The Claim
Caffeine ingestion at 6 mg/kg in healthy young females reduces perceived exertion during fatiguing isometric exercise by approximately 20% without altering core body temperature, indicating that its ergogenic effect is not mediated by thermoregulatory changes.
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.
When healthy young women consume 6 mg of caffeine per kilogram of body weight before performing fatiguing isometric exercise, their perception of effort decreases by about 20%, and their core body temperature does not change.
See the scientific wording
Caffeine ingestion at 6 mg/kg in healthy young females reduces perceived exertion during fatiguing isometric exercise by approximately 20% without altering core body temperature, indicating that its ergogenic effect is not mediated by thermoregulatory changes.
Caffeine enters the brain and blocks signals that tell the nervous system to feel tired. This allows the brain to send stronger signals to the muscles, so the person can keep pushing harder without feeling as much effort, even when the muscles are fatiguing.
What the research says
1 studyStudy: Caffeine ingestion improves morning neuromuscular performance to evening levels in healthy females.
This study found that when women took a standard caffeine dose before a tough knee exercise, they felt less tired—even though their body temperature didn’t go up. That means caffeine helps them feel stronger not by warming them up, but by changing how their brain feels effort.
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.