Acute effects of tea constituents L-theanine, caffeine, and epigallocatechin gallate on cognitive function and mood: a systematic review and meta-analysis
Camfield DA, Stough C, Farrimond J, Scholey AB
Nutrition reviews · 96 citas
Cómo se estudió
- Diseño
- Metaanálisis (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación independiente
- Universidad u hospital
- University of Bristol
Según 1 financiador declarado.
Publicación
- Publicado
- 2014-06-19 · Nutr Rev · vol. 72 · número 8 · págs. 507–522
- Editorial
- Oxford University Press
- Citado
- 140 citas · más que el 79% de estudios similares · 1.5× el promedio de su campo
- Referencias
- 42 trabajos
- Acceso
- De pago
- Áreas de investigación
- Tea Polyphenols and Effects · Coffee research and impacts · Medicinal Plant Extracts Effects
- Palabras clave
- theanine, caffeine, epigallocatechin gallate, tea constituents, mood, alertness, state anxiety, attentional shift, rapid visual information processing, caffeine dose
- MeSH
- humans, camellia sinensis, catechin, caffeine, glutamates, plant extracts, affect, cognition, attention, tea
4 autores
- David Camfield🇦🇺Swinburne University of Technology
- Con K. K. Stough🇦🇺Swinburne University of Technology
- Jonathon Farrimond🇬🇧GlaxoSmithKline (United Kingdom)
- Andrew B Scholey🇦🇺 · autor de correspondenciaSwinburne University of Technology
Resumen
El texto original del estudio, en el idioma en que se publicó.
A systematic review and meta-analysis was conducted on 11 randomized placebo-controlled human studies of acute effects of tea constituents L-theanine and epigallocatechin gallate, administered alone or in combination with caffeine, on cognitive function and mood. The outcome measures of mood were alertness, calmness, and contentedness, derived from the Bond-Lader scales, and state anxiety, from the State-Trait Anxiety Inventory. Cognitive measures assessed were attentional switch, intersensory attention, and rapid visual information processing. Standardized mean differences between placebo and treatment groups are presented for each study and outcome measure. Meta-analysis using a random-effects model was conducted when data were available for three or more studies. Evidence of moderate effect sizes in favor of combined caffeine and L-theanine in the first 2 hours postdose were found for outcome measures Bond-Lader alertness, attentional switching accuracy, and, to a lesser extent, some unisensory and multisensory attentional outcomes. Moderator analysis of caffeine and L-theanine doses revealed trends toward greater change in effect size for caffeine dose than for L-theanine dose, particularly during the first hour postdose.
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