Effects of caffeine on neuromuscular fatigue and performance during high-intensity cycling exercise in moderate hypoxia

dc.contributor.authorSmirmaul, Bruno P. C. [UNESP]
dc.contributor.authorde Moraes, Antonio Carlos
dc.contributor.authorAngius, Luca
dc.contributor.authorMarcora, Samuele M.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)
dc.contributor.institutionUniversity of Kent at Medway
dc.date.accessioned2018-12-11T16:44:41Z
dc.date.available2018-12-11T16:44:41Z
dc.date.issued2017-01-01
dc.description.abstractPurpose: To investigate the effects of caffeine on performance, neuromuscular fatigue and perception of effort during high-intensity cycling exercise in moderate hypoxia. Methods: Seven adult male participants firstly underwent an incremental exercise test on a cycle ergometer in conditions of acute normobaric hypoxia (fraction inspired oxygen = 0.15) to establish peak power output (PPO). In the following two visits, they performed a time to exhaustion test (78 ± 3% PPO) in the same hypoxic conditions after caffeine ingestion (4 mg kg−1) and one after placebo ingestion in a double-blind, randomized, counterbalanced cross-over design. Results: Caffeine significantly improved time to exhaustion by 12%. A significant decrease in subjective fatigue was found after caffeine consumption. Perception of effort and surface electromyographic signal amplitude of the vastus lateralis were lower and heart rate was higher in the caffeine condition when compared to placebo. However, caffeine did not reduce the peripheral and central fatigue induced by high-intensity cycling exercise in moderate hypoxia. Conclusion: The caffeine-induced improvement in time to exhaustion during high-intensity cycling exercise in moderate hypoxia seems to be mediated by a reduction in perception of effort, which occurs despite no reduction in neuromuscular fatigue.en
dc.description.affiliationDepartment of Physical Education São Paulo State University (UNESP)
dc.description.affiliationFaculty of Physical Education University of Campinas (UNICAMP)
dc.description.affiliationEndurance Research Group School of Sport and Exercise Sciences University of Kent at Medway
dc.description.affiliationUnespDepartment of Physical Education São Paulo State University (UNESP)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipIdCNPq: 131724/2011-8
dc.format.extent27-38
dc.identifierhttp://dx.doi.org/10.1007/s00421-016-3496-6
dc.identifier.citationEuropean Journal of Applied Physiology, v. 117, n. 1, p. 27-38, 2017.
dc.identifier.doi10.1007/s00421-016-3496-6
dc.identifier.file2-s2.0-84995747178.pdf
dc.identifier.issn1439-6319
dc.identifier.scopus2-s2.0-84995747178
dc.identifier.urihttp://hdl.handle.net/11449/169150
dc.language.isoeng
dc.relation.ispartofEuropean Journal of Applied Physiology
dc.relation.ispartofsjr1,186
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectAltitude
dc.subjectCentral fatigue
dc.subjectExercise performance
dc.subjectPerception of effort
dc.subjectPeripheral fatigue
dc.titleEffects of caffeine on neuromuscular fatigue and performance during high-intensity cycling exercise in moderate hypoxiaen
dc.typeArtigo

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