A new analysis found that caffeine improved agility and vertical jump performance in female athletes competing in intermittent sports, though evidence remains too limited to support menstrual cycle-based timing recommendations.
By yourNEWS Media Newsroom
Caffeine may provide a measurable performance advantage for female athletes in sports that require quick movement, repeated bursts of effort and explosive jumping, according to a new systematic review and meta-analysis published in Frontiers in Nutrition.
Researchers reviewed nine studies involving 118 female athletes competing in handball, volleyball and basketball. The analysis examined whether caffeine supplementation improved performance in intermittent sports and whether menstrual cycle phase changed the effect.
The findings showed that caffeine significantly improved agility and vertical jump height, with small-to-moderate effects. Sprint performance did not show a significant improvement.
The review adds to decades of research identifying caffeine as one of the most studied performance aids in sports nutrition. Caffeine is known to stimulate the central nervous system and increase catecholamine production, which can support energy use, alertness and neuromuscular performance during exercise.
Earlier research has linked caffeine to improvements in both aerobic and anaerobic activities, including endurance events and repeated high-intensity efforts. A 2006 study in amateur male athletes found that a caffeine dose of 6 milligrams per kilogram of body weight improved sprint performance compared with placebo during two 36-minute exercise sessions.
The new review focused specifically on women, a population that has often been underrepresented in sports nutrition research.
Across the included studies, caffeine doses ranged from 3 to 6 milligrams per kilogram of body mass. The caffeine was typically consumed about 60 minutes before exercise.
For a 140-pound athlete, that would equal roughly 190 to 380 milligrams of caffeine. Researchers noted that tolerance can vary, and those amounts may not be appropriate for every athlete.
The strongest findings involved agility and vertical jump height. Those outcomes are especially relevant for sports such as basketball, volleyball and handball, where athletes repeatedly jump, cut, accelerate, decelerate and change direction.
Sprint performance, however, did not significantly improve. Researchers said sprinting is a highly anaerobic, fast-twitch-dominant activity, and caffeine’s typical mechanisms may not transfer as clearly to all-out short-burst efforts. Caffeine may better support tasks involving alertness, coordination, reaction, neuromuscular signaling and repeated movement patterns than isolated maximal sprinting.
The researchers also examined whether caffeine’s effects differed depending on menstrual cycle phase.
Female hormones fluctuate across the cycle, with estrogen generally rising during the follicular phase and progesterone peaking during the luteal phase. Estrogen is often associated with anabolic effects that help support muscle and bone, while progesterone has been linked to more catabolic effects on protein metabolism.
Some women report feeling more energetic during the follicular phase and more fatigued during the luteal phase. BrightU.AI’s Enoch engine notes that rising progesterone levels can leave some women feeling slowed down or moody, which may make the luteal phase a time when some athletes reduce training intensity.
Because of these hormonal changes, researchers explored whether caffeine might work differently across cycle phases.
Within-phase analyses suggested that agility improvements appeared more pronounced during the follicular phase, when estrogen is rising. Effects during the luteal phase were less consistent.
However, comparisons between phases were not statistically significant. Researchers said the evidence is too limited to draw firm conclusions about whether women should time caffeine intake based on menstrual cycle phase.
A major limitation was how the included studies tracked the cycle. All nine relied on calendar-based methods or self-reported cycle tracking apps. None confirmed menstrual phase through hormonal testing. Without verified hormone levels, researchers said it is difficult to make reliable phase-specific recommendations.
For now, the review supports caffeine as a legitimate performance aid for female athletes in intermittent sports, especially for agility and explosive power. It does not support firm cycle-synced caffeine guidance.
The findings also highlight how little research has focused specifically on female athletes. Only nine eligible studies and 118 total participants were included, underscoring the need for larger, better-controlled trials that account for female physiology and confirm menstrual cycle phase with hormonal measures.
For athletes in volleyball, basketball and handball, the practical takeaway is that caffeine taken about an hour before activity may help with agility and jump performance. Athletes should consider their own tolerance, sleep schedule, anxiety sensitivity and overall caffeine intake before using it regularly.
The review suggests caffeine can offer a performance edge, but the science on menstrual cycle timing remains unsettled.
Source: Natural News
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