New research suggests that caffeine can offer a measurable boost in endurance events, but the size of that advantage depends on dose, discipline, and how often an athlete already drinks coffee.
What the studies show
A review of 48 clinical trials found that even relatively small caffeine doses can help athletes complete time trials faster, with the clearest results appearing at moderate intake levels. In practical terms, doses around 1.3 to 3 mg per kilogram of body weight improved performance, while 4 to 6 mg/kg delivered an average gain of about 2.18%.
The evidence was strongest in cycling, followed by running, while rowing and other sports were less represented. Researchers noted that the response was not identical for everyone, pointing to a wide range of individual reactions.
Daily coffee habits matter
A separate sprint study from Dublin City University added an important detail: athletes who regularly consume more caffeine may feel less of a race-day lift. In that study, 18 male team-sport athletes completed repeated 40-meter sprints after using caffeinated gum. Those with lower daily caffeine intake held their pace better, while heavier coffee drinkers did not benefit as much across the full sprint set.
The takeaway is straightforward: caffeine can support performance, but it is not a universal shortcut. Too much may also bring jitters or stomach discomfort, which can offset any advantage.
The research also highlights a gap in the current evidence base, especially for women and for higher caffeine doses. For athletes, the most practical approach is to test caffeine during training and find a personal sweet spot before competition.
As sports science becomes more personalized, caffeine strategy may evolve from a simple boost into a tailored part of performance planning.