significant interaction p < 0.001 between trials in metabolic rate. Scheffe post-hoc testing indicated that metabolic rate increased by 13.8% + 0.6 L-min, p < 0.001 1 hr post, 14.4% +0.63 L-min, p < 0.001 2 hr post, and 8.5% +0.37 L-min, p < 0.004 3 hr post Celsius™ ingestion. In contrast, small ~4–6% but statistically insignificant increases in metabolic rate were noted following Diet Coke ingestion. No differences in respiratory exchange ratio were noted between trials.

ConclusionThese preliminary findings indicate Celsius™ has thermogenic properties when ingested acutely. The effects of repeated, chronic ingestion of Celsius™ on body composition are unknown at this time.

Electronic supplementary materialThe online version of this article doi:10.1186-1550-2783-4-7 contains supplementary material, which is available to authorized users.

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Author: Ron W Mendel - Jennifer E Hofheins

Source: https://link.springer.com/



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