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the claim

Resistance to the ergogenic effect of caffeine is a real phenomenon.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
3 sources for · 0 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 resistance to the ergogenic effect of caffeine is a real phenomenon?

Yes. Evidence supports the existence of inter-individual variability and non-responsiveness to the ergogenic effects of caffeine.

Verdict: SUPPORTED · 3 sources for, 0 against · Last checked

The analysis

The claim is specific and testable regarding individual resistance or non-response to caffeine's ergogenic effects. Several retrieved papers highlight that caffeine does not work uniformly for everyone, noting heterogeneous responses and the existence of non-responders. Therefore, the verdict is SUPPORTED.

Evidence for · 3
Common questions and misconceptions about caffeine supplementation: what does the scientific evidence really show?
2024
The review notes that uncertainty persists regarding whether habitual consumption influences performance and whether caffeine works for everyone.
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J, A., DE, N., JR, S., B, A., M, G., LM, L., J, H., D, W., C, E., D, A., E, G., J, R., M, M., SC, F., J, G. L., T, Z., BD, M., D, C., M, S., & SM, A. (2024). Common questions and misconceptions about caffeine supplementation: what does the scientific evidence really show?. doi.org. https://doi.org/10.1080/15502783.2024.2323919

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More for · 2
Pre-Exercise Caffeine as a Modulator of Exercise-Induced Acute Cardiometabolic Responses: A Narrative Review.
2026
It emphasizes that the acute effects of caffeine are highly context-dependent and that individual responses can vary significantly based on various factors.
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H, G., Z, Z., L, M., M, Z., & Y, Z. (2026). Pre-Exercise Caffeine as a Modulator of Exercise-Induced Acute Cardiometabolic Responses: A Narrative Review.. doi.org. https://doi.org/10.3390/metabo16070478

Caffeine Supplementation Increases Muscle Strength, but Not Endurance, While Both Caffeine and Its Expectation Elevate Blood Lactate: A Balanced-Placebo Design Study.
2026
Research demonstrates that responses to caffeine are markedly heterogeneous, with a notable percentage of individuals classified as non-responders.
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EMKVK, S., CJG, d. C., SJ, I., GE, M., & KE, F. (2026). Caffeine Supplementation Increases Muscle Strength, but Not Endurance, While Both Caffeine and Its Expectation Elevate Blood Lactate: A Balanced-Placebo Design Study.. doi.org. https://doi.org/10.3390/nu18050801

What does the evidence say?

The claim is specific and testable regarding individual resistance or non-response to caffeine's ergogenic effects. Several retrieved papers highlight that caffeine does not work uniformly for everyone, noting heterogeneous responses and the existence of non-responders. Therefore, the verdict is SUPPORTED.

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