The Claim
In resistance-trained women, acute ingestion of caffeine at a dosage of 3 mg/kg increases countermovement jump height by 3.1% in the morning and by 1.6% in the afternoon, partially restoring afternoon performance levels, while having no effect on bench press throw peak velocity, maximal strength, or strength-endurance.
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.
In women who regularly train with weights, taking 3 mg of caffeine per kilogram of body weight before testing increases vertical jump height in the morning by 3.1% and in the afternoon by 1.6%, but does not change peak speed, maximum strength, or endurance during bench press throws.
See the scientific wording
In resistance-trained women, acute caffeine ingestion (3 mg/kg) increases countermovement jump height by 3.1% in the morning and 1.6% in the afternoon, partially restoring performance to afternoon levels, but has no effect on bench press throw peak velocity, maximal strength, or strength-endurance.
Caffeine blocks a chemical in the brain that slows down nerve signals, allowing the brain to send stronger signals to the leg muscles during quick jumps, making them contract faster and harder without affecting other muscles used in lifting or throwing.
What the research says
1 studyThis study found that when women who lift weights take a moderate dose of caffeine before exercising in the morning, they can jump higher—almost as high as they do in the afternoon. But it doesn’t help them lift heavier weights or throw the bench press faster.
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.