Seaton, A. M., Marks, C. R., Seaton, M. J., Engels, H. J., & Hew-Butler, T. (2013). Effects of acute caffeine intake on Wingate test performance in a creatine supplemented state. Medicine & Science in Sports & Exercise, 45(5), Supplement abstract number 1104.

This study investigated the effects of acute caffeine consumption on supramaximal exercise performance in a creatine monohydrate supplemented state in college-age adults (N = 14). Ss on a supplement-free diet performed a standard leg-cycle ergometry Wingate test to establish baseline performance characteristics for peak anaerobic power (watts/kg), mean anaerobic power (watts/kg), and rate of fatigue (%). Ss then underwent a creatine monohydrate supplementation intervention in the form of a 6-day loading phase (20 g/day) followed by a 3-day maintenance phase (5 g/day). Using a double-blind protocol and a randomized test order, at the beginning and conclusion of the maintenance phase, Ss completed a WanT 60 minutes after the acute intake of a placebo or 6 mg/kg caffeine.

There was a significant main effect for peak anaerobic power. Post-hoc analysis indicated that placebo peak anaerobic power performance scores were significantly higher than baseline peak anaerobic power. Similarly, caffeine peak anaerobic power performance scores were significantly higher than baseline peak anaerobic power. However there was no significant difference between placebo and caffeine. There were no significant main effects for rate of fatigue and mean anaerobic power.

Implication. The present data indicate 6 mg/kg acute caffeine consumption does not significantly affect creatine monohydrate loading’s impact on peak anaerobic power, mean anaerobic power, or rate of fatigue during a Wingate test.

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