Central Research Institute, ITO EN, Ltd., 21 Mekami, Shizuoka, Makinohara 421-0516, Japan.
Tokyo Skytree Station Medical Clinic, Ryobi Building F4 33-13, Mukojima 3-chome, Sumida-ku, Tokyo 131-0033, Japan.
Nutrients. 2021 May 17;13(5):1700. doi: 10.3390/nu13051700.
Matcha, a type of green tea, has a higher amino acid content than other types of tea. We previously examined the ability of matcha to improve cognitive function in older adults and determined that continuous matcha intake improves attention and executive function. This study aimed to compare the effects of matcha and caffeine and clarify the differences between these effects. The study was registered at the University Hospital Medical Information Network (UMIN000036578). The effect of single and continuous intake was compared, and the usefulness of continuous intake was evaluated under the stress condition. The Uchida-Kraepelin test (UKT) was used to induce mild acute stress, and the Cognitrax was used to evaluate cognitive function. A single dose of caffeine improved attentional function during or after stress loading. The reduced reaction time in the Cognitrax, observed following a single dose of matcha, was likely due to caffeine. The matcha group showed an increase in the amount of work after continuous intake, whereas the caffeine group only showed an increase in the amount of work for the UKT after a single dose. Ingesting matcha with caffeine improves both attention and work performance when suffering from psychological stress compared with caffeine alone.
抹茶是一种绿茶，其氨基酸含量高于其他类型的茶。我们之前研究了抹茶改善老年人认知功能的能力，发现连续摄入抹茶可以改善注意力和执行功能。本研究旨在比较抹茶和咖啡因的作用，并阐明这些作用的区别。本研究在大学医院医学信息网络（UMIN000036578）注册。比较了单次和连续摄入的效果，并在应激条件下评估了连续摄入的有用性。使用 Uchida-Kraepelin 测试（UKT）诱导轻度急性应激，使用 Cognitrax 评估认知功能。单次摄入咖啡因可改善应激负荷期间或之后的注意力功能。单次摄入抹茶后，Cognitrax 观察到的反应时间缩短可能是由于咖啡因。连续摄入抹茶后，抹茶组的工作量增加，而单次摄入咖啡因后，只有 UKT 的工作量增加。与单独摄入咖啡因相比，摄入含有咖啡因的抹茶可改善心理应激时的注意力和工作表现。
