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Examining the Effects of Caffeine on Isokinetic Strength, Power, and Endurance

This study examined caffeine’s effects on isokinetic strength, power, and endurance. The sample included 25 young, resistance-trained males. The participants were tested on three occasions, in a control trial (no substance ingestion) and following the ingestion of 6 mg·kg(−1) of caffeine or placebo....

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Autores principales: Grgic, Jozo, Venier, Sandro, Mikulic, Pavle
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9590023/
https://www.ncbi.nlm.nih.gov/pubmed/36278732
http://dx.doi.org/10.3390/jfmk7040071
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author Grgic, Jozo
Venier, Sandro
Mikulic, Pavle
author_facet Grgic, Jozo
Venier, Sandro
Mikulic, Pavle
author_sort Grgic, Jozo
collection PubMed
description This study examined caffeine’s effects on isokinetic strength, power, and endurance. The sample included 25 young, resistance-trained males. The participants were tested on three occasions, in a control trial (no substance ingestion) and following the ingestion of 6 mg·kg(−1) of caffeine or placebo. Exercise tests involved isokinetic knee extension and flexion using angular velocities of 60° s(−1) and 180° s(−1). Analyzed outcomes included peak torque, average power, and total work. For knee extension at an angular velocity of 60° s(−1), there were significant differences for: (1) peak torque when comparing caffeine vs. control (Hedges’ g = 0.22) and caffeine vs. placebo (g = 0.30) and (2) average power when comparing caffeine vs. control (g = 0.21) and caffeine vs. placebo (g = 0.29). For knee extension at an angular velocity of 180° s(−1), there were significant differences for: (1) peak torque when comparing caffeine vs. placebo (g = 0.26), (2) average power when comparing caffeine vs. control (g = 0.36) and caffeine vs. placebo (g = 0.43), and (3) total work when comparing caffeine vs. control (g = 0.33) and caffeine vs. placebo (g = 0.36). Caffeine was not ergogenic for knee flexors in any of the analyzed outcomes. Additionally, there was no significant difference between control and placebo. In summary, caffeine enhances the mechanical output of the knee extensors at lower and higher angular velocities, and these effects are present when compared to placebo ingestion or no substance ingestion (control).
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spelling pubmed-95900232022-10-25 Examining the Effects of Caffeine on Isokinetic Strength, Power, and Endurance Grgic, Jozo Venier, Sandro Mikulic, Pavle J Funct Morphol Kinesiol Article This study examined caffeine’s effects on isokinetic strength, power, and endurance. The sample included 25 young, resistance-trained males. The participants were tested on three occasions, in a control trial (no substance ingestion) and following the ingestion of 6 mg·kg(−1) of caffeine or placebo. Exercise tests involved isokinetic knee extension and flexion using angular velocities of 60° s(−1) and 180° s(−1). Analyzed outcomes included peak torque, average power, and total work. For knee extension at an angular velocity of 60° s(−1), there were significant differences for: (1) peak torque when comparing caffeine vs. control (Hedges’ g = 0.22) and caffeine vs. placebo (g = 0.30) and (2) average power when comparing caffeine vs. control (g = 0.21) and caffeine vs. placebo (g = 0.29). For knee extension at an angular velocity of 180° s(−1), there were significant differences for: (1) peak torque when comparing caffeine vs. placebo (g = 0.26), (2) average power when comparing caffeine vs. control (g = 0.36) and caffeine vs. placebo (g = 0.43), and (3) total work when comparing caffeine vs. control (g = 0.33) and caffeine vs. placebo (g = 0.36). Caffeine was not ergogenic for knee flexors in any of the analyzed outcomes. Additionally, there was no significant difference between control and placebo. In summary, caffeine enhances the mechanical output of the knee extensors at lower and higher angular velocities, and these effects are present when compared to placebo ingestion or no substance ingestion (control). MDPI 2022-09-21 /pmc/articles/PMC9590023/ /pubmed/36278732 http://dx.doi.org/10.3390/jfmk7040071 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Grgic, Jozo
Venier, Sandro
Mikulic, Pavle
Examining the Effects of Caffeine on Isokinetic Strength, Power, and Endurance
title Examining the Effects of Caffeine on Isokinetic Strength, Power, and Endurance
title_full Examining the Effects of Caffeine on Isokinetic Strength, Power, and Endurance
title_fullStr Examining the Effects of Caffeine on Isokinetic Strength, Power, and Endurance
title_full_unstemmed Examining the Effects of Caffeine on Isokinetic Strength, Power, and Endurance
title_short Examining the Effects of Caffeine on Isokinetic Strength, Power, and Endurance
title_sort examining the effects of caffeine on isokinetic strength, power, and endurance
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9590023/
https://www.ncbi.nlm.nih.gov/pubmed/36278732
http://dx.doi.org/10.3390/jfmk7040071
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