Green Tea Research Today is a free monthly online journal that collates and summarizes the latest research about Green Tea, including details on benefits, antioxidants, weight loss, diet, side effects. | ||||||||
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Acute effects of ingesting Java FitTM energy extreme functional coffee on resting energy expenditure and hemodynamic responses in male and female coffee drinkers.Taylor LW, Wilborn CD, Harvey T, Wismann J, Willoughby DS
ABSTRACT: 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 [JavaFitTM 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. CONCLUSIONS: Results from this study suggest that JavaFitTM 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. Published 8 October 2007 in J Int Soc Sports Nutr, 4(1): 10.
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