Demura Shinichi, Yamada Takayoshi, Terasawa Naoko
Graduate School of Natural Science & Technology, Kanazawa University.
Percept Mot Skills. 2007 Dec;105(3 Pt 2):1109-16. doi: 10.2466/pms.105.4.1109-1116.
This study examined the effect of coffee ingestion on physiological responses and ratings of perceived exertion (RPE) during submaximal endurance exercises by 10 healthy young adults. Participants performed a submaximal endurance cycling exercise corresponding to 60% of maximum oxygen uptake capacity for 60 min. They drank either caffeinated coffee with a caffeine content of 6 mg/kg body-mass of each participant (Caf) or a decaffeinated coffee (Dec) 60 min. before starting exercise. Participants participated in the blind design experiment under both conditions at a one-week interval. Oxygen uptake, respiratory exchange ratio, heart rate, RPE, and plasma lactate concentration were measured during the endurance exercise. The RPE under the Caffeinated coffee condition during the last 60 min. of endurance exercise was significantly lower than that in the Decaffeinated coffee condition. However, no significant differences in any physiological response were observed between conditions. Thus, caffeine ingestion 60 min. before starting exercise had an insignificant effect on the physiological responses, except for RPE during submaximal endurance exercises for 60 min. Caffeine ingestion before endurance exercise of relatively low intensity may have a beneficial effect on psychological responses.
本研究考察了10名健康年轻成年人在次最大耐力运动期间摄入咖啡对生理反应及主观用力感觉（RPE）评分的影响。参与者进行了相当于最大摄氧量60%的次最大耐力自行车运动，持续60分钟。他们在开始运动前60分钟饮用了含咖啡因的咖啡，咖啡因含量为每位参与者体重6毫克/千克（Caf），或饮用了脱咖啡因咖啡（Dec）。参与者在两种条件下以一周的间隔参与双盲设计实验。在耐力运动期间测量了摄氧量、呼吸交换率、心率、RPE和血浆乳酸浓度。在耐力运动最后60分钟的含咖啡因咖啡条件下的RPE显著低于脱咖啡因咖啡条件下的RPE。然而，两种条件下在任何生理反应方面均未观察到显著差异。因此，在开始运动前60分钟摄入咖啡因对生理反应影响不显著，除了在持续60分钟的次最大耐力运动期间的RPE。在相对低强度的耐力运动前摄入咖啡因可能对心理反应有有益影响。
