Reduced Stress and Improved Sleep Quality Caused by Green Tea Are Associated with a Reduced Caffeine Content
Unno K, Noda S, Kawasaki Y, Yamada H, Morita A, Iguchi K, Nakamura Y
Nutrients · 51 citas
Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación independiente
- Gobierno
- Japan Society for the Promotion of Science
- Gobierno
- Grant-in-Aid for Scientific Research
- Universidad u hospital
- a grant for specially promoted research of the University of Shizuoka
- Subvenciones
- Japan Society for the Promotion of Science (15K00828)
Según 3 financiadores declarados y la declaración de financiación del texto completo.
Publicación
- Publicado
- 2017-07-19 · Nutrients · vol. 9 · número 7 · pág. 777
- Editorial
- Multidisciplinary Digital Publishing Institute
- Citado
- 65 citas · más que el 90% de estudios similares · 2.6× el promedio de su campo
- Referencias
- 36 trabajos
- Acceso
- Acceso abierto (revista) · CC-BY
- Áreas de investigación
- Tea Polyphenols and Effects · Tryptophan and brain disorders · Nutritional Studies and Diet
- Palabras clave
- Caffeine, Sleep quality, Sleep (system call), Green tea, Medicine, Food science, Chemistry, Pharmacology, Endocrinology, Insomnia, Computer science
- MeSH
- humans, catechin, caffeine, glutamates, cross-over studies, double-blind method, stress, psychological, sleep, tea, adult, middle aged, female, male, alpha-amylases
7 autores
- Keiko Unno🇯🇵 · autor de correspondenciaUniversity of Shizuoka
- Shigenori Noda🇯🇵University of Shizuoka
- Yohei Kawasaki🇯🇵University of Shizuoka
- Hiroshi Yamada🇯🇵University of Shizuoka
- Akio Morita🇯🇵Shizuoka University
- Kazuaki Iguchi🇯🇵University of Shizuoka
- Yoriyuki Nakamura🇯🇵University of Shizuoka
Resumen
El texto original del estudio, en el idioma en que se publicó.
Caffeine, one of the main components in green tea, can interfere with sleep and block the effect of theanine. Since theanine, the main amino acid in tea leaves, has significant anti-stress effects in animals and humans, we examined the effects of green tea with lowered caffeine content, i.e., low-caffeine green tea (LCGT), on stress and quality of sleep of middle-aged individuals (n = 20, mean age 51.3 ± 6.7 years) in a double-blind crossover design. Standard green tea (SGT) was used as the control. These teas (≥300 mL/day), which were eluted with room temperature water, were consumed over a period of seven days after a single washout term. The level of salivary α-amylase activity (sAA), a stress marker, was significantly lower in participants that consumed LCGT (64.7 U/mL) than in those that consumed SGT (73.9 U/mL). Sleep quality was higher in participants that consumed a larger quantity of LCGT. In addition, a self-diagnostic check for accumulated fatigue was significantly lower in those participants that consumed LCGT than SGT. These results indicate that LCGT intake can reduce stress in middle-aged individuals and improve their quality of sleep. The reduction in caffeine is suggested to be a valid reason for enhancing the anti-stress effect of green tea.
Resumen vía Europe PMC. Los derechos de autor siguen siendo de los autores o la editorial (CC BY).
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