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<sup>−1</sup> of...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | Journal of Functional Morphology and Kinesiology |
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| Online Access: | https://www.mdpi.com/2411-5142/7/4/71 |
| _version_ | 1797457014102687744 |
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| author | Jozo Grgic Sandro Venier Pavle Mikulic |
| author_facet | Jozo Grgic Sandro Venier Pavle Mikulic |
| author_sort | Jozo Grgic |
| collection | DOAJ |
| 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<sup>−1</sup> of caffeine or placebo. Exercise tests involved isokinetic knee extension and flexion using angular velocities of 60° s<sup>−1</sup> and 180° s<sup>−1</sup>. Analyzed outcomes included peak torque, average power, and total work. For knee extension at an angular velocity of 60° s<sup>−1</sup>, there were significant differences for: (1) peak torque when comparing caffeine vs. control (Hedges’ <i>g</i> = 0.22) and caffeine vs. placebo (<i>g</i> = 0.30) and (2) average power when comparing caffeine vs. control (<i>g</i> = 0.21) and caffeine vs. placebo (<i>g</i> = 0.29). For knee extension at an angular velocity of 180° s<sup>−1</sup>, there were significant differences for: (1) peak torque when comparing caffeine vs. placebo (<i>g</i> = 0.26), (2) average power when comparing caffeine vs. control (<i>g</i> = 0.36) and caffeine vs. placebo (<i>g</i> = 0.43), and (3) total work when comparing caffeine vs. control (<i>g</i> = 0.33) and caffeine vs. placebo (<i>g</i> = 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). |
| first_indexed | 2024-03-09T16:15:08Z |
| format | Article |
| id | doaj.art-a991dabc09bd4dbe82e5d87c9c644caa |
| institution | Directory Open Access Journal |
| issn | 2411-5142 |
| language | English |
| last_indexed | 2024-03-09T16:15:08Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Functional Morphology and Kinesiology |
| spelling | doaj.art-a991dabc09bd4dbe82e5d87c9c644caa2023-11-24T15:51:12ZengMDPI AGJournal of Functional Morphology and Kinesiology2411-51422022-09-01747110.3390/jfmk7040071Examining the Effects of Caffeine on Isokinetic Strength, Power, and EnduranceJozo Grgic0Sandro Venier1Pavle Mikulic2Institute for Health and Sport, Victoria University, Melbourne, VIC 3011, AustraliaFaculty of Kinesiology, University of Zagreb, 10000 Zagreb, CroatiaFaculty of Kinesiology, University of Zagreb, 10000 Zagreb, CroatiaThis 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<sup>−1</sup> of caffeine or placebo. Exercise tests involved isokinetic knee extension and flexion using angular velocities of 60° s<sup>−1</sup> and 180° s<sup>−1</sup>. Analyzed outcomes included peak torque, average power, and total work. For knee extension at an angular velocity of 60° s<sup>−1</sup>, there were significant differences for: (1) peak torque when comparing caffeine vs. control (Hedges’ <i>g</i> = 0.22) and caffeine vs. placebo (<i>g</i> = 0.30) and (2) average power when comparing caffeine vs. control (<i>g</i> = 0.21) and caffeine vs. placebo (<i>g</i> = 0.29). For knee extension at an angular velocity of 180° s<sup>−1</sup>, there were significant differences for: (1) peak torque when comparing caffeine vs. placebo (<i>g</i> = 0.26), (2) average power when comparing caffeine vs. control (<i>g</i> = 0.36) and caffeine vs. placebo (<i>g</i> = 0.43), and (3) total work when comparing caffeine vs. control (<i>g</i> = 0.33) and caffeine vs. placebo (<i>g</i> = 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).https://www.mdpi.com/2411-5142/7/4/71ergogenic aidsports supplementsresistance training |
| spellingShingle | Jozo Grgic Sandro Venier Pavle Mikulic Examining the Effects of Caffeine on Isokinetic Strength, Power, and Endurance Journal of Functional Morphology and Kinesiology ergogenic aid sports supplements resistance training |
| 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 | ergogenic aid sports supplements resistance training |
| url | https://www.mdpi.com/2411-5142/7/4/71 |
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