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Effects of caffeine on central and peripheral fatigue following closed- and open-loop cycling exercises

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dc.contributor.author Couto, P. G.
dc.contributor.author Silva-Cavalcante, M. D.
dc.contributor.author Mezêncio, B.
dc.contributor.author Azevedo, R. A.
dc.contributor.author Cruz, R.
dc.contributor.author Bertuzzi, R.
dc.contributor.author Lima-Silva, A. E.
dc.contributor.author Kiss, M. A. P. D.
dc.date.accessioned 2024-08-13T00:41:52Z
dc.date.available 2024-08-13T00:41:52Z
dc.date.issued 2022-02-28
dc.identifier.citation COUTO, P.G. et al. Effects of caffeine on central and peripheral fatigue following closed- and open-loop cycling exercises. Brazilian Journal of Medical and Biological Research, Ribeirão Preto, v. 55, e11901, 28 feb. 2022. pt_BR
dc.identifier.issn 1414-431X
dc.identifier.uri https://doi.org/10.1590/1414-431X2021e11901 pt_BR
dc.identifier.uri http://www.sbicafe.ufv.br/handle/123456789/14533
dc.description.abstract We examined whether endurance performance and neuromuscular fatigue would be affected by caffeine ingestion during closed- and open-loop exercises. Nine cyclists performed a closed-loop (4,000-m cycling time trial) and an open-loop exercise (work rate fixed at mean power of the closed-loop trial) 60 min after ingesting caffeine (CAF, 5 mg/kg) or placebo (PLA, cellulose). Central and peripheral fatigue was quantified via pre- to post-exercise decrease in quadriceps voluntary activation and potentiated twitch force, respectively. Test sensitivity for detecting caffeine-induced improvements in exercise performance was calculated as the mean change in time divided by the error of measurement. Caffeine ingestion reduced the time of the closed-loop trial (PLA: 375.1±14.5 s vs CAF: 368.2±14.9 s, P=0.024) and increased exercise tolerance during the open-loop trial (PLA: 418.2±99.5 s vs CAF: 552.5±106.5 s, P=0.001), with similar calculated sensitivity indices (1.5, 90%CI: 0.7-2.9 vs 2.8, 90%CI: 1.9-5.1). The reduction in voluntary activation was more pronounced (P=0.019) in open- (-6.8±8.3%) than in closed-loop exercises (-1.9±4.4%), but there was no difference between open- and closed-loop exercises for the potentiated twitch force reduction (-25.6±12.8 vs -26.6±12.0%, P>0.05). Caffeine had no effect on central and peripheral fatigue development in either mode of exercise. In conclusion, caffeine improved endurance performance in both modes of exercise without influence on post-exercise central and peripheral fatigue, with the open-loop exercise imposing a greater challenge to central fatigue tolerance. pt_BR
dc.format pdf pt_BR
dc.language.iso en pt_BR
dc.publisher Associação Brasileira de Divulgação Científica pt_BR
dc.relation.ispartofseries Brazilian Journal of Medical and Biological Research;v. 55, e11901, 2022;
dc.rights Open access pt_BR
dc.rights.uri Open Access pt_BR
dc.subject Endurance performance; pt_BR
dc.subject Neuromuscular fatigue pt_BR
dc.subject Central fatigue pt_BR
dc.subject Peripheral fatigue pt_BR
dc.subject Ergogenic aid pt_BR
dc.subject.classification Cafeicultura::Café e saúde pt_BR
dc.title Effects of caffeine on central and peripheral fatigue following closed- and open-loop cycling exercises pt_BR
dc.type Artigo pt_BR

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