The Study
Moderators of Caffeine's Effects on Jumping Performance in Females: A Systematic Review and Meta-Analysis.
This study looked at lots of smaller studies and found that when women drank caffeine, they often jumped a little higher. But we don’t know if those smaller studies were fair tests—maybe the women who got caffeine were already better jumpers. So we can’t say caffeine made them jump higher, just that they’re linked.
Analysis score
Maximum 85 for a systematic review with meta-analysis.
Where the score came from
This study looked at many smaller studies to see if drinking caffeine helps women jump higher during sports or exercise.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 545 / 100
Quality score
Systematic reviews and meta-analyses of cohort studies. They sit above a single cohort study but below a single randomized trial, because the underlying evidence is still observational.
Key takeaways
Summary
Based on the study abstract and findings.
- 1The improvement is small to moderate — enough to matter in competitive sports but not a huge change in everyday life.
- 2Caffeine helped women jump higher on average (effect size g = 0.28).
- 3The boost was bigger during the first half of their menstrual cycle (g = 0.52) than other times (g = 0.21–0.31).
- 4Both low (≤3 mg/kg) and high (>3 mg/kg) doses helped, and both types of jumps (countermovement and squat) improved similarly.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Journal of the American Nutrition Association
Year
2023
Authors
J. Grgic, Dorian Varović
Related Content
Claims (4)
In women, caffeine improves vertical jump performance more during the follicular phase of the menstrual cycle than during other phases.
Females who consume caffeine show a small to moderate increase in vertical jump height compared to those who do not, based on combined results from 15 studies.
In females, consuming caffeine improves vertical jump performance at both low doses (≤3 mg/kg) and high doses (>3 mg/kg), and the improvement is similar regardless of dose.
Females who consume caffeine show higher vertical jump performance in both countermovement and squat jump tests, with similar improvements in both types of jumps.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.