Effects of dietary caffeine on EEG, performance and mood when rested and sleep restricted

Keane, Michael; James, Jack E.

doi:10.1002/hup.987

Cited by 33 publications

(24 citation statements)

References 39 publications

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“…Other studies, however, did show increases in participants who were well-rested and not deprived of caffeine (e.g., Attwood et al, 2006;Childs and de Wit, 2006;Haskell et al, 2005;Hewlett and Smith, 2007). The lack of clear results in the Keane and James (2008) study might be related to the sleep restriction protocol they used. Keane and James did not observe changes in performance scores due to the sleep restrictions.…”

Section: Caffeine Sleepiness and Work Qualitymentioning

confidence: 70%

“…These effects last from 1 to 5 days, representing the time required for the number of adenosine receptors in the brain to revert to "normal" levels, uninfluenced by caffeine consumption. Keane and James (2008) examined the chronic effects of caffeine consumption in 15 healthy individuals (age 17-19 years). Participants alternated weekly between ingesting placebo and caffeine (1.75 mg/kg) three times daily for 4 consecutive weeks following either usual sleep or sleep restriction (40% of the usual amount).…”

Section: Caffeine Sleepiness and Work Qualitymentioning

confidence: 99%

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Effects of caffeine on sleep and cognition

Snel

Lorist

2011

Progress in Brain Research

156

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Section: Caffeine Sleepiness and Work Qualitymentioning

confidence: 70%

Section: Caffeine Sleepiness and Work Qualitymentioning

confidence: 99%

Effects of caffeine on sleep and cognition

Snel

Lorist

2011

Progress in Brain Research

156

View full text Add to dashboard Cite

“…It is possible that a direct effect on muscle fiber or lower motor neuron is relevant [5,9]. On the other hand, the central effect is large and well documented [19,[27][28][29][30][31][32][33][34]. CSP as estimated using low intensities is a sensitive method to detect the influence of caffeine on the central nervous system [18].…”

Section: Discussionmentioning

confidence: 99%

“…However, the EEG changes are not striking and are possibly influenced by acute caffeine withdrawal or ingestion [33,34].…”

Section: Cognitive Functionmentioning

confidence: 99%

Electrophysiological Studies in Healthy Subjects Involving Caffeine

Carvalho

Marcelino

2010

JAD

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Abstract. We review the electrophysiological studies concerning the effects of caffeine on muscle, lower and upper motor neuron excitability and cognition. Several different methods have been used, such as electromyography, recruitment analysis, H-reflex, transcranial magnetic stimulation (TMS), electroencephalography and event-related potentials. The positive effect of caffeine on vigilance, attention, speed of reaction, information processing and arousal is supported by a number of electrophysiological studies. The evidence in favor of an increased muscle fiber resistance is not definitive, but higher or lower motor neuron excitability can occur as a consequence of a greater excitation of the descending input from the brainstem and upper motor neurons. TMS can address the influence of caffeine on the upper motor neuron. Previous studies showed that cortico-motor threshold and intracortical excitatory and inhibitory pathways are not influenced by caffeine. Nonetheless, our results indicate that cortical silent period (CSP) is reduced in resting muscles after caffeine consumption, when stimulating the motor cortex with intensities slightly above threshold. We present new data demonstrating that this effect is also observed in fatigued muscle. We conclude that CSP can be considered a surrogate marker of the effect of caffeine in the brain, in particular of its central ergogenic effect.

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“…One reason for no behavior change after caffeine might be due to the fact that the amount of caffeine (200 mg) used in this study was not enough to cause observable behavior difference. Meanwhile, enhanced behavior after caffeine has been long claimed to be related to its withdrawal effects (45). Different from most studies mentioned above, we only included caffeine-naive subjects in this study.…”

Section: Discussionmentioning

confidence: 99%

Attention and Working Memory Task-Load Dependent Activation Increase with Deactivation Decrease after Caffeine Ingestion

Peng¹,

Zhang²,

Chang³

et al. 2017

Investig Magn Reson Imaging

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Original ArticlePurpose: Caffeine is the most widely consumed psychostimulant. It is often adopted as a tool to modulate brain activations in fMRI studies. However, its pharmaceutical effect on task-induced deactivation has not been fully examined in fMRI. Therefore, the purpose of this study was to examine the effect of caffeine on both activation and deactivation under sustained attention. Materials and Methods: Task fMRI was acquired from 26 caffeine naive healthy volunteers before and after taking caffeine pill (200 mg). Results: Statistical analysis showed an increase in cognition-load dependent task activation but a decrease in load dependent de-activation after caffeine ingestion. Increase of attention and memory task activation and its load-dependence suggest a beneficial effect of caffeine on the brain even though it has no overt behavior improvement. The reduction of deactivation by caffeine and its load-dependence indicate reduced facilitation from task-negative networks. Conclusion: Caffeine affects brain activity in a load-dependent manner accompanied by a disassociation between task-positive network and task-negative network.

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Effects of dietary caffeine on EEG, performance and mood when rested and sleep restricted

Abstract: 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.

Cited by 33 publications

References 39 publications

Effects of caffeine on sleep and cognition

Effects of caffeine on sleep and cognition

Electrophysiological Studies in Healthy Subjects Involving Caffeine

Attention and Working Memory Task-Load Dependent Activation Increase with Deactivation Decrease after Caffeine Ingestion

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