دورية أكاديمية
Effects of caffeine on central and peripheral fatigue following closed- and open-loop cycling exercises
العنوان: | Effects of caffeine on central and peripheral fatigue following closed- and open-loop cycling exercises |
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المؤلفون: | P.G. Couto, M.D. Silva-Cavalcante, B. Mezêncio, R.A. Azevedo, R. Cruz, R. Bertuzzi, A.E. Lima-Silva, M.A.P.D. Kiss |
المصدر: | Brazilian Journal of Medical and Biological Research, Vol 55 (2022) |
بيانات النشر: | Associação Brasileira de Divulgação Científica, 2022. |
سنة النشر: | 2022 |
المجموعة: | LCC:Medicine (General) LCC:Biology (General) |
مصطلحات موضوعية: | Endurance performance, Neuromuscular fatigue, Central fatigue, Peripheral fatigue, Ergogenic aid, Medicine (General), R5-920, Biology (General), QH301-705.5 |
الوصف: | 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. |
نوع الوثيقة: | article |
وصف الملف: | electronic resource |
اللغة: | English |
تدمد: | 1414-431X 1414-431x |
Relation: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2022000100619&lng=en&tlng=en; http://www.scielo.br/pdf/bjmbr/v55/1414-431X-bjmbr-55-e11901.pdf; https://doaj.org/toc/1414-431X |
DOI: | 10.1590/1414-431x2021e11901 |
URL الوصول: | https://doaj.org/article/d647259937754d9eb307f833a23483b7 |
رقم الأكسشن: | edsdoj.647259937754d9eb307f833a23483b7 |
قاعدة البيانات: | Directory of Open Access Journals |
تدمد: | 1414431X 1414431x |
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DOI: | 10.1590/1414-431x2021e11901 |