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Caffeine and exercise performance. An update

S L Dodd1, R A Herb, S K Powers

  • 1Department of Exercise and Sport Sciences, University of Florida, Gainesville.

Sports Medicine (Auckland, N.Z.)
|January 1, 1993
PubMed
Summary
This summary is machine-generated.

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Caffeine enhances exercise performance, particularly during prolonged moderate-intensity workouts. Its ergogenic effects are likely due to adenosine receptor inhibition and increased fat metabolism, sparing muscle glycogen.

Area of Science:

  • Exercise Physiology
  • Nutritional Biochemistry
  • Pharmacology

Background:

  • Caffeine is a widely consumed ergogenic aid with proposed mechanisms including calcium handling, cyclic adenosine monophosphate (cAMP) accumulation, and adenosine receptor inhibition.
  • The precise cellular mechanisms underlying caffeine's ergogenic effects during exercise remain a subject of ongoing scientific debate.
  • Adenosine receptor antagonism is increasingly recognized as a key mechanism for caffeine's physiological effects at typical plasma concentrations.

Purpose of the Study:

  • To review and synthesize the current understanding of caffeine's cellular mechanisms of action during exercise.
  • To evaluate the evidence for caffeine's ergogenic potential across different exercise intensities and durations.
  • To identify the most likely mechanisms responsible for observed performance enhancements in humans.

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Main Methods:

  • Review of in vitro, in situ animal studies, and in vivo human exercise performance studies.
  • Analysis of research investigating caffeine's effects on skeletal muscle calcium handling, cAMP levels, and adenosine receptor activity.
  • Evaluation of studies examining performance outcomes during short-term high-intensity and prolonged moderate-intensity exercise protocols.

Main Results:

  • Animal studies with high caffeine doses show increased skeletal muscle force.
  • Human studies show inconsistent effects on high-intensity, short-term exercise performance.
  • Evidence supports caffeine as ergogenic for prolonged (>30 min), moderate-intensity exercise, potentially via a glycogen-sparing effect from increased lipolysis.

Conclusions:

  • Adenosine receptor inhibition is a significant mechanism for caffeine's ergogenic effects at non-toxic doses.
  • Caffeine's performance benefits are most consistently observed during prolonged, moderate-intensity exercise.
  • A caffeine-induced increase in lipolysis, leading to glycogen sparing, may explain performance enhancement in endurance activities.