There is growing evidence that caffeine and coffee ingestion prior to exercise provide similar ergogenic benefits. However, there has been a long-standing paradigm that habitual caffeine intake may influence the ergogenicity of caffeine supplementation. The aim of the present study was to investigate the effect of habitual caffeine intake on 5-km cycling time-trial performance following the ingestion of caffeinated coffee. Following institutional ethical approval, in a double-blind, randomized, crossover, placebo-controlled design, 46 recreationally active participants (27 men and 19 women) completed a 5-km cycling time trial on a cycle ergometer 60 m in following the ingestion of 0.09 g/kg coffee providing 3 mg/kg of caffeine, or a placebo. Habitual caffeine consumption was assessed using a caffeine consumption questionnaire with low habitual caffeine consumption defined as <3 and ≥6 mg · kg⁻¹ · day⁻¹ defined as high. An analysis of covariance using habitual caffeine intake as a covariant was performed to establish if habitual caffeine consumption had an impact on the ergogenic effect of coffee ingestion. Sixteen participants were classified as high-caffeine users and 30 as low. Ingesting caffeinated coffee improved 5-km cycling time-trial performance by 8 ± 12 s; 95% confidence interval (CI) [5, 13]; p < .001; d = 0.30, with low, 9±14 s; 95% CI [3, 14]; p = .002; d = 0.18, and high, 8 ± 10 s; 95% CI [−1, 17]; p = .008; d = 0.06, users improving by a similar magnitude, 95% CI [−12, 12]; p = .946; d = 0.08. In conclusion, habitual caffeine consumption did not affect the ergogenicity of coffee ingestion prior to a 5-km cycling time trial.

越来越多的证据表明，运动前摄入咖啡因和咖啡可提供类似的增效益处。然而，长期存在的范式认为，习惯性的咖啡因摄入可能会影响咖啡因补充剂的增效性。本研究的目的是调查在摄入含咖啡因的咖啡后，习惯性摄入咖啡因对 5 公里自行车计时赛表现的影响。在获得机构伦理批准后，在一项双盲、随机、交叉、安慰剂对照设计中，46 名娱乐活动参与者（27 名男性和 19 名女性）在摄入 60 米的自行车测力计上完成了 5 公里的自行车计时试验。 0.09 g/kg 咖啡提供 3 mg/kg 咖啡因，或安慰剂。^-1  · 天^-1定义为高。使用习惯性咖啡因摄入量作为协变量进行协方差分析，以确定习惯性咖啡因摄入量是否对咖啡摄入的增效作用有影响。16 名参与者被归类为高咖啡因使用者，30 人被归类为低咖啡因使用者。摄入含咖啡因的咖啡将 5 公里自行车计时赛的表现提高了 8 ± 12 秒；95% 置信区间 (CI) [5, 13]；p  < .001; d  = 0.30，低，9±14 s；95% CI [3, 14]; p =  .002; d  = 0.18，高，8 ± 10 s；95% CI [-1, 17]；p  = .008; d  = 0.06，用户改善幅度相似，95% CI [-12, 12]；p  = .946;d  = 0.08。总之，在 5 公里的自行车计时赛之前，习惯性的咖啡因摄入不会影响摄入咖啡的机能性。