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Effects of caffeine on mood and performance: a study of realistic consumption.
Psychopharmacology (Berl) 2002; 164(2):188-92P

Abstract

RATIONALE

There is a vast literature on the behavioural effects of caffeine. Many of the studies have involved single administration of a large dose of caffeine that is not representative of the way in which caffeine is usually ingested. Further information is required, therefore, on the behavioural effects of realistic patterns of consumption.

OBJECTIVES

The present study aimed to determine whether a realistic drinking regime (multiple small doses - 4 x 65 mg over a 5-h period) produced the same effects as a single large dose (200 mg). The smaller doses were selected so that the amount of caffeine present in the body after 5 h would be equivalent to that found with the single dose.

METHODS

A double-blind, placebo-controlled, within-subjects experiment was, therefore, carried out. The participants (n=24) attended for four sessions. Each session started with a baseline measurement of mood and performance at 0930 hours. On two of the sessions, coffee was then consumed at 1000, 1100, 1200 and 1300 hours. In one of these sessions 65 mg caffeine was added to the de-caffeinated coffee. In the other two sessions, the participants consumed coffee at 1300 hours and 200 mg caffeine was added in one of the sessions. The volunteers completed the battery of tests again at 1500 hours.

RESULTS

The results showed that in both consumption regimes caffeine led to increased alertness and anxiety and improved performance on simple and choice reactive tasks, a cognitive vigilance task, a task requiring sustained response and a dual task involving tracking and target detection.

CONCLUSIONS

These results suggest that previous findings from studies using a large single dose may be applicable to normal patterns of caffeine consumption.

Authors+Show Affiliations

Centre for Occupational and Health Psychology, School of Psychology, Cardiff University, 63 Park Place, Cardiff CF10 1AS, UK.No affiliation info available

Pub Type(s)

Clinical Trial
Comparative Study
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

12404081

Citation

Brice, Carolyn F., and Andrew P. Smith. "Effects of Caffeine On Mood and Performance: a Study of Realistic Consumption." Psychopharmacology, vol. 164, no. 2, 2002, pp. 188-92.
Brice CF, Smith AP. Effects of caffeine on mood and performance: a study of realistic consumption. Psychopharmacology (Berl). 2002;164(2):188-92.
Brice, C. F., & Smith, A. P. (2002). Effects of caffeine on mood and performance: a study of realistic consumption. Psychopharmacology, 164(2), pp. 188-92.
Brice CF, Smith AP. Effects of Caffeine On Mood and Performance: a Study of Realistic Consumption. Psychopharmacology (Berl). 2002;164(2):188-92. PubMed PMID: 12404081.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of caffeine on mood and performance: a study of realistic consumption. AU - Brice,Carolyn F, AU - Smith,Andrew P, Y1 - 2002/09/04/ PY - 2002/01/23/received PY - 2002/06/17/accepted PY - 2002/10/31/pubmed PY - 2003/1/30/medline PY - 2002/10/31/entrez SP - 188 EP - 92 JF - Psychopharmacology JO - Psychopharmacology (Berl.) VL - 164 IS - 2 N2 - RATIONALE: There is a vast literature on the behavioural effects of caffeine. Many of the studies have involved single administration of a large dose of caffeine that is not representative of the way in which caffeine is usually ingested. Further information is required, therefore, on the behavioural effects of realistic patterns of consumption. OBJECTIVES: The present study aimed to determine whether a realistic drinking regime (multiple small doses - 4 x 65 mg over a 5-h period) produced the same effects as a single large dose (200 mg). The smaller doses were selected so that the amount of caffeine present in the body after 5 h would be equivalent to that found with the single dose. METHODS: A double-blind, placebo-controlled, within-subjects experiment was, therefore, carried out. The participants (n=24) attended for four sessions. Each session started with a baseline measurement of mood and performance at 0930 hours. On two of the sessions, coffee was then consumed at 1000, 1100, 1200 and 1300 hours. In one of these sessions 65 mg caffeine was added to the de-caffeinated coffee. In the other two sessions, the participants consumed coffee at 1300 hours and 200 mg caffeine was added in one of the sessions. The volunteers completed the battery of tests again at 1500 hours. RESULTS: The results showed that in both consumption regimes caffeine led to increased alertness and anxiety and improved performance on simple and choice reactive tasks, a cognitive vigilance task, a task requiring sustained response and a dual task involving tracking and target detection. CONCLUSIONS: These results suggest that previous findings from studies using a large single dose may be applicable to normal patterns of caffeine consumption. SN - 0033-3158 UR - https://www.unboundmedicine.com/medline/citation/12404081/Effects_of_caffeine_on_mood_and_performance:_a_study_of_realistic_consumption_ L2 - https://dx.doi.org/10.1007/s00213-002-1175-2 DB - PRIME DP - Unbound Medicine ER -