A glucose-caffeine 'energy drink' ameliorates subjective and performance deficits during prolonged cognitive demand

Kennedy, David and Scholey, Andrew (2004) A glucose-caffeine 'energy drink' ameliorates subjective and performance deficits during prolonged cognitive demand. Appetite, 42 (3). pp. 331-333. ISSN 0195-6663

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Official URL: http://dx.doi.org/10.1016/j.appet.2004.03.001


Effects of a combination of caffeine and glucose were assessed in two double-blind, placebo-controlled, cross-over studies during extended performance of cognitively demanding tasks. In the first study, 30 participants received two drinks containing carbohydrate and caffeine (68 g/38 mg; 68 g/46 mg, respectively) and a placebo drink, in counter-balanced order, on separate days. In the second study 26 participants received a drink containing 60 g of carbohydrate and 33 mg of caffeine and a placebo drink. In both studies, participants completed a 10-min battery of tasks comprising 2-min versions of Serial 3s and Serial 7s subtraction tasks and a 5-min version of the Rapid Visual Information Processing task (RVIP), plus a rating of 'mental fatigue', once before the drink and six times in succession commencing 10 min after its consumption. In comparison to placebo, all three active drinks improved the accuracy of RVIP performance and both the drink with the higher level of caffeine in first study and the active drink in the second study resulted in lower ratings of mental fatigue. These results indicate that a combination of caffeine and glucose can ameliorate deficits in cognitive performance and subjective fatigue during extended periods of cognitive demand.

Item Type: Article
Uncontrolled Keywords: Attention; Caffeine; Cognitive demand; Glucose; Mental fatigue
Subjects: C800 Psychology
D600 Food and Beverage studies
Department: Faculties > Health and Life Sciences > Psychology
Depositing User: Becky Skoyles
Date Deposited: 02 Feb 2015 10:45
Last Modified: 12 Oct 2019 16:27
URI: http://nrl.northumbria.ac.uk/id/eprint/19880

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