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Effects of dietary caffeine on EEG, performance and mood when rested and sleep restricted.
Hum Psychopharmacol. 2008 Dec; 23(8):669-80.HP

Abstract

RATIONALE

Until recently, little account had been taken of the confounding effects of caffeine withdrawal and withdrawal reversal when examining the net effects of dietary caffeine.

OBJECTIVES

By including a manipulation involving sleep restriction, the present study aimed to extend recent findings from research in which caffeine withdrawal and withdrawal reversal were controlled. The main aims of the study were to examine the net effects of caffeine, as well as its potential restorative effects following sleep restriction, on EEG, performance and mood.

METHOD

A randomised cross-over design was used in which 15 participants alternated weekly between ingesting placebo and caffeine (1.75 mg/kg) three times daily for four consecutive weeks following either usual sleep or sleep restriction. EEG activity was measured at 32 sites during eyes closed, eyes open and performance of a vigilance task.

RESULTS

Modest effects of caffeine were found in the delta and beta bandwidths, but no main effects of caffeine were observed in the theta or alpha bandwidths. Overall, the effects of caffeine on EEG activity were relatively few, weak and inconsistent, and no evidence was found of net restorative effects of caffeine for any outcome variables.

CONCLUSIONS

The findings do not support the use of caffeine as a means for enhancing human function or as an antidote to the negative effects of sleep loss.

Authors+Show Affiliations

School of Psychology, National University of Ireland, Galway, Ireland.No affiliation info available

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

18980263

Citation

Keane, Michael A., and Jack E. James. "Effects of Dietary Caffeine On EEG, Performance and Mood when Rested and Sleep Restricted." Human Psychopharmacology, vol. 23, no. 8, 2008, pp. 669-80.
Keane MA, James JE. Effects of dietary caffeine on EEG, performance and mood when rested and sleep restricted. Hum Psychopharmacol. 2008;23(8):669-80.
Keane, M. A., & James, J. E. (2008). Effects of dietary caffeine on EEG, performance and mood when rested and sleep restricted. Human Psychopharmacology, 23(8), 669-80. https://doi.org/10.1002/hup.987
Keane MA, James JE. Effects of Dietary Caffeine On EEG, Performance and Mood when Rested and Sleep Restricted. Hum Psychopharmacol. 2008;23(8):669-80. PubMed PMID: 18980263.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effects of dietary caffeine on EEG, performance and mood when rested and sleep restricted. AU - Keane,Michael A, AU - James,Jack E, PY - 2008/11/5/pubmed PY - 2009/2/28/medline PY - 2008/11/5/entrez SP - 669 EP - 80 JF - Human psychopharmacology JO - Hum Psychopharmacol VL - 23 IS - 8 N2 - RATIONALE: Until recently, little account had been taken of the confounding effects of caffeine withdrawal and withdrawal reversal when examining the net effects of dietary caffeine. OBJECTIVES: By including a manipulation involving sleep restriction, the present study aimed to extend recent findings from research in which caffeine withdrawal and withdrawal reversal were controlled. The main aims of the study were to examine the net effects of caffeine, as well as its potential restorative effects following sleep restriction, on EEG, performance and mood. METHOD: A randomised cross-over design was used in which 15 participants alternated weekly between ingesting placebo and caffeine (1.75 mg/kg) three times daily for four consecutive weeks following either usual sleep or sleep restriction. EEG activity was measured at 32 sites during eyes closed, eyes open and performance of a vigilance task. RESULTS: Modest effects of caffeine were found in the delta and beta bandwidths, but no main effects of caffeine were observed in the theta or alpha bandwidths. Overall, the effects of caffeine on EEG activity were relatively few, weak and inconsistent, and no evidence was found of net restorative effects of caffeine for any outcome variables. CONCLUSIONS: The findings do not support the use of caffeine as a means for enhancing human function or as an antidote to the negative effects of sleep loss. SN - 1099-1077 UR - https://www.unboundmedicine.com/medline/citation/18980263/Effects_of_dietary_caffeine_on_EEG_performance_and_mood_when_rested_and_sleep_restricted_ L2 - https://doi.org/10.1002/hup.987 DB - PRIME DP - Unbound Medicine ER -