Department of Communication and Education, Universidad Loyola Andalucía, 41704 Dos Hermanas, Spain.
SER Research Group, Department of Physical Activity and Sport Sciences, Center of Higher Education Alberta Giménez, Affiliated to Pontifical University of Comillas, 07013 Palma, Spain.
Nutrients. 2023 Dec 21;16(1):29. doi: 10.3390/nu16010029.
caffeine is an ergogenic aid that still needs to be investigated in women's sports performance.
Eight semi-professional women's volleyball players (height = 1.63 ± 0.08 m; weight = 66.67 ± 4.74 kg) voluntarily participated in this study. A randomized crossover design was implemented where players underwent caffeine and placebo conditions. In the caffeine condition, participants consumed 5 mg/kg of caffeine based on their body weight before acute training. The evaluations were performed over two weeks of training. In both conditions, the countermovement jump, repeated jumps for 15 s, and handgrip tests were performed. The change of direction was assessed using the 505 test. Well-being was also assessed with a wellness questionnaire. A repeated measures ANOVA and correlation analysis were performed.
The repeated measures ANOVA revealed a main effect of supplementation ( (1.7) = 8.41, = 0.02, η2 = 0.54) across the training week on physical performance. Additionally, there was a positive effect on perceived fatigue ( (1.7) = 7.29, = 0.03, η2 = 0.51).
Caffeine improved performance and fatigue parameters over one week of training. Further research is needed on women, focusing on physical performance and wellbeing, especially during intense periods.
咖啡因是一种运动表现增强剂，但仍需要在女性运动中进行研究。
8 名半职业女子排球运动员（身高=1.63±0.08 m；体重=66.67±4.74 kg）自愿参加了这项研究。采用随机交叉设计，运动员接受咖啡因和安慰剂条件。在咖啡因条件下，参与者根据体重摄入 5mg/kg 的咖啡因，在急性训练前摄入。评估在两周的训练中进行。在两种情况下，都进行了纵跳、15 秒重复跳跃和握力测试。使用 505 测试评估变向能力。通过健康问卷评估幸福感。进行重复测量方差分析和相关性分析。
重复测量方差分析显示，在整个训练周内，补充剂有一个主要的影响（(1.7)=8.41，=0.02，η2=0.54）对身体表现的影响。此外，对疲劳的感知也有积极影响（(1.7)=7.29，=0.03，η2=0.51）。
咖啡因在一周的训练中提高了运动表现和疲劳参数。需要对女性进行进一步的研究，重点关注身体表现和幸福感，特别是在高强度时期。
