Electrophysiological studies in healthy subjects involving caffeine
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , |
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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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 |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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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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1799134204229844992 |