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J.Health Sci., 49(6), 436-443, 2003
Anti-Stress Effect of Oolong Tea in Women Loaded with Vigil
Hiroshi Kurihara,*, a Ling Chen,b Bi-feng Zhu,b Zhao-dong He,b Hiroshi Shibata,c
Yoshinobu Kiso,c Takaharu Tanaka,c and Xin-Sheng Yaoa
aInstitute of Traditional Chinese Medicine and Natural Products, Jinan University, 601 Huangpu Main Road West, Guangzhou 510632, China, bAcademy of Traditional Chinese Medicine of Fujian Province, 282 Wusilu, Fuzhou 350003, China, and cInstitute for Health Care Science, Suntory Ltd., 1-1-1, Wakayamadai, Shimamoto-cho, Mishima-gun, Osaka 618-8503, Japan
The preventive effect of oolong tea on vigil stress was investigated in 55 Chinese women. The subjects received 4 servings of tea bag daily, the tea bags in each containing 2 g dry weight of oolong tea or barley tea, or else water, for a period of one week. The results of a questionnaire indicated that ingestion of oolong tea improved symptoms of stress such as stiffness of the shoulders, fatigue of the eyes and headaches, as well as ameliorated the stress-induced increase in the number of errors in calculation tasks compared with controls. In addition, plasma cortisol levels were significantly lower in the oolong tea group (17.84 ± 2.46 mu g/dl) than in the barley tea group (21.33 ± 6.47 mu g /dl) or water group (22.95 ± 6.98 mu g/dl). Ingestion of oolong tea significantly alleviated the vigil stress-induced increase in plasma lipid peroxide levels, which may have been related to the stress-relieving effects of caffeine or antioxidant properties of polyphenols contained in the tea. These findings suggested that oolong tea has anti-stress effect, with no adverse effects on appetite or physical fitness.
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