Cerebral blood flow and behavioural effects of caffeine in habitual and non-habitual consumers of caffeine: A near infrared spectroscopy study

Kennedy, David and Haskell, Crystal (2011) Cerebral blood flow and behavioural effects of caffeine in habitual and non-habitual consumers of caffeine: A near infrared spectroscopy study. Biological Psychology, 86 (3). pp. 298-306. ISSN 1873-6246

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Official URL: http://dx.doi.org/10.1016/j.biopsycho.2010.12.010

Abstract

Caffeine has been shown to modulate cerebral blood flow, with little evidence of tolerance to these effects following habitual use. However, previous studies have focused on caffeine levels much higher than those found in dietary servings and have compared high caffeine consumers with low consumers rather than 'non-consumers'. The current placebo-controlled double-blind, balanced-crossover study employed near infrared spectroscopy to monitor pre-frontal cerebral-haemodynamics at rest and during completion of tasks that activate the pre-frontal cortex. Twenty healthy young habitual and non-habitual consumers of caffeine received 75mg caffeine or placebo. Caffeine significantly decreased cerebral blood flow but this was subject to a significant interaction with consumption status, with no significant effect being shown in habitual consumers and an exaggerated effect in non-habitual consumers. These findings suggest that caffeine, at levels typically found in a single dietary serving, is able to modulate cerebral blood flow but these effects are subject to tolerance.

Item Type: Article
Additional Information: Crystal Haskell now known as Crystal Haskell-Ramsay.
Uncontrolled Keywords: Caffeine, cognitive, cerebral blood-flow, near infrared spectroscopy, NIRS, haemodynamics, consumers, habituation
Subjects: B900 Others in Subjects allied to Medicine
Department: Faculties > Health and Life Sciences > Psychology
Depositing User: EPrint Services
Date Deposited: 10 Mar 2011 15:03
Last Modified: 27 Oct 2017 05:27
URI: http://nrl.northumbria.ac.uk/id/eprint/2244

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