Financiado en parte por Unilever, Mars Petcare
Time for tea: mood, blood pressure and cognitive performance effects of caffeine and theanine administered alone and together
Rogers PJ, Smith JE, Heatherley SV, Pleydell-Pearce CW
Psychopharmacology · 111 citas
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Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiado por la industria
- Empresa
- Unilever
- Empresa
- Mars Petcare
Según 2 financiadores declarados.
Publicación
- Publicado
- 2007-09-22 · Psychopharmacology (Berl) · vol. 195 · número 4 · págs. 569–577
- Editorial
- Springer Science+Business Media
- Citado
- 180 citas · más que el 94% de estudios similares · 4.3× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 63 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Tea Polyphenols and Effects · Medicinal Plant Extracts Effects
- Palabras clave
- caffeine, theanine, tea, blood pressure, mood, anxiety, alertness, jitteriness, cognitive performance, reaction time, visual probe task, hypertension
- MeSH
- humans, caffeine, glutamates, facial expression, double-blind method, affect, cognition, discrimination learning, pattern recognition, visual, arousal, attention, blood pressure, heart rate, tea, adult, female, male
4 autores
- Peter J. Rogers🇬🇧 · autor de correspondenciaUniversity of Bristol
- Jessica E. Smith🇬🇧University of Bristol
- Susan V. Heatherley🇬🇧University of Bristol
- Christopher W. Pleydell-Pearce🇬🇧University of Bristol
Resumen
El texto original del estudio, en el idioma en que se publicó.
Rationale
Although both contain behaviourally significant concentrations of caffeine, tea is commonly perceived to be a less stimulating drink than coffee. At least part of the explanation for this may be that theanine, which is present in tea but not coffee, has relaxing effects. There is also some evidence that theanine affects cognitive performance, and it has been found to reduce blood pressure in hypertensive rats.
Objectives
To study the subjective, behavioural and blood pressure effects of theanine and caffeine administered alone and together, in doses relevant to the daily tea consumption of regular tea drinkers.
Materials and methods
In a randomised, double-blind, placebo-controlled study, healthy adult participants (n = 48) received either 250-mg caffeine, 200-mg theanine, both or neither of these. They completed ratings of mood, including anxiety, and alertness, and had their blood pressure measured before and starting 40 min after drug administration. Anxiety was also assessed using a visual probe task.
Results
Caffeine increased self-rated alertness and jitteriness and blood pressure. Theanine antagonised the effect of caffeine on blood pressure but did not significantly affect jitteriness, alertness or other aspects of mood. Theanine also slowed overall reaction time on the visual probe task.
Conclusions
Theanine is a physiologically and behaviourally active compound and, while it is unclear how its effects might explain perceived differences between tea and coffee, evidence suggests that it may be useful for reducing raised blood pressure.
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