Effects of L-theanine or caffeine intake on changes in blood pressure under physical and psychological stresses
Yoto A, Motoki M, Murao S, Yokogoshi H
Journal of physiological anthropology · 64 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
Según 1 financiador declarado y la declaración de financiación del texto completo.
Publicación
- Publicado
- 2012-10-29 · J Physiol Anthropol · vol. 31 · número 1 · pág. 28
- Editorial
- BioMed Central
- Citado
- 109 citas · más que el 92% de estudios similares · 3.3× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 21 trabajos
- Acceso
- Acceso abierto (revista) · CC-BY
- Áreas de investigación
- Coffee research and impacts · Tea Polyphenols and Effects · Blood Pressure and Hypertension Studies
- Palabras clave
- theanine, caffeine, blood pressure, stress response, cognitive task performance, anxiety, Profile of Mood States, glutamate receptor antagonism, green tea
- MeSH
- humans, caffeine, glutamates, severity of illness index, analysis of variance, cross-over studies, stress, psychological, affect, task performance and analysis, skin temperature, blood pressure, female, male, stress, physiological, young adult
4 autores
- Ai Yoto🇯🇵 · autor de correspondenciaShizuoka University; University of Shizuoka
- Mao Motoki🇯🇵Shizuoka University; University of Shizuoka
- Sato Murao🇯🇵Shizuoka University; University of Shizuoka
- Hidehiko Yokogoshi🇯🇵Shizuoka University; University of Shizuoka
Resumen
El texto original del estudio, en el idioma en que se publicó.
Background
L-theanine, an amino acid contained in green tea leaves, is known to block the binding of L-glutamic acid to glutamate receptors in the brain, and has been considered to cause anti-stress effects by inhibiting cortical neuron excitation. Both L-theanine and caffeine, which green tea contains, have been highlighted for their beneficial effects on cognition and mood.
Methods
In this study, we investigated the effects of orally administered L-theanine or caffeine on mental task performance and physiological activities under conditions of physical or psychological stress in humans. Fourteen participants each underwent three separate trials, in which they orally took either L-theanine + placebo, caffeine + placebo, or placebo only.
Results
The results after the mental tasks showed that L-theanine significantly inhibited the blood-pressure increases in a high-response group, which consisted of participants whose blood pressure increased more than average by a performance of a mental task after placebo intake. Caffeine tended to have a similar but smaller inhibition of the blood-pressure increases caused by the mental tasks. The result of the Profile of Mood States after the mental tasks also showed that L-theanine reduced the Tension-Anxiety scores as compared with placebo intake.
Conclusions
The findings above denote that L-theanine not only reduces anxiety but also attenuates the blood-pressure increase in high-stress-response adults.
Resumen vía Europe PMC. Los derechos de autor siguen siendo de los autores o la editorial (CC BY).
Confianza de la comunidad
Cargando…
¿Cuánto confías en los hallazgos de este estudio?
Comentarios
¿Algo está mal aquí?
Señala este estudio si su información, etiquetas o financiación parecen incorrectas. Un editor revisa cada señalamiento.
Información educativa sobre investigación publicada. No es consejo médico ni una recomendación para empezar o dejar nada.