Thermogenic Effect of Nutritionally Enriched Coffee Consumption

Abstract

PURPOSE: The purpose of this study was to examine the effect of nutritionally enriched JavaFit™ coffee (150 mg of caffeine, garcina cambogia (50% HCA), citrus aurantium extract (6%), and 75 mcg of chromium polynicotinate) on resting oxygen uptake (VO2), heart rate (HR), and blood pressure (BP) in healthy and physically active individuals. METHOD: Ten subjects (8 male, 2 female; 20.9 ± 1.7y; 178.1 ± 10.4 cm; 71.8 ± 12.1 kg; 51.9 ± 8.7 ml-kg-mirr1) underwent two testing sessions administered in a randomized and double-blind fashion. During each session, subjects reported to the Human Performance Laboratory after a 12-h fast and were provided either 354 ml (1.5 cups) of freshly brewed JavaFit™ (JF) or commercially available decaffeinated coffee (P). Subjects then rested in a semi-recumbent position for three hours. VO2 and HR were determined every 5 min during the first 30 min and every 10 min during the next 150 min. BP was determined every 15 min throughout the entire resting session. Area under the curve (AUC) analysis was computed for VO2, whereas a session-average was calculated for HR and BP. RESULTS: No differences in AUC for VO2 were observed between JF and P. However, further examination showed that 70% of the subjects (7 of 10) had a higher AUC for VO in JF compared to P during the three hour period. Subsequent statistical analysis showed this difference between JF and P in the responders was significantly different. In addition, the average systolic BP was higher (p <0.05) in JF (118 ± 7 mmHg) than P (115 ± 8 mmHg) in both the total sample and the subgroup of responders. No differences in average HR and average diastolic BP were observed between JF and P in both the total sample and the subgroup of responders. CONCLUSION: It appears that consuming a nutritionally-enriched coffee beverage may increase resting energy expenditure in individuals that are sensitive to this caffeine and herbal coffee supplement. In addition, this supplement also appears to affect cardiovascular dynamics by augmenting arterial blood pressure.