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Le bicarbonate augmente l'endurance

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Le bicarbonate augmente l'endurance

Messagepar Nutrimuscle-Conseils » 24 Mar 2012 20:02

The Effect of Combined [BETA]-Alanine and NaHCO3 Supplementation on Cycling Performance
Medicine & Science in Sports & Exercise: POST ACCEPTANCE, 9 February 2012
Bellinger, Phillip M.; Howe, Samuel T.; Shing, Cecilia M.; Fell, James W.

Purpose: The purpose of this study was to investigate the effects of 28-days of [beta]-alanine supplementation on four minute cycling time trial performance and to determine if there was an additive effect of combined [beta]-alanine and sodium bicarbonate (NaHCO3) supplementation on high-intensity cycling performance.

Method: Fourteen highly-trained cyclists (mean+/-SD; age=25.4 +/- 7.2 yr; mass=71.1 +/- 7.1 kg; VO2max=66.6 +/- 5.7 mL[middle dot]kg-1[middle dot]min-1) supplemented for 28-days with [beta]-alanine (65 mg[middle dot]kg-1 body mass each day) or placebo. A maximal four minute bout of cycling was performed pre-supplementation (baseline) and twice post-supplementation: following ingestion of NaHCO3 (300 mg[middle dot]kg-1 body mass), and ingestion of a placebo using a randomized crossover design with two days between trials. Blood pH and HCO3- concentration were determined pre-loading (post-supplementation trials), pre-test and post-test.

Results: In the acute NaHCO3 loading trials blood pH and HCO3- were elevated from pre-loading to pre-test and the magnitude of the change in HCO3- from pre-test to post-test was significantly greater compared to the acute placebo loading trial (P< 0.001). Average power output in the four minute cycling performance trial was increased in placebo+NaHCO3 (+3.1% +/- 1.8%) and [beta]-alanine+NaHCO3 (+3.3% +/- 3.0%) compared to baseline (P < 0.05). [beta]-alanine+placebo did not significantly improve average power output compared to baseline (+1.6% +/- 1.7%; P = 0.20), however, magnitude based inferences demonstrated that [beta]-alanine+placebo was associated with a 37% likelihood of producing average power improvements.

Conclusions: In trained cyclists [beta]-alanine supplementation did not significantly improve four minute cycling performance; however, there may be a small meaningful improvement in performance. Acute NaHCO3 supplementation significantly improved four minute cycling performance. There appeared to be minimal additive effect of combined [beta]-alanine and NaHCO3 supplementation.
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