Recovery
Caffeine
Caffeine is a naturally occurring stimulant found in coffee, tea, and many sports supplements that works by blocking adenosine receptors in the brain, reducing the perception of fatigue and effort during exercise. It is the most widely consumed and most thoroughly researched performance-enhancing supplement available, and one of the few that has consistent, meaningful effects on athletic performance across strength, power, and endurance sports.
What the evidence actually shows
The performance benefits of caffeine are well established for endurance exercise, where it reduces perceived effort and can extend time to exhaustion. Effects on strength and power performance are more moderate but still meaningful: research generally shows improvements in maximal strength, peak power output, and total training volume of three to seven percent with effective dosing. Reaction time and cognitive performance under fatigue also improve, which matters for sport performance beyond pure physical output. The effective dose for most athletes is three to six milligrams per kilogram of bodyweight, consumed thirty to sixty minutes before performance. Higher doses do not produce proportionally greater benefits and increase the risk of side effects.
What coaches should know
Caffeine’s effects are blunted in habitual high consumers. Athletes who drink multiple cups of coffee daily have built a tolerance that reduces the performance benefit significantly. Strategic reduction of habitual caffeine use in the days before competition can partially restore sensitivity. Coaches working with high school athletes should be aware that caffeine use is increasingly common in that population and that the combination of caffeine with inadequate sleep, which is nearly universal in adolescents, is not a performance strategy. It is a habit that masks fatigue without addressing its cause. The most honest recommendation for most athletes is that caffeine is a useful performance tool when used strategically, and a poor substitute for sleep and recovery when used as a daily crutch.
Related terms
Sleep · Readiness Score · Wellness Questionnaire · Work Capacity