(1978), who demonstrated an increase in cycling time to exhaustion following coffee consumption.
Caffeine was first shown to improve exercise performance by Costill et al. Coffee and caffeine anhydrous may be considered suitable pre-exercise caffeine sources for high-intensity exercise.Ĭaffeine is the most widely consumed psychoactive substance in the world, with estimates of average daily intakes as high as 4 mg/kg of bodyweight in US adults ( Barone & Roberts, 1996). Neither COF nor CAF improved strength outcomes more than PLA, while both groups attenuated sprint power reductions to a similar degree.
For PLA, significant reductions were observed in sprint 4 PP, sprint 2 TW, sprint 4 TW, and average TW significant reductions were not observed with CAF or COF. 95% confidence intervals revealed a significant improvement in sprint 1 TW for CAF, but not COF or PLA. There were no sprint × treatment interactions for PP or TW (p>0.05). Significant interactions were not observed for BP 1RM, BP RTF, or LP RTF (p>0.05). LP 1RM was improved more by COF than CAF (p=0.04), but not PLA (p=0.99). At least 48 hours later, participants returned and ingested a beverage containing CAF (300 mg flat dose yielding 3–5 mg/kg bodyweight), COF (8.9 g 303 mg caffeine), or placebo (PLA 3.8 g noncaloric flavoring) 30 minutes before testing. Peak power (PP) and total work (TW) were recorded for each sprint. Participants then completed five, ten-second cycle ergometer sprints separated by one minute of rest. Fifty-four resistance-trained males completed strength testing, consisting of one-rep max (1RM) and repetitions to fatigue (RTF) at 80% of 1RM for leg press (LP) and bench press (BP). The purpose of the current study was to compare the effects of acute coffee (COF) and caffeine anhydrous (CAF) intake on strength and sprint performance. Caffeine and coffee are widely used among active individuals to enhance performance.
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