Tea is a beverage commonly consumed worldwide. Matcha is a type of green tea produced by drying and grinding tea leaves (Camellia sinensis L.) into a fine powder. Matcha contains catechin, theanine, and caffeine, which affect cognitive function. Epidemiological studies conducted in Japan have shown that green tea consumption improves cognitive impairment. Previously, we found that daily matcha intake improves attention and executive function in middle-aged and older people. However, its effect on cognitive function in younger adults remains unclear. Moreover, it is unclear which cognitive functions are impaired by stress. This study aimed to clarify whether the administration of matcha improves the attentional function of young adults after mild acute stress and which cognitive function is improved. We included 42 participants aged 25 to 34 years who consumed 2 g of matcha daily for 2 weeks. The Uchida–Kraepelin test was used to induce mild acute psychological stress. Memory, attention, facial expression recognition, working memory, visual information, and motor function were evaluated. Reaction times on the Stroop test for attentional function were significantly lower in the matcha group than in the placebo group. Correct hits in the emotion perception test increased significantly for participants in the matcha group compared to those in the placebo group. We found no significant between-group differences in the other tests. In conclusion, after 2 weeks of matcha intake, the attentional function was maintained after mild acute psychological stress. Thus, matcha might improve cognitive function during or after stress conditions in young adults.

茶是一种全世界普遍饮用的饮料。抹茶是一种通过干燥和研磨茶叶（Camellia sinensis）制成的绿茶。L.) 磨成细粉。抹茶含有儿茶素、茶氨酸和咖啡因，会影响认知功能。在日本进行的流行病学研究表明，饮用绿茶可以改善认知障碍。此前，我们发现每天摄入抹茶可以提高中老年人的注意力和执行功能。然而，其对年轻人认知功能的影响尚不清楚。此外，尚不清楚压力会损害哪些认知功能。本研究旨在阐明抹茶是否能改善年轻人在轻度急性应激后的注意力功能，以及哪些认知功能得到改善。我们纳入了 42 名年龄在 25 至 34 岁之间的参与者，他们每天摄入 2 克抹茶，持续 2 周。Uchida-Kraepelin 测试用于诱发轻度急性心理压力。记忆，评估注意力、面部表情识别、工作记忆、视觉信息和运动功能。抹茶组的注意力功能 Stroop 测试的反应时间显着低于安慰剂组。与安慰剂组相比，抹茶组参与者在情绪感知测试中的正确命中率显着增加。我们在其他测试中没有发现显着的组间差异。总之，摄入抹茶2周后，轻度急性心理应激后注意力功能得以维持。因此，抹茶可能会改善年轻人在压力状况期间或之后的认知功能。抹茶组注意力功能 Stroop 测试的反应时间显着低于安慰剂组。与安慰剂组相比，抹茶组参与者在情绪感知测试中的正确命中率显着增加。我们在其他测试中没有发现显着的组间差异。总之，摄入抹茶2周后，轻度急性心理应激后注意力功能得以维持。因此，抹茶可能会改善年轻人在压力状况期间或之后的认知功能。抹茶组的注意力功能 Stroop 测试的反应时间显着低于安慰剂组。与安慰剂组相比，抹茶组参与者在情绪感知测试中的正确命中率显着增加。我们在其他测试中没有发现显着的组间差异。总之，摄入抹茶2周后，轻度急性心理应激后注意力功能得以维持。因此，抹茶可能会改善年轻人在压力状况期间或之后的认知功能。抹茶摄入2周后，在轻度急性心理应激后注意力功能得以维持。因此，抹茶可能会改善年轻人在压力状况期间或之后的认知功能。抹茶摄入2周后，在轻度急性心理应激后注意力功能得以维持。因此，抹茶可能会改善年轻人在压力状况期间或之后的认知功能。