β-alanine supplementation improves isometric endurance of the knee extensor muscles
<p>Abstract</p> <p>Background</p> <p>We examined the effect of four weeks of β-alanine supplementation on isometric endurance of the knee extensors at 45% maximal voluntary isometric contraction (MVIC).</p> <p>Methods</p> <p>Thirteen males (age 2...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Taylor & Francis Group
2012-06-01
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| Series: | Journal of the International Society of Sports Nutrition |
| Subjects: | |
| Online Access: | http://www.jissn.com/content/9/1/26 |
| _version_ | 1811329747751272448 |
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| author | Sale Craig Hill Chester A Ponte James Harris Roger C |
| author_facet | Sale Craig Hill Chester A Ponte James Harris Roger C |
| author_sort | Sale Craig |
| collection | DOAJ |
| description | <p>Abstract</p> <p>Background</p> <p>We examined the effect of four weeks of β-alanine supplementation on isometric endurance of the knee extensors at 45% maximal voluntary isometric contraction (MVIC).</p> <p>Methods</p> <p>Thirteen males (age 23 ± 6 y; height 1.80 ± 0.05 m; body mass 81.0 ± 10.5 kg), matched for pre-supplementation isometric endurance, were allocated to either a placebo (n = 6) or β-alanine (n = 7; 6.4 g·d<sup>-1</sup> over 4 weeks) supplementation group. Participants completed an isometric knee extension test (IKET) to fatigue, at an intensity of 45% MVIC, before and after supplementation. In addition, two habituation tests were completed in the week prior to the pre-supplementation test and a further practice test was completed in the week prior to the post-supplementation test. MVIC force, IKET hold-time, and impulse generated were recorded.</p> <p>Results</p> <p>IKET hold-time increased by 9.7 ± 9.4 s (13.2%) and impulse by 3.7 ± 1.3 kN·s<sup>-1</sup> (13.9%) following β-alanine supplementation. These changes were significantly greater than those in the placebo group (IKET: <it>t</it><sub>(11)</sub> = 2.9, <it>p</it> ≤0.05; impulse: <it>t</it><sub>(11)</sub> = 3.1, <it>p</it> ≤ 0.05). There were no significant changes in MVIC force in either group.</p> <p>Conclusion</p> <p>Four weeks of β-alanine supplementation at 6.4 g·d<sup>-1</sup> improved endurance capacity of the knee extensors at 45% MVIC, which most likely results from improved pH regulation within the muscle cell as a result of elevated muscle carnosine levels.</p> |
| first_indexed | 2024-04-13T15:49:23Z |
| format | Article |
| id | doaj.art-0afe95a370c64370aa7dfa5d85081949 |
| institution | Directory Open Access Journal |
| issn | 1550-2783 |
| language | English |
| last_indexed | 2024-04-13T15:49:23Z |
| publishDate | 2012-06-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Journal of the International Society of Sports Nutrition |
| spelling | doaj.art-0afe95a370c64370aa7dfa5d850819492022-12-22T02:40:53ZengTaylor & Francis GroupJournal of the International Society of Sports Nutrition1550-27832012-06-01912610.1186/1550-2783-9-26β-alanine supplementation improves isometric endurance of the knee extensor musclesSale CraigHill Chester APonte JamesHarris Roger C<p>Abstract</p> <p>Background</p> <p>We examined the effect of four weeks of β-alanine supplementation on isometric endurance of the knee extensors at 45% maximal voluntary isometric contraction (MVIC).</p> <p>Methods</p> <p>Thirteen males (age 23 ± 6 y; height 1.80 ± 0.05 m; body mass 81.0 ± 10.5 kg), matched for pre-supplementation isometric endurance, were allocated to either a placebo (n = 6) or β-alanine (n = 7; 6.4 g·d<sup>-1</sup> over 4 weeks) supplementation group. Participants completed an isometric knee extension test (IKET) to fatigue, at an intensity of 45% MVIC, before and after supplementation. In addition, two habituation tests were completed in the week prior to the pre-supplementation test and a further practice test was completed in the week prior to the post-supplementation test. MVIC force, IKET hold-time, and impulse generated were recorded.</p> <p>Results</p> <p>IKET hold-time increased by 9.7 ± 9.4 s (13.2%) and impulse by 3.7 ± 1.3 kN·s<sup>-1</sup> (13.9%) following β-alanine supplementation. These changes were significantly greater than those in the placebo group (IKET: <it>t</it><sub>(11)</sub> = 2.9, <it>p</it> ≤0.05; impulse: <it>t</it><sub>(11)</sub> = 3.1, <it>p</it> ≤ 0.05). There were no significant changes in MVIC force in either group.</p> <p>Conclusion</p> <p>Four weeks of β-alanine supplementation at 6.4 g·d<sup>-1</sup> improved endurance capacity of the knee extensors at 45% MVIC, which most likely results from improved pH regulation within the muscle cell as a result of elevated muscle carnosine levels.</p>http://www.jissn.com/content/9/1/26β-alanineCarnosineIsometric enduranceIntramuscular buffering |
| spellingShingle | Sale Craig Hill Chester A Ponte James Harris Roger C β-alanine supplementation improves isometric endurance of the knee extensor muscles Journal of the International Society of Sports Nutrition β-alanine Carnosine Isometric endurance Intramuscular buffering |
| title | β-alanine supplementation improves isometric endurance of the knee extensor muscles |
| title_full | β-alanine supplementation improves isometric endurance of the knee extensor muscles |
| title_fullStr | β-alanine supplementation improves isometric endurance of the knee extensor muscles |
| title_full_unstemmed | β-alanine supplementation improves isometric endurance of the knee extensor muscles |
| title_short | β-alanine supplementation improves isometric endurance of the knee extensor muscles |
| title_sort | β alanine supplementation improves isometric endurance of the knee extensor muscles |
| topic | β-alanine Carnosine Isometric endurance Intramuscular buffering |
| url | http://www.jissn.com/content/9/1/26 |
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