Electrophysiological studies in healthy subjects involving caffeine

Detalhes bibliográficos
Autor(a) principal: Carvalho, Mamede
Data de Publicação: 2010
Outros Autores: Marcelino, Erica, De Mendonça, Alexandre
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/6353
Resumo: Copyright ©2012 IOS Press All rights reserved.
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spelling Electrophysiological studies in healthy subjects involving caffeineCaffeineCortical silent periodLower motor neuronMuscleTranscranial magnetic stimulationCopyright ©2012 IOS Press All rights reserved.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.IOS PressRepositório da Universidade de LisboaCarvalho, MamedeMarcelino, EricaDe Mendonça, Alexandre2012-05-21T15:51:56Z20102010-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/6353engJournal of Alzheimer’s Disease 20 (2010) S63–S691387-2877info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-08T15:48:49Zoai:repositorio.ul.pt:10451/6353Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:31:30.523796Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Electrophysiological studies in healthy subjects involving caffeine
title Electrophysiological studies in healthy subjects involving caffeine
spellingShingle Electrophysiological studies in healthy subjects involving caffeine
Carvalho, Mamede
Caffeine
Cortical silent period
Lower motor neuron
Muscle
Transcranial magnetic stimulation
title_short Electrophysiological studies in healthy subjects involving caffeine
title_full Electrophysiological studies in healthy subjects involving caffeine
title_fullStr Electrophysiological studies in healthy subjects involving caffeine
title_full_unstemmed Electrophysiological studies in healthy subjects involving caffeine
title_sort Electrophysiological studies in healthy subjects involving caffeine
author Carvalho, Mamede
author_facet Carvalho, Mamede
Marcelino, Erica
De Mendonça, Alexandre
author_role author
author2 Marcelino, Erica
De Mendonça, Alexandre
author2_role author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Carvalho, Mamede
Marcelino, Erica
De Mendonça, Alexandre
dc.subject.por.fl_str_mv Caffeine
Cortical silent period
Lower motor neuron
Muscle
Transcranial magnetic stimulation
topic Caffeine
Cortical silent period
Lower motor neuron
Muscle
Transcranial magnetic stimulation
description Copyright ©2012 IOS Press All rights reserved.
publishDate 2010
dc.date.none.fl_str_mv 2010
2010-01-01T00:00:00Z
2012-05-21T15:51:56Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10451/6353
url http://hdl.handle.net/10451/6353
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of Alzheimer’s Disease 20 (2010) S63–S69
1387-2877
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IOS Press
publisher.none.fl_str_mv IOS Press
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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