Caffeine improves aerobic endurance exercise performance via central adenosine receptor antagonism
Caffeine is a well-established ergogenic aid that enhances performance primarily through antagonism of central adenosine A1 and A2a receptors. The most robust and consistent benefits are observed for aerobic endurance exercise, with effects on strength and power being more variable.
Evidence Score
Study Evidence
Study 1. Caffeine and human performance: from molecular mechanisms to exercise and recovery.
observationalLeng J, Yu J, Li Z, Zhang Y, Cui J · Frontiers in physiology (2026)
Result: Caffeine is a well-established ergogenic aid that enhances performance primarily through antagonism of central adenosine A1 and A2a receptors. The most robust and consistent benefits are observed for aerobic endurance exercise, with effects on strength and power being more variable.
Mechanism Graph
Limitations
- ⚠Effects on strength, power, and high-intensity intermittent performance are more variable and task-dependent
- ⚠Ergogenic response is highly individualized due to dose, timing, genetics, and habitual use
Frequently Asked Questions
How does caffeine improve exercise performance?▼
Caffeine primarily blocks adenosine receptors in the brain, reducing perceived effort and fatigue, increasing arousal, and modulating pain perception.
Is caffeine effective for all types of exercise?▼
The most consistent benefits are for aerobic endurance exercise; effects on strength, power, and high-intensity performance are more variable.
Does caffeine help with recovery after exercise?▼
Preliminary evidence suggests caffeine may accelerate muscle glycogen resynthesis when co-ingested with carbohydrates and improve muscle perfusion, but timing is critical to avoid sleep disruption.
Why do people respond differently to caffeine?▼
The response is highly individualized due to factors like genetics, habitual caffeine use, dose, and timing of intake.
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References
- 1.Leng J, Yu J, Li Z, Zhang Y, Cui J. "Caffeine and human performance: from molecular mechanisms to exercise and recovery.." Frontiers in physiology, 2026. PMID: 42495705 DOI: 10.3389/fphys.2026.1871149