“Previous research has focused on caffeine itself as an aid to improve endurance,” Higgins said. “Coffee is a popular source of caffeine, so this paper looked at the research surrounding its ergogenic benefits.”
More than 600 scholarly articles were screened for those that focused only on caffeinated-coffee conditions, measured the caffeine dose and measured an endurance performance. Of these, 9 randomized control trials specifically used coffee to improve endurance.
Looking at the 9 trials, Higgins found that between 3 and 7 mg/kg of body weight of caffeine from coffee increased endurance performance by an average of 24%...
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