Mixed
Acute caffeine supplementation (6 mg/kg) improves cycling time-trial performance regardless of habitual caffeine consumption levels (low, moderate, or high).
If you consume caffeine regularly, you do not need to stop or reduce your intake before using caffeine as a performance supplement. A standard dose of 6 mg per kg of body weight taken 60 minutes before exercise will improve your performance just as much for high consumers as it does for non-consumers. There is no need for a multi-day withdrawal period.
Performance effects of acute caffeine supplementation during a ~30 min cycling TT performance were not influenced by the level of habitual caffeine consumption.
Why this rating
Double-blind, crossover, counterbalanced design with a relatively large sample size (n=40) for this type of study, though limited to male cyclists.
Source
Dispelling the myth that habitual caffeine consumption influences the performance response to acute caffeine supplementation
Lívia de Souza Gonçalves et al. · Journal of Applied Physiology · 2017
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