Research summary · Nutrition and supplements
Caffeine did not improve knee-extension performance in this trial
Thirty young men, half resistance-trained, completed laboratory knee-extension tests after placebo or two caffeine doses in randomized order. Researchers assessed maximal torque at three speeds, fatigue across repeated contractions and neuromuscular signals.
- Publication year
- 2026
- First published online
- Publication type
- Randomized placebo-controlled crossover experiment
- Journal
- Journal of Strength and Conditioning Research
- Population / context
- Resistance-trained and nonresistance-trained men
What the publication reports
Neither tested dose produced a clear improvement in maximal strength, fatigue resistance or measured neuromuscular activity compared with placebo in either training-status group.
Limits and interpretation
The small, male-only sample and isolated knee-extension task limit generalization to whole-body exercise or competition. These null findings do not establish that caffeine is ineffective for every sport. The high experimental doses are not individualized supplementation recommendations.
Read the source
Consult the original record for the full author list, methods, references, funding and competing-interest disclosures.
Effects of Acute Caffeine Supplementation on Isokinetic Strength and Fatigue in Resistance-Trained vs. Nonresistance-Trained Individuals
Original publication / indexed recordPMID: 42853632DOI: 10.1519/JSC.0000000000005702Reader discussion
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