Blackcurrant juices and extracts containing anthocyanin may provide ergogenic benefits to sports performance. However, there are no studies examining the effects of coingestion of blackcurrant and caffeine. This investigation examined the effects of acute supplementation with a proprietary blackcurrant beverage administered in isolation or in combination with caffeine on repeated high-intensity cycling. Twelve well-trained male cyclists (mean ± SD: age, 39.5 ± 11.4 years; height, 177.9 ± 5.7 cm; weight, 78.2 ± 8.9 kg; and peak oxygen consumption, 4.71 ± 0.61 L/min) completed experimental sessions consisting of repeated (8 × 5 min) maximal intensity efforts. Four experimental treatments were administered in a double-blind, balanced Latin square design: blackcurrant + caffeine, blackcurrant + placebo, caffeine + placebo and placebo + placebo. Differences in power output, heart rate, oxygen consumption, muscle oxygen saturation, rate of perceived exertion, and cognitive function (Stroop) were compared between treatments using two-way repeated-measures analysis of variance and effect size analysis. There were no significant differences (p > .05) in either physiological or cognitive variables with any supplement treatment (blackcurrant + caffeine, blackcurrant + placebo, and caffeine + placebo) relative to placebo + placebo. Moreover, any observed differences were deemed trivial (d < 0.2) in magnitude. However, power output was lower (p < .05) in blackcurrant + placebo compared with blackcurrant + caffeine. A blackcurrant extract beverage administered in isolation or combination with caffeine provided no beneficial effect on cycling performance or physiological measures relative to a placebo control.

含有花青素的黑醋栗汁和提取物可为运动表现提供强效益处。然而，没有研究检查同时摄入黑醋栗和咖啡因的影响。这项调查研究了单独或与咖啡因联合使用的专有黑醋栗饮料对反复高强度循环的影响。12 名训练有素的男性自行车手（平均值 ±  SD：年龄，39.5 ± 11.4 岁；身高，177.9 ± 5.7 厘米；重量，78.2 ± 8.9 公斤；和峰值耗氧量，4.71 ± 0.61 L/min) 完成了由重复 (8 × 5 分钟) 最大强度努力组成的实验。四种实验性治疗以双盲、平衡的拉丁方设计进行：黑醋栗+咖啡因、黑醋栗+安慰剂、咖啡因+安慰剂和安慰剂+安慰剂。使用双向重复测量方差分析和效应量分析比较治疗之间功率输出、心率、耗氧量、肌肉氧饱和度、感知运动率和认知功能 (Stroop) 的差异。无显着差异（p > .05) 与安慰剂 + 安慰剂相比，任何补充治疗（黑醋栗 + 咖啡因、黑醋栗 + 安慰剂和咖啡因 + 安慰剂）的生理或认知变量。此外，任何观察到的差异 在幅度上都被认为是微不足道的 ( d < 0.2)。然而，与黑醋栗 + 咖啡因相比，黑醋栗 + 安慰剂的功率输出较低 ( p  < .05)。与安慰剂对照相比，单独服用或与咖啡因组合服用的黑加仑提取物饮料对循环性能或生理测量没有有益影响。