Abstract
The relationship between habitual coffee and tea consumption and cognitive performance was examined using data from a cross-sectional survey of a representative sample of 9003 British adults (the Health and Lifestyle Survey). Subjects completed tests of simple reaction time, choice reaction time, incidental verbal memory, and visuo-spatial reasoning, in addition to providing self-reports of usual coffee and tea intake. After controlling extensively for potential confounding variables, a dose-response trend to improved performance with higher levels of coffee consumption was observed for all four tests (P<0.001 in each case). Similar but weaker associations were found for tea consumption, which were significant for simple reaction time (P=0.02) and visuo-spatial reasoning (P=0.013). Estimated overall caffeine consumption showed a dose-response relationship to improved cognitive performance (P<0.001 for each cognitive test, after controlling for confounders). Older people appeared to be more susceptible to the performance-improving effects of caffeine than were younger. The results suggest that tolerance to the performance-enhancing effects of caffeine, if it occurs at all, is incomplete.
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References
Barone JJ, Roberts H (1984) Human consumption of caffeine. In: Dews PB (ed) Caffeine. Springer, Berlin, pp 59–73
Blanchard J, Sawers SJA (1983) Comparative pharmacokinetics of caffeine in young and elderly men. J Pharmacokinet Biopharm 11:109–126
Brezinova V (1974) Effect of caffeine on sleep: EEG study in late middle age people. Br J Clin Pharmacol 1:203–208
Clubley M, Bye CE, Henson TA, Peck AW, Riddington CJ (1979) Effects of caffeine and cyclizine alone and in combination on human performance, subjective effects and EEG activity. Br J Clin Pharmacol 7:157–163
Cox BD, Blaxter M, Buckle ALJ, Fenner NP, Golding JF, Gore M et al. (1987) The health and lifestyle survey. Preliminary report of a nationwide survey of the physical and mental health, attitudes and lifestyle of a random sample of 9003 British adults. Health Promotion Research Trust, London
Erikson GC, Hager LB, Houseworth C, Dungan J, Petros T, Beckwith BE (1985) The effects of caffeine on memory for word lists. Physiol Behav 35:47–51
Frewer LJ, Lader M (1991) The effects of caffeine on two computerised tests of attention and vigilance. Hum Psychopharmacol 6:119–128
Gilbert RM (1984) Caffeine consumption In: Spiller GA (ed) The Methylxanthine beverages and foods: chemistry, consumption and health effects. Liss, New York, pp 189–213
Goldstein A, Kaizer S (1969) Psychotropic effects of caffeine in man. III. A questionnaire survey of coffee drinking and its effects in a group of housewives. Clin Pharmacol Ther 10:477–488
Goldstein A, Kaizer S, Whitby O (1969) Psychotropic effects of caffeine in man. IV. Quantitative and qualitative differences associated with habituation to coffee. Clin Pharmacol Ther 10:489–497
Griffiths RR, Woodson PP (1988) Caffeine physical dependence: a review of human and laboratory animal studies. Psychopharmacology 94:437–451
Karacan I, Thornby JI, Anch M et al. (1977) Dose-related sleep disturbances induced by coffee and caffeine. Clin Pharmacol Ther 20:682–689
Kerr JS, Sherwood N, Hindmarch I (1991) Separate and combined effects of the social drugs on psychomotor performance. Psychopharmacology 104:113–119
Lieberman HR, Wartman RJ, Emde GG, Roberts C, Coviella ILG (1987) Effects of low doses of caffeine on human performance and mood. Psychopharmacology 92:308–312
Loke WH (1988) Effects of caffeine on mood and memory. Physiol Behav 44:367–372
Rall TW (1990) (In) Gilman AG, Rall TW, Nies AS, Taylor P (eds) The pharmacological basis of therapeutics, 8th ed. Pergamon Press, New York, pp 618–637
Scott NR, Chakraborty J, Marks V (1989) Caffeine consumption in the United Kingdom: a retrospective survey. Food Sciences and Nutrition 42F:183–191
Swift CG, Tiplady B (1988) The effects of age on the response to caffeine. Psychopharmacology 94:29–31
Walsh JK, Muelbach MJ, Humm TM, Dickins QS, Sugerman JL, Schweitzer PK (1990) Effect of caffeine on physiological sleep tendency and ability to sustain wakefulness at night. Psychopharmacology 101:271–273
Zwyghuizen-Doorenbos A, Roehrs TA, Lipschutz L, Timms V, Roth T (1990) Effects of caffeine on alertness. Psychopharmacology 100:36–39
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Jarvis, M.J. Does caffeine intake enhance absolute levels of cognitive performance?. Psychopharmacology 110, 45–52 (1993). https://doi.org/10.1007/BF02246949
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DOI: https://doi.org/10.1007/BF02246949