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Wake up and smell the coffee: caffeine supplementation and exercise performance—an umbrella review of 21 published meta-analyses
Umbrella review (11 systematic reviews; 21 meta-analyses) concludes acute caffeine ingestion is ergogenic for aerobic endurance, muscle strength, muscle endurance, power, jumping performance, and exercise speed, with GRADE ratings often moderate but important limitations in women and older adults.
Design
- Type: umbrella review of published meta-analyses on caffeine ingestion vs control and exercise performance
- Included umbrella corpus: 11 reviews comprising 21 meta-analyses; reviews scored moderate or high methodological quality on AMSTAR-2
- Performance domains represented: aerobic endurance, muscle strength, muscle endurance, power, jumping performance, exercise speed
Headline pooled directions (authors)
- Caffeine was ergogenic in meta-analyses spanning the domains above
- GRADE: evidence quality was often moderate, with some endpoints graded low to very low depending on the underlying meta-analysis
- 95% prediction intervals: not every pooled analysis showed intervals definitively excluding null—inspect tables before overclaiming uniform benefit
Interpretation boundaries
- Demographics: most primary trials underlying the meta-analyses involved young men—authors call for more work in women, middle-aged, and older adults
- Aerobic vs anaerobic emphasis: narrative synthesis suggests larger typical effects for aerobic endurance than for some anaerobic outcomes—still domain-specific
- Delivery / dose: umbrella aggregates across capsule and beverage trials in constituent reviews; practical dosing should follow individual papers and clinician advice, not headline branding
Database placement
Primary hub: Caffeine for exercise performance (acute dosing) (caffeine-ergogenic-supplementation). Cross-linked from Resistance training (resistance-training) for programming-first readers.
Outcomes
- Performance ImprovementUmbrella synthesis: caffeine ergogenic vs placebo across meta-analyses for aerobic endurance, muscle strength, muscle endurance, power, jump performance, and exercise speed (GRADE often moderate; some analyses low–very low).
- otherMethods note: not all pooled endpoints had 95% prediction intervals excluding null—primary tables required before claiming universal subgroup benefit.
- otherPopulation caveat: constituent trials predominantly young men; generalisation to women and older adults limited in available meta-analytic corpus.