Abstract
The popularity of sport related commercial energy drinks and their purported benefit to performance mandates scrutiny. Purpose To evaluate the effect of a commercial energy drink (CED) (Red Bull) containing a combination of caffeine, carbohydrate, and taurine versus a matched flavor/volume placebo (P) on repeated anaerobic cycling performance. Methods In this double blind crossover design study, 13 recreational athletic male subjects (age 25.8 ± 8.5 yr, body mass (BM) 76.4 ± 11.2 kg) volunteered to perform two trials (CED vs. P) of repeated modified Wingate Anaerobic Power Tests (MWAPT) separated by 1 week and preceded one week by familiarization trials. The MWAPT consisted of 6 bouts of 15 second supramaximal cycling at a loading of .1kg/kg BM, with 45 seconds of active recovery between each bout. One hour prior to performing the MWAPT trials, subjects ingested equal volumes of either the CED or P fluids. Results Resting metabolic values for CED and P trials were significantly different (p<.05) for VO2 (463.5 ± 62 vs. 407.0 ± 79 mL/min), Ve (12.9 ± 2 vs. 9.9 ± 2 L/min), RER (.92 ± .03 vs. .82 ± .07), and HR (81 ± 14 vs. 70 ± 14 bpm), respectively. Dependent t tests showed no significant difference (P>.05) between trials or bouts 1–6 for Peak Power (PP), Total Work (TW), Fatigue Index (FI), and EPOC (E), and Total Fatigue Index (TFI). However, lactate (16.2 ± 1.5 vs. 14.3 ± 1.7 mmol) and exercise heart rate (171 ± 12 vs. 165 ± 15 bpm) were significantly different (p<.05) between CED and P trials, respectively. Conclusion The ingestion of a CED fluid significantly increased resting VO2, Ve, RER, HR, exercise HR, and post exercise lactate levels. However, it did not effect repeated anaerobic cycling performance.
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