Epigallocatechin gallate, cerebral blood flow parameters, cognitive performance and mood in healthy humans: a double-blind, placebo-controlled, crossover investigation

Wightman, Emma, Haskell, Crystal, Forster, Joanne, Veasey, Rachel and Kennedy, David (2012) Epigallocatechin gallate, cerebral blood flow parameters, cognitive performance and mood in healthy humans: a double-blind, placebo-controlled, crossover investigation. Human Psychopharmacology: Clinical and Experimental, 27 (2). pp. 177-186. ISSN 0885-6222

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Official URL: http://dx.doi.org/10.1002/hup.1263

Abstract

Objective
The aim of the study was to assess the effects of oral ingestion of the ‘green tea’ polyphenol epigallocatechin gallate (EGCG) on cognitive performance, mood and localised cerebral blood flow (CBF) parameters in healthy human adults.

Method
In this double-blind, placebo-controlled, crossover study, 27 healthy adults received placebo and two doses (135 and 270 mg) of EGCG in counterbalanced order on separate days. Following a 45-min resting absorption period, participants performed a selection of computerised cognitive tasks that activate the frontal cortex for a further 42 min. CBF and haemodynamics, as indexed by concentration changes in oxygenated and deoxygenated haemoglobin, were assessed in the frontal cortex throughout the post-treatment period using Near-infrared spectroscopy (NIRS).

Results
During the post-dose task performance period, the administration of 135 mg EGCG resulted in reduced CBF in the frontal cortex, as indexed by significantly lower concentrations of both oxygenated and total haemoglobin, in comparison with placebo. Heart rate was significantly reduced from pre dose to post dose across all treatments. No significant differences were observed for the level of deoxygenated haemoglobin or on any of the cognitive performance/mood measures.

Conclusions
These results demonstrate that a single dose of orally administered EGCG can modulate CBF parameters in healthy humans but that this is not associated with changes in cognitive performance or mood.

Item Type: Article
Additional Information: Crystal Haskell now known as Crystal Haskell-Ramsay.
Uncontrolled Keywords: EGCG, cerebral blood flow, near-infrared spectroscopy
Subjects: B200 Pharmacology, Toxicology and Pharmacy
C800 Psychology
Department: Faculties > Health and Life Sciences > School of Life Sciences > Psychology
Depositing User: Ay Okpokam
Date Deposited: 08 Mar 2012 10:07
Last Modified: 10 May 2017 22:30
URI: http://nrl.northumbria.ac.uk/id/eprint/5653

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