Ingestion of green tea with lowered caffeine improves sleep quality of the elderly via suppression of stress

• Unno Keiko

  Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka Tea Science Center, Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka

• Noda Shigenori

  Division of Drug Evaluation & Informatics, School of Pharmaceutical Sciences, University of Shizuoka

• Kawasaki Yohei

  Division of Drug Evaluation & Informatics, School of Pharmaceutical Sciences, University of Shizuoka

• Yamada Hiroshi

  Division of Drug Evaluation & Informatics, School of Pharmaceutical Sciences, University of Shizuoka

• Morita Akio

  Department of Functional Plant Physiology, Faculty of Agriculture, Shizuoka University

• Iguchi Kazuaki

  Department of Neurophysiology, School of Pharmaceutical Sciences, University of Shizuoka

• Nakamura Yoriyuki

  Tea Science Center, Graduate Division of Nutritional and Environmental Sciences, University of Shizuoka

抄録

Epidemiological and animal studies have demonstrated that ingestion of green tea enhances healthy life. However, caffeine in green tea can interfere with sleep. In this report, we examined the effect of green tea with lowered caffeine, low-caffeine green tea, on stress and sleep of the elderly. The participants (n = 10, mean age 89.3 ± 4.2 years) drank five cups/day of standard green tea for 1 week. Subsequently, they drank five cups/day of low-caffeine green tea for 2 weeks. Salivary α-amylase activity (sAA) was measured as a stress marker. Sleep stages were measured using a portable electroencephalography (n = 7, 6 female and 1 male). The level of sAA in the morning (sAAm) was significantly lower when the participants drank low-caffeine green tea than standard green tea. While the levels of sAAm were different among individuals, lower sAAm correlated with a higher quality of sleep. In those participants whose sAAm was lowered by the ingestion of low-caffeine green tea, some sleep parameters improved. Daily ingestion of low-caffeine green tea may be a beneficial tool for improving the quality of sleep of the elderly via the suppression of stress, although further research is required to fortify this hypothesis.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　Ｃｌｉｎｉｃａｌ　Ｂｉｏｃｈｅｍｉｓｔｒｙ　ａｎｄ　Ｎｕｔｒｉｔｉｏｎ

  Ｊｏｕｒｎａｌ　ｏｆ　Ｃｌｉｎｉｃａｌ　Ｂｉｏｃｈｅｍｉｓｔｒｙ　ａｎｄ　Ｎｕｔｒｉｔｉｏｎ 61 (3), 210-216, 2017

  一般社団法人　日本酸化ストレス学会

キーワード

• elderly people
• sleep
• green tea
• theanine
• salivary α-amylase

詳細情報

• CRID: 1390001204673448064
• NII論文ID: 130006191920
• DOI: 10.3164/jcbn.17-6
• ISSN: 18805086
• ISSN: 09120009
• Web Site: https://www.jstage.jst.go.jp/article/jcbn/61/3/61_17-6/_pdf
• Web Site: https://search.jamas.or.jp/link/ui/2018148537
• 本文言語コード: en
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