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Caffeine For Supramaximal Effort

Caffeine has been shown to help with exercise performance, but its effectiveness varies depending on the type of exercise and conditions of the study. Research recently published in the International Journal of Sport Nutrition and Exercise Metabolism investigates caffeine's impact on running performance at 115% of capacity.
 
Eighteen recreational male runners in the late 20s and early 30s took a graded exercise test one hour after consuming 6 mg of caffeine per kg of body weight or a placebo. Time to exhaustion for caffeine supplementing subjects was 11.3% higher compared to placebo. Running time ranged from an averaged 130.2 seconds with caffeine to 118.8% with placebo.