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the claim

Caffeine taken before exercise improves athletic performance in endurance and strength tasks.

the verdict
CONTESTED PARTIAL
Recorded sources
8 sources for · 1 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that caffeine taken before exercise improves athletic performance in endurance and strength tasks?

Partly. Multiple small trials and a meta-analysis report that caffeine taken before exercise improves endurance performance, though one small trial found no additive benefit. Evidence on strength tasks is inconsistent, so the strength half of the claim is not established.

Verdict: CONTESTED PARTIAL · 8 sources for, 1 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 8
Caffeine Improves Physical and Cognitive Performance during Exhaustive Exercise
2008
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Caffeine Improves Physical and Cognitive Performance during Exhaustive Exercise. (2008). doi.org. https://doi.org/10.1249/mss.0b013e31817bb8b7

Evidence against · 1
Effect of Caffeine Co‐Ingested with Carbohydrate or Fat on Metabolism and Performance in Endurance‐Trained Men
2001
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Effect of Caffeine Co‐Ingested with Carbohydrate or Fat on Metabolism and Performance in Endurance‐Trained Men. (2001). doi.org. https://doi.org/10.1113/eph8602072

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More for · 7
Acute Ketone Salts–Caffeine–Taurine–Leucine Supplementation but not Ketone Salts–Taurine–Leucine, Improves Endurance Cycling Performance
2022
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Quinones, M. D. & Lemon, P. W. (2022). Acute Ketone Salts–Caffeine–Taurine–Leucine Supplementation but not Ketone Salts–Taurine–Leucine, Improves Endurance Cycling Performance. doi.org. https://doi.org/10.1123/ijsnem.2021-0309

Does caffeine have an impact on endurance, strength or team sport performance? A Systematic Review of the recent findings
2026
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Miłek, B., Lenart, J., Wadowska, Z., Janowiak, J., Janik, N., Sobiś, M., Górowska, A., Bogacka, A., Kiersznowska, N., & Buchman, M. (2026). Does caffeine have an impact on endurance, strength or team sport performance? A Systematic Review of the recent findings. doi.org. https://doi.org/10.12775/qs.2026.49.67086

International society of sports nutrition position stand: caffeine and exercise performance -
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International society of sports nutrition position stand: caffeine and exercise performance - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.1186/s12970-020-00383-4

The Effect of Acute Caffeine Ingestion on Endurance Performance: A Systematic Review and Meta-Analysis.
2018
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Southward, K., Rutherfurd-Markwick, K. J., & Ali, A. (2018). The Effect of Acute Caffeine Ingestion on Endurance Performance: A Systematic Review and Meta-Analysis.. doi.org. https://doi.org/10.1007/s40279-018-0939-8

Caffeine Improves Triathlon Performance: A Field Study in Males and Females
2018
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Caffeine Improves Triathlon Performance: A Field Study in Males and Females. (2018). doi.org. https://doi.org/10.1123/ijsnem.2017-0165

Caffeine ingestion and muscle metabolism during prolonged exercise in humans
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Caffeine ingestion and muscle metabolism during prolonged exercise in humans. (n.d.). cir.nii.ac.jp. https://doi.org/10.1152/ajpendo.1992.262.6.e891

Metabolic, catecholamine, and exercise performance responses to various doses of caffeine
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Metabolic, catecholamine, and exercise performance responses to various doses of caffeine. (n.d.). cir.nii.ac.jp. https://doi.org/10.1152/jappl.1995.78.3.867

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