Research article
Acute effects of ingesting Java Fit™ energy extreme functional coffee on resting energy expenditure and hemodynamic responses in male and female coffee drinkers
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* Corresponding author: Darryn S Willoughby Darryn_Willoughby@baylor.edu
1 Exercise Biochemistry Laboratory, Department of Health, Leisure, and Exercise Science, the University of West Florida, Pensacola, FL, USA
2 Department of Exercise and Sport Science, University of Mary-Hardin Baylor, Belton, TX, USA
3 Department of Physical Education Center for Physical Development Excellence, United States Military Academy, West Point, NY 10996 USA
4 Exercise and Biochemical Nutrition Laboratory, Center for Exercise, Nutrition, and Preventive Health Research, Department of Health, Human Performance, and Recreation, Baylor University, Waco, TX, USA
Journal of the International Society of Sports Nutrition 2007, 4:10 doi:10.1186/1550-2783-4-10
Published: 5 October 2007Abstract
Background
The purpose of this study was to examine the effects of a functional coffee beverage containing additional caffeine, green tea extracts, niacin and garcinia cambogia to regular coffee to determine the effects on resting energy expenditure (REE) and hemodynamic variables.
Methods
Subjects included five male (26 ± 2.1 y, 97.16 ± 10.05 kg, 183.89 ± 6.60 cm) and five female (28.8 ± 5.3 y, 142.2 ± 12.6 lbs) regular coffee drinkers. Subjects fasted for 10 hours and were assessed for 1 hour prior (PRE) and 3 hours following 1.5 cups of coffee ingestion [JavaFit™ Energy Extreme (JF) ~400 mg total caffeine; Folgers (F) ~200 mg total caffeine] in a double-blind, crossover design. REE, resting heart rate (RHR), and systolic (SBP) and diastolic (DBP) blood pressure was assessed at PRE and 1, 2, and 3-hours post coffee ingestion. Data were analyzed by three-factor repeated measures ANOVA (p < 0.05).
Results
JF trial resulted in a significant main effect for REE (p < 0.01), SBP (p < 0.01), RER (p < 0.01), and VO2 (p < 0.01) compared to F, with no difference between trials on the RHR and DBP variables. A significant interaction for trial and time point (p < 0.05) was observed for the variable REE. The JF trial resulted in a significant overall mean increase in REE of 14.4% (males = 12.1%, females = 17.9%) over the observation period (p < 0.05), while the F trial produced an overall decrease in REE of 5.7%. SBP was significantly higher in the JF trial; however, there was no significant increase from PRE to 3-hours post.
Conclusion
Results from this study suggest that JavaFit™ Energy Extreme coffee is more effective than Folgers regular caffeinated coffee at increasing REE in regular coffee drinkers for up to 3 hours following ingestion without any adverse hemodynamic effects.