Cognitive and psychomotor performance, mood, and pressor effects of caffeine after 4, 6 and 8 h caffeine abstinence
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Many studies have found that caffeine consumed after overnight caffeine abstinence improves cognitive performance and mood. Much less is known, however, about the effects of caffeine after shorter periods of caffeine abstinence.
The aim of this study was to measure the effects on psychomotor and cognitive performance, mood, hand steadiness, blood pressure and heart rate of caffeine administration after periods of 4, 6, and 8 h of caffeine abstinence.
Participants (n=49, 27 female) were moderate to moderate-high caffeine consumers (mean daily intake 370 mg/day). Following overnight caffeine abstinence, a ‘pre-dose’ of caffeine (1.2 mg/kg) was administered at 9 a.m., 11 a.m. or 1 p.m. The participants started a baseline battery of measurements at 4 p.m. before receiving caffeine (1.2 mg/kg) or placebo at 5 p.m. They then performed the battery of tests again, starting at 5:30 p.m. This was a double-blind, placebo-controlled, randomised study.
Performance and mood measurements confirmed a psychostimulant action of caffeine (versus placebo), but only after 8 h of caffeine abstinence. Caffeine also increased blood pressure after 8-h abstinence, whereas hand steadiness was decreased and perception of task demand was increased by caffeine after 4 h, but not after 6- and 8-h abstinence.
A second cup-of-coffee equivalent dose of caffeine only reliably affected cognitive performance and mood after an 8-h interval between doses, but not after shorter intervals (when caffeine had some adverse effects). These results show that, apart from caffeine consumption soon after waking, the daily pattern of caffeine intake of many typical caffeine consumers is not well explained by the short-term psychostimulant effects of caffeine.
KeywordsCaffeine Drug withdrawal Cognitive performance Psychomotor performance Alertness Mood Tremor Blood pressure Heart rate
This research was supported by a grant from the European Union Fifth Framework Programme (grant no. QLK1-2000-00069). The views expressed in this paper are the sole responsibility of the authors and do not necessarily reflect the views of the European Commission or its services or their future policy in this area.
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