The Claim
Six weeks of caffeine supplementation during resistance training has no significant effect on one-repetition maximum strength in the bench press or bench pull, or on muscular endurance at 60% of 1RM, in recreationally active men.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Taking caffeine supplements for six weeks while doing resistance training does not increase maximum strength in the bench press or bench pull, and does not improve the ability to perform repeated lifts at 60% of maximum capacity in recreationally active men.
See the scientific wording
Six weeks of caffeine supplementation during resistance training does not significantly improve one-repetition maximum strength in the bench press or bench pull, or muscular endurance at 60% of 1RM, in recreationally active men, indicating that any hypertrophic effect is not accompanied by enhanced strength or fatigue resistance.
Caffeine blocks adenosine receptors in the brain and muscles, but this does not increase how strongly nerves signal muscles to contract or how long muscles can keep working under load, so muscle size can grow without strength or endurance improving.
What the research says
1 studyTaking caffeine for six weeks while lifting weights may make your arm muscles a little bigger, but it won’t make you stronger or let you do more reps before getting tired — and that’s exactly what this study found.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.