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 |