Research article
Metabolic responses to the acute ingestion of two commercially available carbonated beverages: A pilot study
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* Corresponding author: Ron W Mendel ron@ohioresearchgroup.com
1 Ohio Research Group – Division of Exercise Science and Sports Nutrition, Wadsworth Medical Center, Wadsworth, Ohio, 44281, USA
2 Department of Human Performance & Sport Management, Mount Union College, Alliance, Ohio, 44601, USA
Journal of the International Society of Sports Nutrition 2007, 4:7 doi:10.1186/1550-2783-4-7
Published: 14 September 2007Abstract
Background
The purpose of this placebo-controlled, double-blind cross-over study was to compare the effects of two commercially available soft drinks on metabolic rate.
Methods
After 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.
Results
Two-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.
Conclusion
These 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.