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  • Effect of Combined β-Alanine and SodiumBicarbonate Supplementation on Cycling Performance

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    BellingerPUB3068.pdf (759.9Kb)
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    Accepted Manuscript (AM)
    Author(s)
    Bellinger, Phillip M.
    Howe, Samuel T.
    Shing, Cecilia M.
    Fell, James W.
    Griffith University Author(s)
    Bellinger, Phil M.
    Year published
    2012
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    Abstract
    Purpose: The purpose of this study was to investigate the effects of 28 d of β-alanine supplementation on 4-min cycling time trial performance and to determine whether there was an additive effect of combined β-alanine and sodium bicarbonate (NaHCO3) supplementation on high-intensity cycling performance. Methods: Fourteen highly trained cyclists (mean ± SD: age = 25.4 ± 7.2 yr, mass = 71.1 ± 7.1 kg, V˙O2max = 66.6 ± 5.7 mL·kg−1·min−1) supplemented for 28 d with β-alanine (65 mg·kg−1 body mass each day) or placebo. A maximal 4-min bout of cycling was performed before supplementation (baseline) and twice after supplementation: ...
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    Purpose: The purpose of this study was to investigate the effects of 28 d of β-alanine supplementation on 4-min cycling time trial performance and to determine whether there was an additive effect of combined β-alanine and sodium bicarbonate (NaHCO3) supplementation on high-intensity cycling performance. Methods: Fourteen highly trained cyclists (mean ± SD: age = 25.4 ± 7.2 yr, mass = 71.1 ± 7.1 kg, V˙O2max = 66.6 ± 5.7 mL·kg−1·min−1) supplemented for 28 d with β-alanine (65 mg·kg−1 body mass each day) or placebo. A maximal 4-min bout of cycling was performed before supplementation (baseline) and twice after supplementation: after ingestion of NaHCO3 (300 mg·kg−1 body mass) and ingestion of a placebo using a randomized crossover design with 2 d between trials. Blood pH and HCO3 − concentration were determined before loading (postsupplementation trials) and at pretest and posttest. Results: In the acute NaHCO3 loading trials, blood pH and HCO3 − were elevated from before loading to pretest, and the magnitude of the change in HCO3 − from pretest to posttest was significantly greater compared with the acute placebo loading trial (P < 0.001). Average power output in the 4-min cycling performance trial was increased in placebo + NaHCO3 (+3.1% ± 1.8%) and β-alanine + NaHCO3 (+3.3% ± 3.0%) compared with baseline (P < 0.05). β-alanine + placebo did not significantly improve average power output compared with baseline (+1.6% ± 1.7%, P = 0.20); however, magnitude-based inferences demonstrated that β-alanine + placebo was associated with a 37% likelihood of producing average power improvements. Conclusions: In trained cyclists, β-alanine supplementation did not significantly improve 4-min cycling performance; however, there may be a small meaningful improvement in performance. Acute NaHCO3 supplementation significantly improved 4-min cycling performance. There seemed to be a minimal additive effect of combined β-alanine and NaHCO3 supplementation.
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    Journal Title
    Medicine & Science in Sports & Exercise
    Volume
    44
    Issue
    8
    DOI
    https://doi.org/10.1249/MSS.0b013e31824cc08d
    Copyright Statement
    © 2012 LWW. This is a non-final version of an article published in final form in Medicine and Science in Sports and Exercise 44(8):1545–1551, 2012. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal link for access to the definitive, published version.
    Subject
    Sports science and exercise
    Sports science and exercise not elsewhere classified
    Medical physiology
    Publication URI
    http://hdl.handle.net/10072/374888
    Collection
    • Journal articles

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