תזונה ותוספים Effect of β-Alanine plus Sodium Bicarbonate on High-Intensity Cycling Capacity.

[Mike Bikov]

Med Sci Sports Exerc. 2011 Mar 10. [Epub ahead of print]
Effect of β-Alanine plus Sodium Bicarbonate on High-Intensity Cycling Capacity.

Sale C, Saunders B, Hudson S, Wise JA, Harris RC, Sunderland CD.

1Biomedical, Life and Health Sciences Research Centre, School of Science and Technology, Nottingham Trent University, Clifton Lane, Nottingham, NG11 8NS, UK. 2National Alternatives International, Linda Vista Drive, San Marcos, California, CA92078, U.S.A.
Abstract

PURPOSE: We examined the effect of β-alanine supplementation plus sodium bicarbonate on high-intensity cycling capacity.

METHODS: Twenty males (age 25±5y; height 1.79±0.06 m; body mass 80.0±10.3 kg) were assigned to either a placebo (P) or a β-alanine (BA, 6.4 g·d over 4 wks) group based upon powermax, completing four cycling capacity tests at 110% of powermax (CCT110%) to determine time to exhaustion (TTE) and total work done (TWD). A CCT110% was performed twice (habituation and baseline) pre-supplementation (with maltodextrin [MD]) and twice post-supplementation (with MD and with sodium bicarbonate [SB]), using a crossover design with 2 days rest between trials, creating four study conditions (PMD, PSB, BAMD, BASB). Blood lactate, bicarbonate, pH and base excess were determined at baseline, pre-exercise, immediately post-exercise and 5 minutes post-exercise. Data were analyzed using repeated measures ANOVA.

RESULTS: TTE was increased in all conditions post-supplementation (+1.6% PMD, +6.5% PSB, +12.1% BAMD, +16.2% BASB). Both BAMD and BASB resulted in significantly improved TTE compared with pre-supplementation (P≤0.01). Although further increases in TTE (4.1%) were shown in BASB compared to BAMD, these differences were not significant (P=0.74). Differences in TWD were similar to those of TTE. Blood bicarbonate concentrations were significantly (P≤0.001) elevated prior to exercise in PSB and BASB but not in PMD or BAMD. Blood lactate concentrations were significantly elevated following exercise, remaining elevated after 5 minutes of recovery (P≤0.001) and were highest in PSB and BASB.

CONCLUSIONS: Results show that BA improved high-intensity cycling capacity. However, despite a 6 s (~4%) increase in TTE with the addition of SB, this did not reach statistical significance, but magnitude-based inferences suggested a ~70% probability of a meaningful positive difference.

PMID: 21407127 [PubMed - as supplied by publisher]​

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