On the Fatigue-Reducing Effects of Green Tea

VernacularTitle:緑茶の疲労回復効果
Author: Eri WATANABE ; Mari KIMURA ; Jiro IMANISHI
Publication Type:Journal Article
Keywords: green tea; fatigue; natural killer activity; p300; autonomic nervous system
From:Japanese Journal of Complementary and Alternative Medicine 2013;10(1):9-16
CountryJapan
Language:Japanese
Abstract: Objective: On the psychological, physiological and immunological parameters, the effects of green tea drink were comprehensively investigated.
Design: This study used a randomized cross-over design.
Methods: After a 120-minute computer fatigue task, participants were randomized into two groups: one tasked to drink green tea and the other water. Blood collection, measurement of the P300 event related potential and questionnaire were executed three times: before and after the computer fatigue task and then, 30 minute after drinking green tea or water. These data were then compared. High Frequency (HF) and average Low Frequency/High Frequency Ratio (LF/HF) were calculated.
Result: In a state of fatigue, drinking green tea showed dominance of the parasympathetic nervous system, an improvement in their attentiveness, and elevation of NK activity; thereby, reducing fatigue, particularly, mental fatigue.
Conclusion: This study comprehensively showed the fatigue-reducing eggect of green tea in psychological, physiological and immunological parameters. It is hereby, suggested that green tea is indeed, helpful in reducing fatigue.