Nutrition
Caffeine Adenosine Receptor
Caffeine blocks adenosine receptors for alertness—it does not replace sleep, and daily habit blunts both ergogenic boost and withdrawal comfort.
Caffeine adenosine receptor blockade stops sleep-pressure signals temporarily—why coffee sharpens focus but does not replace lost sleep. More daily caffeine upregulates receptors over time, blunting ergogenic effect and worsening withdrawal headaches.
Only sleep clears adenosine fully. Peri-workout timing exploits blockade for sessions; cutoffs protect night recovery.
Common questions
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Does caffeine erase sleep debt?
No—it masks adenosine signaling briefly. Performance and health still need adequate nightly sleep; caffeine is a tool, not a sleep substitute.
Related terms
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