The Claim
The ergogenic effect of caffeine on vertical jumping performance in females is significantly greater during the follicular phase of the menstrual cycle (Hedges' g = 0.52) than during other phases (Hedges' g = 0.21–0.31), indicating that menstrual phase moderates caffeine's impact on explosive power.
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, caffeine improves vertical jump performance more during the follicular phase of the menstrual cycle than during other phases.
See the scientific wording
The ergogenic effect of caffeine on vertical jumping performance in females is significantly greater during the follicular phase of the menstrual cycle (Hedges' g = 0.52) compared to other phases (g = 0.21–0.31), suggesting menstrual phase may moderate caffeine's impact on explosive power.
During the first part of the menstrual cycle, higher estrogen levels make the brain more responsive to caffeine, which turns up the signal from the brain to the leg muscles, making them fire harder and faster when jumping.
What the research says
1 studyThis study found that caffeine helps women jump higher, and it works best during the first half of their menstrual cycle—like how some medicines work better at certain times.
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.