Ingestion of green tea with lowered caffeine improves sleep quality of the elderly via suppression of stress
| Autor: | Yohei Kawasaki, Kazuaki Iguchi, Shigenori Noda, Akio Morita, Hiroshi Yamada, Yoriyuki Nakamura, Keiko Unno |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
green tea Clinical Biochemistry Medicine (miscellaneous) Physiology 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Ingestion Medicine sleep Morning Sleep Stages Nutrition and Dietetics elderly people Sleep quality business.industry food and beverages salivary α-amylase Theanine Green tea Sleep in non-human animals theanine 030104 developmental biology chemistry Original Article business Caffeine 030217 neurology & neurosurgery |
| Zdroj: | Journal of Clinical Biochemistry and Nutrition |
| ISSN: | 1880-5086 0912-0009 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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